JP2011215850A - Pressure adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily automatically change and set a setting pressure of a pressure control valve while reducing cost by adding a configuration for automatically rotationally driving a pressure adjustment screw.SOLUTION: This pressure adjustment device includes a closing member freely installable to a casing, is formed with a storage space 61 storing a pressure setting spring 9 by the closing member and the casing in a state in which the closing member is installed to the casing, and extending in an expansion/contraction direction of the pressure setting spring 9, and includes a rotary drive shaft penetrating the closing member toward the storage space in an attitude along the expansion/contraction direction and a drive part rotationally driving the rotary drive shaft. The pressure adjustment screw supports one end of the pressure setting spring 9, and is disposed inside the storage space 61 movably along the expansion/contraction direction by the rotational driving of the rotary drive shaft by the drive part.

Description

  The present invention is provided with a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure, and a pressure setting unit that changes and sets the set pressure of the pressure control valve, and the pressure setting unit includes a spring The present invention relates to a pressure adjusting device including a casing having a pressure setting spring capable of changing the set pressure by adjusting a load and a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring.

The pressure adjusting device as described above is provided in a fluid flow path such as a gas conduit for supplying city gas to each consumer, and adjusts the secondary pressure to a desired set pressure. When city gas is supplied to each consumer through the gas conduit, the set pressure is set according to the load so that the pressure of the city gas supplied to each consumer is within a desired range even if the load fluctuates. It is required to change settings.
Therefore, in the conventional pressure adjusting device, a pressure setting unit including a pressure setting spring and a pressure adjusting screw is provided, and the pressure load of the pressure control valve is adjusted by adjusting the spring load applied to the pressure setting spring with the pressure adjusting screw. It is comprised so that setting pressure can be changed and set (for example, refer patent document 1).

  In the device described in Patent Document 1, a pilot valve that supplies a drive pressure to a pressure control valve is provided so that the secondary pressure of the fluid flow path becomes a set pressure, and the pilot valve is provided with a pressure setting unit. Yes. As shown in FIG. 2, the inside of the pilot valve 4 is divided into three upper, middle, and lower chambers 4a, 4b, and 4c by a pair of diaphragms 7 and 8, and the inside of the middle chamber 4b. The pressure is supplied to the pressure control valve as a driving pressure. Here, the code | symbol described in patent document 1 is described about the code | symbol. The lower chamber 4c is provided with a first pressure setting spring 13 as a pressure setting spring, and an adjustment screw 14 for adjusting the spring load of the first pressure setting spring 13 is provided. . Further, in addition to the configuration of the first pressure setting spring 13 and the adjusting screw 14, a second pressure setting spring 16 is provided in the upper chamber 4a, and the pressure in the pressure chamber 4e is changed from the atmospheric pressure and the atmospheric pressure. If the pressure in the pressure chamber 4e is changed from the atmospheric pressure to the high pressure side, the second pressure setting spring 16 is provided. A pressure sliding member 18 that slides so as to press is provided.

  In the device described in Patent Document 1, when the set pressure of the pressure control valve is changed to the high pressure side, the pressure in the pressure chamber 4e is changed from the atmospheric pressure to the high pressure side by the pressure changing mechanism to slide the pressure member. 18 is slid and the second pressure regulating spring 16 is pressed by the sliding member 18 to adjust the spring load of the second pressure regulating spring 16. When the set pressure of the pressure control valve is changed to the low pressure side, the pressure in the pressure chamber 4e is set to atmospheric pressure by the pressure changing mechanism, and the adjusting screw 14 is turned to turn the first pressure setting spring 13 The spring load is adjusted.

On the other hand, as another pressure control device, the pressure control valve that does not change and set the set pressure of the pressure control valve, the pressure control valve that adjusts the secondary pressure of the fluid flow paths 1 and 2 to the set pressure, and the setting of the pressure control valve There is known one provided with a pressure setting section (pilot valve 5) for setting the pressure to a predetermined pressure (see, for example, Patent Document 2).
In the device described in Patent Document 2, as shown in FIG. 5, the pressure control valve has a valve portion 3 between the primary fluid passage 1 and the secondary fluid passage 2. It is provided in the state of providing. The pressure control valve reduces the primary pressure to a preset secondary pressure and supplies the secondary pressure to the secondary fluid flow path 2. Furthermore, the pressure control valve has a drive unit 4 that controls the fluctuation of the secondary side pressure to be small even if the flow rate fluctuates with the fluctuation of the fluid demand in the secondary side fluid flow path 2. The opening degree of the valve unit 3 is controlled by the driving unit 4. The drive unit 4 changes the valve opening degree of the valve unit 3 of the pressure control valve in accordance with the drive pressure supplied from the pilot valve 5. The fluid that gives the driving pressure flows out to the secondary fluid passage 2 through the orifice 6. The fluid that has flowed out is replenished from the primary-side fluid flow path 1 via the pilot line 7, the filter 8, and the pressure reducing valve 9.
The pilot valve 5 is provided with two diaphragms, an upper diaphragm 11 and a lower diaphragm 12, which can be displaced vertically with a gap in the casing 10. A nozzle 13 is provided between the upper diaphragm 11 and the lower diaphragm 12, and the fluid whose primary pressure is reduced by the pressure reducing valve 9 is ejected upward. The nozzle 13 is provided with an opening for ejecting fluid upward. The opening of the nozzle 13 faces the lower end of the supply valve 14. An exhaust valve 15 is provided above the supply valve 14. The supply valve 14 and the exhaust valve 15 are integrally displaced up and down. In order to urge the lower diaphragm 12 from below, a spring 16 is provided.
The fluid from the primary side is introduced when the opening of the nozzle 13 is not blocked by the lower end of the supply valve 14. The introduced fluid flows out to the secondary side through a gap between a valve seat 17 provided on the upper diaphragm 11 and an exhaust valve 15 as a valve body. The fluid generates a driving pressure of a pressure between the primary side pressure and the secondary side pressure in the space between the upper diaphragm 11 and the lower diaphragm 12.
When the pilot valve 5 generates a driving pressure that is between the primary side pressure and the secondary side pressure, the pilot valve 5 causes the fluid from the primary side to flow through the nozzle 13 in the state of FIG. From the gap between the opening and the supply valve 14, it is introduced into the space between the upper diaphragm 11 and the lower diaphragm 12, and the gap between the exhaust valve 15 and the valve seat 17 of the upper diaphragm 11 is passed through, Let it flow to the secondary side. Due to the pressure drop in the gap, a driving pressure of a pressure between the primary side pressure and the secondary side pressure is obtained, and the driving pressure is supplied to the driving unit 4 of the pressure control valve.
On the other hand, when the secondary pressure suddenly rises, the pilot valve 5 causes the upper diaphragm 11 to be pressed downward due to the rise of the secondary pressure in the state of FIG. 6B, and the supply valve 14 and the exhaust valve 15 The position is also lowered. When the lower end of the supply valve 14 contacts and closes the opening of the nozzle 13, the lowering of the supply valve 14 and the exhaust valve 15 stops. As a result, the gap between the exhaust valve 15 and the valve seat 17 is increased, and the fluid in the space between the upper diaphragm 11 and the lower diaphragm 12 is easily discharged to the secondary side. Since the nozzle 13 is blocked by the supply valve 14 and the inflow of fluid from the primary side is eliminated, the driving pressure drops rapidly. When the drive pressure decreases, the drive unit 4 of the pressure control valve is driven to reduce the valve opening degree of the valve unit 3. Thereby, the flow path resistance with respect to the fluid which flows from the primary side fluid flow path 1 to the secondary side fluid flow path 2 via the valve part 3 becomes large, and the raise of a secondary side pressure is suppressed.

JP-A-2-245908 JP 2006-285664 A

In the device described in Patent Document 1, when the set pressure of the pressure control valve is changed to the low pressure side, the pressure adjusting screw is turned. This operation is performed manually by an operator or the like. Yes. However, as described above, it is required to change and set the set pressure according to the load. Since the load changes depending on the time zone, the set pressure of the pressure control valve is frequently changed and set depending on the time zone. It will be necessary. Therefore, in the case where the set pressure of the pressure control valve is changed and set by human operation, the burden on the operator becomes large.
As described above, in the pilot valve described in Patent Document 1, since the set pressure of the pressure control valve is changed and set by human operation, the burden on the operator becomes large. Therefore, it is difficult to change and set the set pressure of the pressure control valve.
The device described in Patent Document 2 is not configured to change the set pressure of the pressure control valve, and thus the set pressure of the pressure control valve cannot be changed and set according to the time zone.

On the other hand, a pilot valve equipped with a pressure setting unit having a rotation output shaft that can rotate a pressure adjustment screw that can adjust a spring load applied to the pressure setting spring and a drive unit that rotates the rotation output shaft. Is present. In this pilot valve, the rotary output shaft is driven to rotate by the drive unit, and the pressure adjustment screw is rotated by the rotary drive of the rotary output shaft, so that the set pressure of the pressure control valve can be automatically changed and set. Has been.
Therefore, for example, the pilot valve described in Patent Documents 1 and 2 is automatically replaced with the pilot valve having the rotation output shaft and the drive unit described above, thereby automatically changing the setting pressure of the pressure control valve. However, it is necessary to prepare a new pilot valve, which causes a large cost and an increase in cost. Further, when the pilot valve is replaced in this way, members that do not need to be replaced (for example, a diaphragm, a pressure setting spring, etc.) are also replaced, resulting in a large cost demerit.

  The present invention has been made in view of the above-described problems, and an object thereof is to add a configuration for automatically rotating and driving a pressure adjusting screw in a pressure adjusting device capable of setting a set pressure of a pressure control valve. Accordingly, an object of the present invention is to provide a pressure adjusting device that can automatically change and set the set pressure of the pressure control valve while simply and reducing the cost.

In order to achieve the above object, the pressure control device of the present invention comprises:
A pressure control valve for adjusting the secondary pressure of the fluid flow path to a set pressure and a pressure setting unit for changing and setting the set pressure of the pressure control valve are provided, and the pressure setting unit is configured by adjusting a spring load. A pressure adjusting device comprising a casing having a pressure setting spring capable of changing the set pressure and a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring;
A closing member that can be attached to the casing is provided. With the closing member attached to the casing, the pressure setting spring is accommodated by the closing member and the casing, and the pressure setting spring is expanded and contracted. An extended storage space is formed,
A rotation drive shaft penetrating toward the storage space in a posture along the expansion / contraction direction with respect to the closure member, and a drive unit for rotating the rotation drive shaft;
The pressure adjusting screw supports one end of the pressure setting spring and is disposed in the storage space so as to be movable along the expansion / contraction direction by the rotational drive of the rotational drive shaft by the drive unit. is there.

According to the above characteristic configuration, when the closing member is attached to the casing, the casing and the closing member form a storage space for storing the pressure setting spring therein and extending in the extending and contracting direction of the pressure setting spring. Then, by attaching the closing member to the casing, the rotation drive shaft is provided by the closing member toward the storage space in a posture along the expansion / contraction direction of the pressure setting spring. Further, the pressure adjusting screw is disposed in the storage space, but supports one end of the pressure setting spring and is movable along the expansion / contraction direction by the rotational drive of the rotational drive shaft by the drive unit. By moving the pressure adjusting screw along the expansion / contraction direction, the length of the pressure setting spring in the expansion / contraction direction is adjusted, and the spring load can be set appropriately.
Accordingly, in the pressure adjusting device capable of setting the set pressure of the pressure control valve, the pressure adjusting screw is automatically driven to rotate only by attaching the driving member and the closing member through which the rotation driving shaft is penetrated to the casing. Therefore, it is possible to realize a pressure adjusting device that can automatically change and set the set pressure of the pressure control valve while simplifying and reducing the cost.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The closing member is a cylindrical member that can be attached to the casing, and the cylindrical member and the casing extend in the expansion / contraction direction of the pressure setting spring in a state where the cylindrical member is attached to the casing. The point is that a space is formed.

  According to the above characteristic configuration, since the closing member is constituted by a cylindrical member that can be freely attached to the casing, the storage space formed by the cylindrical member and the casing is formed in the cylinder axial direction of the cylindrical member. The pressure setting spring can be extended in the direction of expansion / contraction by the length of. Thereby, for example, the storage space can appropriately store a relatively long rotation drive shaft in the axial direction.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The said closure member exists in the point screwed with respect to the said casing in the said casing side in the said expansion-contraction direction.

  According to the above characteristic configuration, the closing member is screwed into the casing on the casing side in the expansion / contraction direction of the pressure setting spring, so that the closing member can be connected to the casing relatively easily.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The pressure adjusting screw is provided with a through hole in the expansion / contraction direction, and an inner surface of the through hole and an outer peripheral surface of the rotary drive shaft are screwed together,
A common rotation prevention mechanism is provided between the pressure adjustment screw and the closing member to prevent the pressure adjustment screw from rotating with respect to the rotation drive shaft.

  According to the above characteristic configuration, the pressure adjusting screw is provided with a through hole penetrating in the expansion / contraction direction of the pressure setting spring, and the inner peripheral surface of the through hole is screwed to the outer peripheral surface of the rotary drive shaft. Thus, the rotational drive shaft is rotationally driven. At this time, since the pressure adjusting screw is prevented from rotating together with the rotation drive shaft by the co-rotation preventing mechanism, the pressure adjustment screw appropriately moves in the expansion / contraction direction of the pressure setting spring by the rotation driving of the rotation drive shaft. can do.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The cylindrical member is connected to the casing in a state in which an inner peripheral surface along the cylindrical axis direction is along the expansion / contraction direction,
The outer peripheral surface of the pressure adjusting screw is provided so as to slide along the inner peripheral surface of the cylindrical member as the rotary drive shaft is driven to rotate.

  According to the above characteristic configuration, the cylindrical member is connected to the casing in a state where the inner peripheral surface in the cylindrical axis direction is along the expansion / contraction direction of the pressure setting spring. And the pressure adjustment screw is provided so that the outer peripheral surface may slide along the inner peripheral surface of a cylindrical member. Since the pressure adjustment screw is guided in the expansion / contraction direction of the pressure setting spring by this sliding, the pressure adjustment screw can appropriately move along the expansion / contraction direction of the pressure setting spring in accordance with the rotation drive of the rotation drive shaft, The pressure setting spring can be appropriately expanded and contracted.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The casing is provided with a cylindrical portion extending in the expansion / contraction direction,
The pressure adjusting screw is configured such that an outer peripheral surface thereof is screwed to an inner peripheral surface of the cylindrical portion and is integrally rotated with the rotary drive shaft.

According to the above characteristic configuration, the pressure adjusting screw is screwed to the inner peripheral surface of the cylindrical portion extending in the expansion / contraction direction of the pressure setting spring, and the rotation driving shaft rotates with the rotation driving shaft. Since it rotates integrally, it can move appropriately along the expansion and contraction direction of the pressure setting spring.
And as demonstrated also in the said background art, conventionally, the screw | thread was provided in the internal peripheral surface of the casing along the circumferential direction. Accordingly, the conventional configuration is used as it is by screwing the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the pressure adjusting screw in a state in which the pressure adjusting screw is positively screwed to the screw. Thus, the above-described characteristic configuration can be realized while simplifying the configuration.

A further characteristic configuration of the pressure control device of the present invention is as follows.
A storage unit for storing the drive unit therein;
A first fixing member that is fitted and fixed to the storage portion, a second fixing member that is fitted and fixed to the closing member, and a distributed arrangement around the axis in a direction perpendicular to the axis of the rotation drive shaft In this state, a connecting member that connects the first fixing member and the second fixing member is provided.

  According to the above characteristic configuration, the connecting members dispersedly arranged in the direction orthogonal to the axis of the rotational drive shaft are externally attached to the first fixing member that is externally fixed to the storage portion that stores the drive portion inside, and the closure member. Since the second fixing member to be fitted and fixed is connected, the storage portion and the closing member are stably provided by the connecting points dispersed in the direction orthogonal to the axis centering on the axis of the rotation drive shaft. Connected.

A further characteristic configuration of the pressure control device of the present invention is as follows.
A bearing member for rotatably supporting the rotary drive shaft is provided at a portion of the closing member through which the rotary drive shaft is penetrated.

According to the above characteristic configuration, since the bearing member for rotatably supporting the rotational drive shaft is provided at the portion where the rotational drive shaft of the closing member is provided, the rotational drive shaft is supported by the bearing member. In this state, it can rotate well with respect to the closing member.
Since the closing member and the casing are provided separately, when the bearing member is consumed, the bearing member can be easily replaced by removing the closing member from the casing.

A further characteristic configuration of the pressure control device of the present invention is as follows.
The part where the casing and the closing member are connected and the part where the rotary drive shaft penetrates the closing member are provided with a seal member for preventing fluid flow in the part, and the casing Is provided with at least one gas flow hole, and a pipe communicating with the outside of the casing is connected to the gas flow hole.

In the above characteristic configuration, as shown in FIG. 1, the pilot valve moves the diaphragm D2 and the diaphragm D3 in the direction of the central axis due to the change of the secondary pressure, but the gas in the internal space formed by the casing and the cylindrical member is It exhibits a damper function that smoothly moves the pilot valve body in a state of gradually flowing in and out of the gas flow hole.
In addition, even if the casing is submerged, the sealing member appropriately seals the connection part between the casing and the closing member and the part through which the rotation drive shaft of the closing member penetrates. Water or the like can be prevented from entering the storage space formed by the casing and the closing member.
Further, a pipe communicating with the outside of the casing is connected to the gas flow hole. For example, if the other end of the pipe on the non-gas flow hole side is disposed above the casing, the casing is submerged. Even in this case, it is possible to prevent pressure increase due to the weight of the inflowing water or the water pressure when submerged.

It is a schematic block diagram of the pressure regulator of this invention. It is a perspective view of the pressure regulator of the present invention. It is sectional drawing of the pressure regulator which concerns on 1st Embodiment. It is a disassembled perspective view of the rotating shaft connection part of this invention. It is sectional drawing of the pressure regulator which concerns on 2nd Embodiment.

[First Embodiment]
An embodiment of a pressure regulator according to the present invention will be described with reference to the drawings.
As shown in FIG. 1 or 2, this pressure adjusting device changes and sets the pressure control valve 2 that adjusts the secondary pressure of the fluid flow path 1 to a set pressure, and the set pressure of the pressure control valve 2. And a pressure setting unit 3. The pressure adjusting device is provided with a pilot valve 4 for supplying a driving pressure to the pressure control valve 2 so that the secondary pressure of the fluid flow path 1 becomes a set pressure. 4 is adjusted so as to change and set the set pressure of the pressure control valve 2.

  Here, although illustration is omitted, for example, by branching the downstream side of the pressure control valve 2 of the fluid flow path 1 into a plurality of branch paths and connecting each of the plurality of branch paths to each consumer, It is configured to supply a fluid such as natural gas to a plurality of consumers. The secondary pressure on the downstream side of the pressure control valve 2 is adjusted to a set pressure lower than the primary pressure on the upstream side.

  The pressure control valve 2 includes a first diaphragm D1, and the interior thereof is partitioned into a first chamber H1 and a second chamber H2 by the first diaphragm D1. The pressure control valve 2 includes a first valve body B1 that opens and closes the fluid flow path 1, and the first valve body B1 is configured to be opened and closed by a first diaphragm D1. The first chamber H1 is provided with a first biasing spring G1 that presses and biases the first diaphragm D1 toward the valve closing direction of the first valve body B1.

  The pilot valve 4 includes a second diaphragm D2 and a third diaphragm D3. The second diaphragm D2 and the third diaphragm D3 include a third chamber H3, a fourth chamber H4, and a fifth chamber H5 ( (Corresponding to a storage space 61 described later). The third chamber H3 is communicatively connected to the secondary side of the fluid flow path 1 (downstream side from the pressure control valve 2) by the first secondary pressure introduction path 5, and the second secondary pressure The introduction path 6 is connected to the first chamber H1 of the pressure control valve 2 in communication. The fourth chamber H4 is connected to the primary side (upstream side of the pressure control valve 2) of the fluid flow path 1 by the primary pressure introduction path 7 and is connected to the pressure control valve 2 by the driving pressure introduction path 8. The two rooms H2 are connected in communication. Although not shown, the second diaphragm D2 and the third diaphragm D3 are connected by a connecting portion or the like, and are configured to be integrally displaceable up and down. A pressure setting spring G2 is disposed in the fifth chamber H5. The pressure setting spring 9 biases the third diaphragm D3 toward the fourth chamber H4, so that the second diaphragm D2 is third. It is urged to the chamber H3 side.

  A second valve body B2 is provided at the distal end of the primary pressure introduction path 7, and the second valve body B2 is configured to be opened and closed by a second diaphragm D2. That is, when the second diaphragm D2 is displaced toward the third chamber H3, the second valve body B2 is opened, and the fluid on the primary side of the fluid flow path 1 passes through the primary pressure introduction path 7 to the fourth chamber H4. be introduced. On the other hand, when the second diaphragm D2 is displaced toward the fourth chamber H4, the second valve body B2 is closed, and the amount of primary fluid introduced into the fourth chamber H4 is reduced.

The operation when the secondary pressure is adjusted to the set pressure will be described.
When the secondary pressure of the fluid flow path 1 falls below the set pressure, the third chamber H3 of the pilot valve 4 that is connected to the secondary side of the fluid flow path 1 through the first secondary pressure introduction path 5 And the second diaphragm D2 is displaced toward the third chamber H3 by the biasing force of the pressure setting spring 9. As a result, the second valve body B2 of the pilot valve 4 is operated to the open side, and the primary side pressure of the fluid flow path 1 is introduced into the fourth chamber H4 through the primary side pressure introduction path 7, and the pressure in the fourth chamber H4 Rises. Then, the increased pressure in the fourth chamber H4 is supplied as the driving pressure to the second chamber H2 of the pressure control valve 2 through the driving pressure introduction path 8, and the pressure in the second chamber H2 also increases, and the first chamber H1. The first diaphragm D1 is displaced toward the first chamber H1 due to the pressure difference between the first chamber H2 and the second chamber H2. Therefore, the first valve body B1 of the pressure control valve 2 is operated to the open side, and the secondary side pressure of the fluid flow path 1 is increased to adjust the secondary side pressure to the set pressure.

  On the other hand, when the secondary pressure rises above the set pressure, the pressure in the third chamber H3 of the pilot valve 4 rises, and the second diaphragm D2 moves toward the fourth chamber H4 against the biasing force of the pressure setting spring 9. Displace. As a result, the second valve body B2 of the pilot valve 4 is operated to the closed side, and there is no fluid supply source to the fourth chamber H4. Then, the fluid in the second chamber H2 is discharged to the secondary side via the orifice 91, the second secondary pressure introduction path 6, the third chamber H3, and the first secondary pressure introduction path 5, The pressure in the two chambers H2 decreases, and the first diaphragm D1 is displaced toward the second chamber H2 due to the pressure difference between the first chamber H1 and the second chamber H2. Accordingly, the first valve body B1 of the pressure control valve 2 is operated to the closed side, and the secondary side pressure of the fluid flow path 1 is reduced to adjust the secondary side pressure to the set pressure.

  The set pressure of the pressure control valve 2 is not always a constant pressure, but the set pressure is adjusted to the target set pressure that is changed according to the load or the like by providing the pressure setting unit 3. For example, in the fluid flow path 1, the load becomes large during a time period in which much demand is expected, so the pressure setting unit 3 adjusts the set pressure to a high target set pressure, and the load is set in other time periods. Therefore, the set pressure is adjusted to the low target set pressure.

  As described above, the driving pressure corresponding to the magnitude relationship between the biasing force of the pressure setting spring 9 and the secondary side pressure supplied through the first secondary side pressure introduction passage 5 in the pilot valve 4 is supplied from the pilot valve 4 to the pressure. The pressure is supplied to the control valve 2, and the secondary pressure is adjusted to the set pressure by the pressure control valve 2. Therefore, the pressure setting unit 3 changes and sets the set pressure of the pressure control valve 2, but the pressure control valve 2 is adjusted by adjusting the spring load of the pressure setting spring 9 that sets the set pressure of the pressure control valve 2. The set pressure can be changed and set freely.

  In the pressure adjusting device according to the present invention, the set pressure of the pressure control valve 2 is changed and set by adjusting the spring load of the pressure setting spring 9, but as described above, artificially turning the pressure adjusting screw 13 In the pressure adjusting device that can change and set the set pressure of the pressure control valve 2 by simple operation, a setting for automatically rotating the pressure adjusting screw 13 is added, so that the set pressure of the pressure control valve 2 is automatically set. It can be changed and set freely.

Hereinafter, a pressure adjusting device according to the present invention to which a configuration for automatically rotating the pressure adjusting screw 13 is added will be described with reference to FIG.
That is, the pressure adjusting device according to the present invention includes the casing 14 that forms the internal space 80, and includes the cylindrical member 60 (an example of a closing member) that can be attached to the casing 14. Then, in a state where the tubular member 60 is attached to the casing 14, the pressure setting spring 9 is accommodated in the inside by the in-cylinder space 81 of the tubular member 60 and the internal space 80 of the casing 14, and the pressure setting spring 9. A storage space 61 extending in the direction of expansion and contraction (the direction of arrow Z in FIG. 3) is formed. And the 1st rotating shaft J1 (an example of a rotational drive shaft) penetrated toward the storage space 61 with the attitude | position along the expansion-contraction direction (arrow Z direction of FIG. 3) of the pressure setting spring 9 with respect to the cylindrical member 60; And a drive unit (not shown) for rotationally driving the first rotation shaft J1.

  That is, when the cylindrical member 60 is attached to the casing 14 that houses the pressure setting spring 9, the expansion and contraction direction of the pressure setting spring 9 is caused by the internal space 80 inside the casing 14 and the in-cylinder space 81 of the cylindrical member 60. A storage space 61 is formed extending in the direction. In this way, by forming the storage space 61 by the internal space 80 and the in-cylinder space 81, the first rotation axis J <b> 1 is moved with respect to the storage space 61 in the expansion / contraction direction of the pressure setting spring 9 (arrow Z in FIG. 3). Direction).

  The pressure adjusting screw 13 supports one end of the pressure setting spring 9 and is disposed in the storage space 61 so as to be movable in the expansion / contraction direction of the pressure setting spring 9 by the rotational driving of the first rotation shaft J1 by the driving unit. ing. Although the pressure adjusting screw 13 is disposed in the storage space 61, it supports one end of the pressure setting spring 9, and is movable along the expansion / contraction direction by the rotational drive of the first rotating shaft J1 by the drive unit. Therefore, when the pressure adjusting screw 13 moves along the expansion / contraction direction, the length of the pressure setting spring 9 in the expansion / contraction direction is adjusted, and the spring load can be set appropriately. Accordingly, a drive unit (not shown) is provided, and a configuration for automatically rotating the pressure adjusting screw 13 only by attaching the cylindrical member 60 through which the first rotating shaft J1 is provided to the casing 14 is added. Thus, the set pressure of the pressure control valve 2 can be automatically changed and set while simplifying and reducing the cost.

The cylindrical member 60 is connected to the casing 14 in a state where the cylindrical axis is along the expansion / contraction direction of the pressure setting spring 9. The cylindrical member 60 is provided with a first threaded portion N1 along the circumferential direction on the outer circumferential surface on the casing 14 side in the expansion and contraction direction of the pressure setting spring 9. The casing 14 is provided with a second screw portion N2 along the circumferential direction of the inner peripheral surface thereof. The cylindrical member 60 is connected to the casing 14 in a state where the first screw portion N1 is screwed into the second screw portion N2. Further, when the cylindrical member 60 is connected to the casing 14, the first rotating shaft J <b> 1 is penetrated from the outside toward the storage space 61 in a state in which the axial center of the first rotating shaft J <b> 1 extends along the cylindrical axis direction. ing. Thereby, the 1st rotating shaft J1 will be provided in the state which follows the expansion-contraction direction of the pressure setting spring 9. FIG.
Here, since the 2nd screw part N2 provided along the circumferential direction of the internal peripheral surface of the casing 14 is provided in the casing 14 previously, using the 2nd screw part N2 as it is, a cylinder The shaped member 60 can be connected to the casing 14 to simplify the configuration.

  The cylindrical member 60 is provided with a bearing member 71 that rotatably supports the first rotating shaft J1 in a penetrating portion 70 through which the first rotating shaft J1 passes. The first rotating shaft J1 is the bearing member. 71 is rotatably supported around its axis.

A first seal member 68 is provided at a connection portion between the casing 14 and the cylindrical member 60, and a second seal member 69 is provided between the penetrating portion 70 of the cylindrical member 60 and the first rotation shaft J <b> 1. Is provided.
Further, at least one or more (two in FIG. 3) gas flow holes 72 are provided in the casing 14, and a pipe 73 communicating with the outside is connected to the gas flow holes 72. The other end of the pipe 73 on the non-gas flow hole side is provided on the upper side in the vertical direction (the arrow Z direction in FIG. 3). Thereby, even when the pressure setting unit 3 is submerged, water or the like can be prevented from entering the storage space 61, and the diaphragm D2 and the diaphragm D3 of the pilot valve 14 are centered by the change in the secondary pressure. When moving in the direction, the gas in the storage space 61 functions as a damper that smoothly moves the pressure adjusting screw 13 in a state where the gas flows in and out through the gas flow hole 72.

The pressure adjusting screw 13 is arranged so that one end of the pressure setting spring 9 is brought into contact with an end 62 on the pressure setting spring side (upper side in the arrow Z direction in FIG. 3). The shape of the pressure setting spring 13 is such that it has a bottom on the non-pressure setting spring side (lower side in the direction of arrow Z in FIG. 3) and is long in the expansion / contraction direction of the pressure setting spring 9 (in the direction of arrow Z in FIG. 3). It has a bottomed cylindrical shape.
The first rotation axis J1 is disposed in a state of penetrating the through hole 64. The outer peripheral surface of the pressure adjusting screw 13 is configured to be slidable along the inner peripheral surface of the tubular member 60.
Further, a third screw portion N3 is provided along the circumferential direction on the inner circumferential surface of the through hole 64 of the pressure adjusting screw 13, and a first threaded portion along the circumferential direction is provided on the outer circumferential surface of the first rotating shaft J1. A four screw portion N4 is provided, and the third screw portion N3 is screwed to the fourth screw portion N4. Thereby, by rotating the first rotating shaft J1, the pressure adjusting screw 13 is configured to be movable up and down with respect to the first rotating shaft J1 by screwing the third screw portion N3 and the fourth screw portion N4. ing. Therefore, when the pressure adjusting screw 13 moves up and down with respect to the first rotation axis J1, the pressure setting spring 9 is contracted or expanded, and the spring load of the pressure setting spring 9 can be adjusted.

  Here, the state shown in FIG. 3 shows a state in which the pressure adjusting screw 13 is screwed to the lower end portion of the first rotating shaft J1, and this state minimizes the spring load of the pressure setting spring 9. State. Therefore, by rotating the first rotating shaft J1, the pressure adjusting screw 13 is moved upward, the pressure setting spring 9 is contracted, and the spring load of the pressure setting spring 9 is changed to the increasing side. it can.

Further, a co-rotation preventing mechanism 65 is provided between the pressure adjusting screw 13 and the cylindrical member 60 to prevent the pressure adjusting screw 13 from rotating as the first rotating shaft J1 rotates. Specifically, the co-rotation preventing mechanism 65 is fitted into the notch 66 extending in the cylinder axis direction at the side of the pressure adjusting screw 13 and the notch 66 at the inner peripheral surface of the cylindrical member 60. It is comprised from the 2nd convex part 67. FIG. That is, the notch 66 is formed in a part of the pressure adjusting screw 13 in the circumferential direction, and the second protrusion 67 and the notch 66 are disposed so that the second protrusion 67 fits into the notch 66. Has been. Therefore, when the second convex portion 67 is fitted into the notch portion 66, the movement of the pressure adjusting screw 13 in the rotational direction is restricted, and the co-rotation that prevents the pressure adjusting screw 13 and the first rotating shaft J1 from co-rotating. It functions as the prevention mechanism 65.
The pressure adjusting screw 13 is screwed to the first rotating shaft J1, and the first rotating shaft J1 is rotationally driven in a state where the rotating together with the first rotating shaft J1 is prevented by the common rotation preventing mechanism 65. Thus, the pressure setting spring 9 moves in the expansion / contraction direction (the arrow Z direction in FIG. 3). And the spring load of the pressure setting spring 9 is adjusted by the pressure adjusting screw 13 moving in the expansion / contraction direction of the pressure setting spring 9 in this way.

  The drive unit that rotationally drives the first rotation axis J1 is accommodated in the accommodation unit 15 that is disposed below the first rotation axis J1. The storage unit 15 includes a second rotating shaft J2, a driving unit (not shown) that rotationally drives the second rotating shaft J2, and a control unit (not shown) that controls the operation of the driving unit. Etc. are stored, and the second rotating shaft J2 is provided in a state in which the upper end side portion protrudes upward from the storage portion 15. The upper end side portion of the second rotation axis J2 and the lower end side portion of the first rotation axis J1 are connected by the rotation connecting portion 16, and the first rotation axis J1 and the second rotation axis J2 rotate integrally. It is configured as follows.

  As shown in FIG. 4, the rotating shaft coupling portion 16 includes a first outer fitting fixing member 17 and a first outer fitting fixing member 17 that are fitted and fixed to the lower end portion of the first rotating shaft J1 from above. A first sliding support member 18 that is slidably supported in a first direction along the horizontal plane (in the direction of arrow X1 in FIG. 4), and a second direction orthogonal to the first direction in the horizontal plane ( The second sliding support member 19 that is slidably supported in the direction of the arrow X2 in FIG. 4, the manual operation member 20 that is used when manually operating the pressure adjusting screw 13, and the upper end side portion of the second rotation shaft J2 A second external fitting fixing member 21 that is externally fixed is provided. Here, in order to electrically insulate the pilot valve 4 and the accommodating part 15, the 1st sliding support member 18 and the manual operation member 20 are comprised with the insulating material, for example.

  The upper part of the first outer fitting fixing member 17 is formed in a C shape that can be fitted into the lower end part of the first rotating shaft J1. And the 1st external fitting fixing member 17 is tightened with the fasteners T, such as a volt | bolt, in the state which fitted the lower end side site | part of the 1st rotating shaft J1 in the upper side site | part of the 1st external fitting fixing member 17. The first outer fitting fixing member 17 is fitted and fixed to the lower end side portion of the first rotating shaft J1 after reducing the diameter. A first convex portion 17a extending along the first direction is formed at a lower portion of the first outer fitting fixing member 17, and an upper portion of the first sliding support member 18 is A first groove portion 18a extending along one direction is formed. Therefore, by fitting the first convex portion 17a of the first outer fitting fixing member 17 into the first groove portion 18a, the first sliding support member 18 can slide the first outer fitting fixing member 17 in the first direction. To support. The manual operation member 20 is composed of a plate-like body arranged along the horizontal plane, and a third groove portion 20a extending along the second direction is formed at the central portion of the upper surface thereof. The second sliding support member 19 is formed in a rod shape that can be fitted into the groove 20 a of the manual operation member 20. The depth of the third groove 20a of the manual operation member 20 is formed to be shallower than the height of the second sliding support member 19, and the second sliding support member 19 is manually engaged with the third groove 20a. It protrudes upward from the operation member 20. The second sliding support member 19 is fixed to the manual operation member 20 by a fastener T such as a bolt while being fitted in the third groove portion 20a. A second groove portion 18b extending along the second direction is formed at a lower portion of the first sliding support member 18, and the second sliding support member 19 is fitted into the second groove portion 18b. The second sliding support member 19 supports the first sliding support member 18 so as to be slidable in the second direction. The second outer fitting fixing member 21 is formed in a C shape that can be fitted to the upper end side portion of the second rotation shaft J2, and is fixed to the manual operation member 20 by a fastener T such as a bolt. The second outer fitting fixing member 21 is provided with a swinging lever 21a that can be swung around a horizontal axis, and the second outer fitting fixing member 21 is operated by swinging the swinging lever 21a. The diameter is configured to be reduced or expanded. As a result, when the operator manually swings the swing lever 21a, the second external fitting fixing member 21 is externally fixed to the upper end portion of the second rotating shaft J2, or the external fitting is fixed. Can be released. The above configuration facilitates not only the assembly but also the calibration (rotational angle alignment) operation. That is, according to the above configuration, the manual rotation operation member 20 is first in the axial direction of the first rotation axis J1 (the arrow Z direction in FIG. 4) than the second external fitting fixing member 21 having the swing lever 21a. It is provided on the rotating shaft J1 side. As a result, the first rotary shaft J1 and the second rotary shaft J2 are connected in a state where the manual rotation operating member 20 is fixed to the first rotary shaft J1 by a simple operation of swinging the swing lever 21a. Is released, and the first rotation axis J1 is rotated by the rotation operation of the manual rotation operation member 20, so that the calibration (rotation angle alignment) can be performed appropriately.

As for the connection between the cylindrical member 60 and the storage portion 15, as shown in FIG. 3 or FIG. 4, in addition to the rotation shaft connection portion 16 that connects the first rotation shaft J1 and the second rotation shaft J2, storage is performed. A first fixing member K1 that is externally fitted and fixed to the portion 15, a second fixing member K2 that is fixed by a fastener T such as a bolt in a state in which the cylindrical member 60 is externally fitted, and an axis of the first rotating shaft J1 A connecting member 22 that connects the first fixing member K1 and the second fixing member K2 is provided in a state in which the first fixing member K1 and the second fixing member K2 are dispersedly arranged in the direction orthogonal to the line (the straight line Y in FIG. 3).
The connection member 22 is composed of a plurality (four in this embodiment) of cylindrical bodies. Thereby, the connection member 22 has connected the 1st fixing member K1 and the 2nd fixing member K2 in the three connection locations distributed in the direction orthogonal to the axial center of the 1st rotating shaft J1. In order to electrically insulate the pilot valve 4 and the storage portion 15 from each other, for example, an insulating member is interposed between the first fixing member K1 and the connecting member 22, or the connecting member 22 itself is made of an insulating material. Or make up.

[Second Embodiment]
Next, a second embodiment of the pressure adjusting device of the present invention will be described with reference to FIG. In the second embodiment, compared to the first embodiment, the configuration of the pressure adjusting screw 13 and the configuration of the first rotating shaft J1 for moving the pressure adjusting screw 13 in the expansion / contraction direction of the pressure setting spring 9 (the arrow Z direction in FIG. 5). Is different. Therefore, in the following, a specific configuration and movement of the pressure adjusting screw 13 and the first rotating shaft J1 will be described in particular. In addition, about the structure similar to 1st Embodiment, the same code | symbol shall be attached | subjected and the description may be omitted.

  In the second embodiment, as in the first embodiment, the pressure adjusting device has a casing 14 that houses the pressure setting spring 9 in the internal space 80, and can be attached to the casing 14. A member 60 is provided. And in the state where the said cylindrical member 60 was attached to the casing 14, it extends in the expansion-contraction direction (arrow Z direction of FIG. 5) of the pressure setting spring 9 by the cylinder internal space 81 and the internal space 80 of the cylindrical member 60. A storage space 61 is formed. And the 1st rotating shaft J1 (an example of a rotational drive shaft) penetrated toward the storage space 61 with the attitude | position along the expansion-contraction direction (arrow Z direction of FIG. 5) of the pressure setting spring 9 with respect to the cylindrical member 60; And a drive unit (not shown) for rotationally driving the first rotation shaft J1.

  That is, when the cylindrical member 60 is attached to the casing 14 that houses the pressure setting spring 9, the expansion and contraction direction of the pressure setting spring 9 is caused by the internal space 80 inside the casing 14 and the in-cylinder space 81 of the cylindrical member 60. A storage space 61 is formed extending in the direction. In this way, by forming the storage space 61 by the internal space 80 and the in-cylinder space 81, the first rotation axis J <b> 1 is moved with respect to the storage space 61 in the expansion / contraction direction of the pressure setting spring 9 (arrow Z in FIG. 3). Direction).

The pressure adjusting screw 13 supports one end of the pressure setting spring 9 and is disposed in the storage space 61 so as to be movable in the expansion / contraction direction of the pressure setting spring 9 by the rotational driving of the first rotation shaft J1 by the driving unit. ing.
The pressure setting spring 9 of the pressure setting unit 3 has an upper end abutted against the third diaphragm D3 in a storage space 61 formed by the casing 14 and the cylindrical member 60, and a lower end thereof a pressure adjusting screw. 13 is in a state of being in contact with 13. The casing 14 is provided with a cylindrical portion 74 that extends in the expansion / contraction direction of the pressure setting spring 9 (the arrow Z direction in FIG. 5), and a second screw portion N2 is provided along the circumferential direction on the inner peripheral surface thereof. Is formed. On the other hand, the pressure adjustment screw 13 is formed in a plate shape, and the pressure adjustment screw 13 is provided with a fifth screw portion N5 that can be screwed to the second screw portion N2 on the outer peripheral surface thereof. The pressure adjusting screw 13 is provided in the storage space 61 in a state where the fifth screw portion N5 is screwed with the second screw portion N2 of the cylindrical portion 74. In the storage space 61 formed by the casing 14 and the cylindrical member 60, a first rotating shaft J <b> 1 that rotates integrally with the pressure adjusting screw 13 in a state of penetrating the pressure adjusting screw 13 in the expansion / contraction direction of the pressure setting spring 9 is provided. Is provided.
Since the second screw portion N2 provided along the circumferential direction of the inner peripheral surface of the cylindrical portion 74 of the casing 14 is provided in advance, the second screw portion N2 is used as it is. The fifth screw portion N5 of the pressure adjusting screw 13 is screwed into the second screw portion N2, and the pressure adjusting screw 13 is configured to be movable up and down, thereby simplifying the configuration.

With the pressure adjusting screw 13 screwing the fifth screw portion N5 into the second screw portion N2 of the cylindrical portion 74, the first rotating shaft J1 rotates, so that the first rotating shaft J1 and the pressure are adjusted. The adjustment screw 13 rotates integrally, and the pressure adjustment screw 13 moves in the expansion / contraction direction of the pressure setting spring 9. As described above, the pressure adjusting screw 13 moves in the extending / contracting direction of the pressure setting spring 9 by the integral rotation of the first rotating shaft J1 and the pressure adjusting screw 13, thereby increasing the length of the pressure setting spring 9 in the extending / contracting direction. By adjusting, the spring load of the pressure setting spring 9 is configured to be adjustable.
Here, the integral rotation of the first rotating shaft J1 and the pressure adjusting screw 13 constitutes the first rotating shaft J1 in a polygonal shape when viewed in the axial direction, and the through hole 64 at the bottom of the pressure adjusting screw 13 is formed. This is realized by configuring the shape to be the same shape as the polygonal shape.

[Another embodiment]
(A) In the above embodiment, the pressure adjusting device of the present invention has been described as including the pilot valve 4, but the pilot valve 4 may not be provided separately. That is, the first urging spring G1 of the pressure control valve 2 may be configured so that its spring load is directly adjusted in accordance with the rotational drive of the first rotating shaft J1.

  (B) In the first embodiment, the pressure adjusting screw 13 has been described as having a bottom on the non-pressure setting spring side (lower side in the direction of arrow Z in FIG. 3) in FIG. It is good also as a structure which has a bottom part in the side (Upper side in the arrow Z direction in FIG. 3).

  (C) In the second embodiment, in order to rotate the first rotating shaft J1 and the pressure adjusting screw 13 integrally, the first rotating shaft J1 is configured in a polygonal shape when viewed in the axial direction, The shape of the through hole 64 at the bottom of the pressure adjusting screw 13 was configured to be the same shape as the polygonal shape. Here, the shape of the first rotating shaft J1 in the axial direction and the shape of the through hole 64 at the bottom of the pressure adjusting screw 13 are as long as the first rotating shaft J1 and the pressure adjusting screw 13 can rotate integrally. It may be a simple shape. For example, the first rotating shaft J1 has a shape with a protrusion around the axis or a non-circular shape (such as an ellipse) as viewed in the axial direction, and a through-hole at the bottom of the pressure adjusting screw 13 By making 64 the same shape as that, it is possible to realize an integral rotation of the first rotating shaft J1 and the pressure adjusting screw 13.

  (D) In the said 2nd Embodiment, the obstruction | occlusion member demonstrated as the cylindrical member 60 extended in the expansion-contraction direction of the pressure setting spring 9. As shown in FIG. However, the blocking member does not have to be a cylindrical member, and is a member that can penetrate the first rotating shaft J1 in a posture along the expansion / contraction direction of the pressure setting spring 9 (the arrow Z direction in FIG. 5). Anything is acceptable. For example, it can be a plate-like member along a direction orthogonal to the axial center direction (the arrow Z direction in FIG. 5) of the first rotation axis J1.

  The pressure adjusting device of the present invention is a pressure adjusting device capable of changing and setting the set pressure of the pressure control valve by an artificial operation of turning a pressure adjusting screw. The pressure adjusting device includes a drive unit and a cylindrical shape through which a rotation drive shaft is provided. By simply adding a component to the casing, a configuration for automatically rotating the pressure adjustment screw can be added to automatically change and set the set pressure of the pressure control valve while reducing costs. It can be effectively used as a pressure adjusting device capable of

DESCRIPTION OF SYMBOLS 1 Fluid flow path 2 Pressure control valve 3 Pressure setting part 11 Drive part 13 Pressure adjusting screw 14 Casing 15 Storage part 60 Cylindrical member 61 Storage space 62 End part 64 by pressure setting spring side Through-hole 65 Joint rotation prevention mechanism 68 1st Seal member 69 Second seal member 70 Penetration portion 71 Bearing member 72 Gas flow hole 73 Pipe 74 Tubular portion G2 Pressure setting spring J1 First rotation shaft (an example of a rotation drive shaft)
K1 1st fixing member K2 2nd fixing member Y Axis center Z of the 1st rotating shaft J1 The expansion-contraction direction of a pressure setting spring

Claims (9)

A pressure control valve for adjusting the secondary pressure of the fluid flow path to a set pressure and a pressure setting unit for changing and setting the set pressure of the pressure control valve are provided, and the pressure setting unit is configured by adjusting a spring load. A pressure adjusting device comprising a casing having a pressure setting spring capable of changing the set pressure and a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring;
A closing member that can be attached to the casing is provided. With the closing member attached to the casing, the pressure setting spring is accommodated by the closing member and the casing, and the pressure setting spring is expanded and contracted. An extended storage space is formed,
A rotation drive shaft penetrating toward the storage space in a posture along the expansion / contraction direction with respect to the closure member, and a drive unit for rotating the rotation drive shaft;
The pressure adjustment screw supports one end of the pressure setting spring and is arranged in the storage space so as to be movable along the expansion / contraction direction by the rotational drive of the rotational drive shaft by the drive unit. apparatus.   The closing member is a cylindrical member that can be attached to the casing, and the cylindrical member and the casing extend in the expansion / contraction direction of the pressure setting spring in a state where the cylindrical member is attached to the casing. The pressure regulator according to claim 1, wherein a space is formed.   The pressure adjusting device according to claim 1, wherein the closing member is screwed to the casing on the casing side in the expansion / contraction direction. The pressure adjusting screw is provided with a through hole in the expansion / contraction direction, and an inner surface of the through hole and an outer peripheral surface of the rotary drive shaft are screwed together,
4. The co-rotation prevention mechanism is provided between the pressure adjustment screw and the closing member, and the co-rotation prevention mechanism prevents the pressure adjustment screw from co-rotating with the rotation drive shaft. Pressure regulator. The cylindrical member is connected to the casing in a state in which an inner peripheral surface along the cylindrical axis direction is along the expansion / contraction direction,
The pressure adjusting device according to claim 2, wherein the outer peripheral surface of the pressure adjusting screw is provided so as to slide along the inner peripheral surface of the cylindrical member as the rotary drive shaft is driven to rotate. The casing is provided with a cylindrical portion extending in the expansion / contraction direction,
3. The pressure adjusting device according to claim 1, wherein the pressure adjusting screw is configured so that an outer peripheral surface of the pressure adjusting screw is screwed to an inner peripheral surface of the cylindrical portion and is integrally rotated with the rotation drive shaft. A storage unit for storing the drive unit therein;
A first fixing member that is fitted and fixed to the storage portion, a second fixing member that is fitted and fixed to the closing member, and a distributed arrangement around the axis in a direction perpendicular to the axis of the rotation drive shaft The pressure adjusting device according to any one of claims 1 to 6, wherein a connecting member that connects the first fixing member and the second fixing member in a state of being provided is provided.   The pressure adjusting device according to any one of claims 1 to 7, wherein a bearing member that rotatably supports the rotary drive shaft is provided at a portion of the closing member through which the rotary drive shaft is provided. .   The part where the casing and the closing member are connected and the part where the rotary drive shaft penetrates the closing member are provided with a seal member for preventing fluid flow in the part, and the casing 9 is provided with at least one gas flow hole, and a pipe communicating with the outside of the casing is connected to the gas flow hole. Pressure regulator.

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