JP4061439B2 - Release valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an open valve used in a wet sprinkler fire extinguishing facility or the like.
[0002]
[Prior art]
The sprinkler fire extinguishing equipment is equipped with a water flow detection valve.This water flow detection valve opens when the sprinkler head opens due to the occurrence of a fire, etc., and starts water discharge, and from the primary side to the secondary side. This is a notification that running water has started. Conventionally, a swing type check valve has been used as the flowing water detection valve. By flowing water based on the opening and closing of the swing type valve body, the switch of the flowing water detecting means is turned on to generate a flowing water signal.
[0003]
[Problems to be solved by the invention]
The conventional swing-type water flow detection valve has a structure that can reliably open and close the valve and can easily prevent backflow, but on the other hand, fine adjustment of the flow rate is difficult and a pressure adjustment function is provided. Therefore, the secondary pressure cannot be maintained at a predetermined pressure.
[0004]
In view of the above circumstances, an object of the present invention is to enable the secondary side to be maintained at a predetermined pressure. Another purpose is to enable accurate detection of running water.
[0005]
[Means for Solving the Problems]
Means for solving the problems are as follows.
[0006]
The present invention connects a lift-type valve body that opens and closes a valve seat of a main body, a piston provided on the back surface of the valve body, a cylinder chamber in which the piston is inserted, a primary side and a secondary side, and a bypass passage, a water flow detection means actuated by the lift of the valve body, a release valve having a communicating with the cylinder chamber; a pressure regulating pilot valve to the downstream side bypass path of the cylinder chamber is provided, wherein The valve seat includes a leg portion, and the valve body has a cylindrical or disk-shaped non-opening region at an upper portion, an open region is provided at a lower portion of the non-opening region, and the valve seat A leg is provided with a skirt inserted through a labyrinth gap, and the labyrinth gap is formed between the non-opening region and the valve seat;
The height of the leg portion is a height at which a seal is generated in the labyrinth gap, and the flowing water detecting means operates when the valve body is lifted by a height of the non-opening region. .
[0007]
In the present invention , the valve body is reliably lifted even at a small flow rate .
[0008]
It said water flow detection means of the invention, the valve body back of the rod, and a limit switch provided in the movement path of the rod, characterized in Tona Rukoto.
[0009]
This invention features that you have an orifice is provided in the bypass passage on the upstream side of the cylinder chamber.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A valve seat is provided at the communication port between the primary side and the secondary side, and a lift type valve element is seated on the valve seat. A piston is provided on the back surface of the lift type valve element, and this piston is inserted into the cylinder chamber. The cylinder chamber is connected to a bypass path that connects the primary side and the secondary side. An orifice is provided in the bypass path upstream of the cylinder chamber, and a pressure regulating pilot valve is provided downstream thereof.
When the pressure on the secondary side slightly decreases due to water leakage or the like, the pressure control pilot valve opens and water supply to the secondary side is started. When the secondary side reaches the monitoring pressure, the pilot valve is closed and the water supply is stopped.
[0011]
When secondary side water flows out of the sprinkler head due to fire, etc., the pressure regulating pilot valve opens and water supply to the secondary side starts. However, if it flows out by a predetermined flow rate, for example, one sprinkler head, the fire extinguishing water in the cylinder chamber is rapidly reduced, and the water pressure is rapidly lowered. For this reason, it lifted lift type valve body, opening extinguishing water in the secondary side flows out from the primary side open.
[0012]
At this time, the running water detection means that operates in conjunction with the lift type valve element operates to notify the running water.
On the primary side of the lift-type valve body, a skirt having a non-opening region is provided on the upper portion, and a labyrinth gap is formed between the non-opening region of the skirt and the leg portion of the valve seat. Therefore, the lift-type valve element reliably lifts a predetermined amount when the secondary side reaches a predetermined flow rate, and accurately operates the water flow detection means.
In this way, it has a function to keep the secondary side pressure constant regardless of the primary side pressure and flowing water, and by providing an orifice between the primary side and the cylinder, a constant flow rate due to opening of the sprinkler head, etc. When there is a running water, the valve body can be lifted up to detect the running water.
At this time, there is a non-operating flow area where there is flowing water only in the bypass path, and there is an operating flow area where the flowing water in the bypass path is insufficient and the cylinder chamber is decompressed to open the valve body. The valve body can reliably lift the predetermined amount to detect the flowing water.
[0013]
【Example】
The opening valve of the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. This opening valve is a pressure reducing opening type pressure regulating valve disposed in a wet sprinkler fire extinguishing equipment, and lift type running water detection. It is also a valve.
The main body 1 is provided with a communication port 2. The communication port 2 communicates a primary side 3 communicating with a water source pump (not shown) and a secondary side 5 communicating with a sprinkler head. A valve seat 6 is attached to the communication port 2. The valve seat 6 includes a valve seat portion 7 and a leg portion 8 having an inner diameter L2.
[0014]
A valve body 10 is seated on the valve seat 6. A cylindrical piston 11 is formed on the outer periphery of the back surface of the valve body 10, and a rod 13 for operating the limit switch 12 is erected at the center thereof. The piston 11 is inserted into the cylinder chamber 15.
[0015]
The head 16 of the cylinder chamber 15 is provided with a through hole 17 and a limit switch 12 as flowing water detection means. The rod 13 is inserted into the through hole 17 through a sealing means 18. The limit switch 12 is provided in the movement locus of the rod 13, and a protective cover 19 is provided on the limit switch 12. Between the head 16 of the cylinder chamber 15 and the back surface of the valve body 10, a spring 20 that biases in the valve closing direction is stretched.
In addition, the seating part 10a of the valve body 10 is formed of a sealing member such as rubber.
Here, as a method of the flowing water detection means, the limit switch 12 is operated by the rod 13, but other methods may be used. For example, a rod protruding to the primary side of the valve body 10 is provided, and the main body 1 may be provided with a water flow hole, which is normally sealed with a rod, and a pressure switch for detecting water flow to the water flow hole when the valve body 10 is lifted up may be provided.
[0016]
The cylinder chamber 15 is connected to a bypass path 22 that connects the primary side 3 and the secondary side 5. An orifice 21 is provided in the bypass path 22 on the upstream side of the cylinder chamber 15, and a pressure regulating pilot valve 25 is provided on the downstream side thereof.
[0017]
The pressure regulation pilot valve 25 includes a valve portion 29 that is separated from and in contact with the valve seat 28, a diaphragm 30 that is connected to the valve portion 29, and a spring 31 that biases the diaphragm 30 in the valve opening direction. A safety valve 33 is provided between the pressure regulation pilot valve 25 and the secondary side 5. The safety valve 33 includes a valve portion 34 that is separated from and in contact with the valve seat 35, and a spring 32 that biases the valve portion 34 in the valve closing direction.
[0018]
A skirt 36 having a height H and a diameter L ₁ is fixed to the inner peripheral side of the seat 10 a of the valve body 10. The skirt 36 includes a bottom surface portion 37 and a skirt portion 38, and the bottom surface portion 37 is screwed to the valve body 10.
[0019]
A cylindrical non-opening region 40 is provided in the upper part of the skirt portion 38. The height H ₁ of the region 40 is shorter than the height H ₂ of the leg portion 8 of the valve seat 6, but the heights H ₁ and H ₂ of both are appropriately selected as necessary.
[0020]
A labyrinth gap t is formed between the non-opening region 40 and the leg portion 8, and the size of the gap t is preferably narrow based on the minimum flow rate required for the on-off valve. In order to sufficiently exert the pressure function, it is preferable that the flow rate when passing through the gap t is small. Accordingly, in consideration of design accuracy, the height H2 of the leg portion 8 of the valve seat 6 is selected to be high enough to cause a seal due to the labyrinth effect.
[0021]
An opening region 41 is provided below the non-opening region 40 of the skirt portion 38. The opening area 41 includes a small opening 42 and a large opening 43 continuous with the small opening 42. The small opening 42 and the large opening 43 are formed in a semi-elliptical shape, but the size, shape, and the like are appropriately selected as necessary.
[0022]
Next, the operation of this embodiment will be described.
When there is no flowing water from the sprinkler head or the like at all times, the cylinder body 15 is pressurized by the primary side 3 and the valve body 10 is completely closed. At this time, the pressure on the secondary side 5 is constantly pressurized with a monitoring pressure, for example, 6 kg / cm 2, by the action of the pressure regulating pilot valve 25 in the bypass path 22. This is because the valve portion 29 of the pressure regulating pilot valve 25 is seated on the valve seat 28 by the spring 31 through the diaphragm 30 and the pressure on the secondary side 5 is 6 kg / cm ² .
[0023]
When there is a small amount of water leakage on the secondary side, the pressure on the secondary side 5 decreases, so that the pressure regulating pilot valve 25 is slightly opened and the secondary side 5 is slightly replenished with water for fire extinguishing. At this time, since the cylinder chamber 15 hardly depressurizes, the valve body 10 does not move. That is, the valve closing state is maintained.
[0024]
Sprinkler head in the secondary side 5 is operated, if there is a certain or more of the flowing water, the secondary side 5 is opened largely reduced pressure regulating pilot valve 25 greater than that of the upper Symbol pressure of the secondary side 5 Refill with primary fire-fighting water. At this time, since the orifice 21 is provided in the bypass path 22, the supply of the fire-extinguishing water w from the primary side 3 to the secondary side 5 through the bypass path 22 is not in time. Therefore, the cylinder chamber 15 is depressurized and the valve body 10 starts to lift.
[0025]
When the valve body 10 begins to lift, the skirt portion 38 of the skirt 36 begins to rise, but since there is a labyrinth gap t between the skirt portion 38 and the leg portion 8 of the valve seat, the flow rate passing through this gap t. Is sufficiently suppressed. Therefore, the valve body 10 is reliably lifted by the height H ₁ of the non-opening region 40 corresponding to the pressure decrease on the secondary side. Since the rod 13 operates the limit switch 12 by the lift amount of the valve body 10, the flowing water detection signal can be reliably output.
[0026]
When the skirt portion 38 rises in height H ₁ and the small opening 42 moves above the valve seat 6 as shown by a one-dot chain line in FIG. 2, the fire-extinguishing water w is moved to the secondary side 5 through the small opening 42. Inflow. When the pressure on the secondary side 5 falls below the monitoring pressure of the pressure regulating pilot valve 25, the pilot valve 25 is further opened to further depressurize the cylinder chamber 15.
If it does so, the valve body 10 will be lifted at a stretch and the pressure of the secondary side 5 will be raised.
[0027]
When the pressure on the secondary side 5 rises and exceeds the monitoring pressure, the valve portion 29 of the pressure regulating pilot valve 25 narrows the opening degree. Therefore, the pressure in the cylinder chamber 15 is not reduced so much, and the relationship between the flow rate in the pressure regulating pilot valve 25, the degree of pressure reduction in the cylinder chamber 15 and the degree of opening of the valve body 10 of the release valve is in an equilibrium state.
As a result, the sprinkler head is supplied with fire-fighting water necessary for water spraying at an appropriate pressure, and water spray with a fire-extinguishing effect is possible.
[0028]
The secondary side 5 pipe is provided with a safety valve 33 so that an unintentional high pressure does not occur even if a resin pipe such as a molybdenum pipe is used.
The upper limit of the pressure of the resin pipe is approximately 7 kg / cm ² , but in consideration of safety, the pressure can be discharged from the safety valve 33 at 6.5 kg / cm ² .
Moreover, in the flowing water detection valve which has a pressure regulation function like an Example, it is sealed with the communicating port 2 by the valve body 10 as a flowing water detection means, for example, a pressure switch using the flowing water detection chamber by a double valve seat, for example Even when flowing water is detected, there is an effect by providing the non-opening region 41 in the skirt 36 of the valve body 10, and chattering between the flowing water detection chamber and the seating portion 10a of the valve body 10 can be prevented. After the valve body 10 is lifted in the non-opening region 41, the seating portion 10a of the valve body 10 is not sucked into the low-pressure flowing water detection chamber.
[0029]
A second embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the first embodiment is that the non-opening region 40 of the skirt 36 has a disk shape instead of a cylindrical shape.
[0030]
A third embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the first embodiment is that the skirt 36 is a cylindrical non-opening region 40 and a conical cylinder that is continuous with the non-opening region 40 and has a smaller diameter toward the tip 36a. The skirt part 50 of this is comprised.
[0031]
The embodiment of the present invention is not limited to the above. For example, instead of providing the rod 13 of the flowing water detecting means on the back surface of the valve body 10, the limit switch 12 is provided on the primary side 3 instead. It may be provided in the main body.
[0032]
【The invention's effect】
Since the present invention includes the pressure regulating pilot valve as described above, the secondary pressure can be maintained at a predetermined pressure.
Further, since the non-opening region is provided in the skirt, a labyrinth gap is generated between the leg portion of the valve seat. Therefore, the valve body can be lifted reliably by the sealing effect, and the flowing water detection means can be operated accurately.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged sectional view showing a second embodiment of the present invention and corresponding to FIG.
FIG. 4 is an enlarged cross-sectional view showing a third embodiment of the present invention and corresponding to FIG.
[Explanation of symbols]
2 Communication port 3 Primary side 5 Secondary side 6 Valve seat 8 Leg 10 Valve body 12 Limit switch 15 Cylinder chamber 22 Bypass path 25 Pressure regulation pilot 36 Skirt 40 Non-opening region

Claims (3)

A lift-type valve body that opens and closes the valve seat of the main body, a piston provided on the back surface of the valve body, a cylinder chamber in which the piston is inserted, a primary side and a secondary side are connected, and the cylinder chamber An open valve comprising a bypass path in communication and flowing water detection means that is activated by a lift of the valve body ;
A pressure regulating pilot valve is provided in the bypass path on the downstream side of the cylinder chamber,
The valve seat includes a leg portion,
The valve body has a cylindrical or disk-shaped non-opening region at an upper portion, an open region is provided at a lower portion of the non-opening region, and is inserted into a leg portion of the valve seat via a labyrinth gap. It has a skirt,
The labyrinth gap is formed between the non-opening region and the valve seat,
Height of the legs, Ri height der the seal occurs in the labyrinth gap,
It said water flow detection means, opening valve characterized that you activated when the valve body is by the height of lift of the non open area. It said water flow detection means, and the valve body back of the rod, and a limit switch provided in the movement path of the rod, open valve according to claim 1, wherein Tona Rukoto. Claim 1, characterized that you have an orifice is provided in the bypass passage on the upstream side of the cylinder chamber, or, 2 open valve according.

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