JP2016084825A - Repair method of existing valve, existing valve, water stop member for repair and valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair method of an existing valve capable of facilitating repair and stopping water leakage, in a case where water leakage occurs from a shaft seal part.SOLUTION: In a repair method of an existing valve subjected to opening/closing operation with an operation machine 5, when water leakage occurs from a shaft seal part 15 of a valve rod 10 penetrating a valve box 2, the operation machine 5 is removed from the tip part of the valve rod 10 to expose the tip part of the valve rod 10, a water stop member 41 for repair is externally fitted to the tip part of the valve rod 10, the operation machine 5 is attached to the tip part of the valve rod 10, and water leakage passing the shaft seal part 15 is cut off at the water stop member 41 for repair.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a repair method for leakage from a shaft seal portion of an existing valve, an existing valve, a water-stopping member for repair, and a valve.

  Conventionally, a butterfly valve is provided in piping buried in the ground, and the butterfly valve is opened and closed from the ground. As shown in FIG. 11, an operating device 103 is connected to the upper end portion of the valve rod 102 of the butterfly valve 101. The valve stem 102 penetrates the valve box 104, and the shaft seal portion 105 stops water between the valve stem 102 and the valve box 104.

The shaft sealing portion 105 has two upper and lower O-rings 106. The operating device 103 has a rotation input shaft 107 protruding upward, and has a reduction gear mechanism inside.
According to this, when the operator inserts the lower end portion of the T-shaped operation handle into the rotation input shaft 107 of the operating device 103 from the ground and rotates the operation handle, the rotation input shaft 107 rotates, and this rotation is decelerated. This is transmitted to the valve stem 102, and the valve stem 102 rotates to switch the opening and closing of the butterfly valve 101. Further, the water flowing through the valve box 104 of the butterfly valve 101 is stopped by the O-ring 106 of the shaft seal portion 105.

  The butterfly valve as described above is described in, for example, Patent Document 1 below.

JP2003-232451

  In the above conventional type, the O-ring 106 of the shaft seal portion 105 is in sliding contact with the rotating valve stem 102, so that the O-ring 106 is easily damaged. If the O-ring 106 is damaged and the water W in the valve box 104 leaks to the outside of the valve box 104 through the gap 108 between the valve rod 102 and the valve box 104, the damaged O-ring 106 is removed. The O-ring 106 is replaced with a new one.

  However, such an O-ring replacement operation requires troublesome operations such as removing the butterfly valve 101 from the piping, removing the operating device 103 from the valve box 104, and disassembling the shaft seal portion 105. There is a problem that it takes time and labor to repair the water leakage.

  An object of the present invention is to provide an existing valve repairing method, an existing valve, a water-stopping member for repair, and a valve that can be easily repaired to stop the water leakage when water leakage from the shaft seal portion occurs. To do.

In order to achieve the above object, the first invention is a method for repairing an existing valve that is opened and closed by an operating device,
If water leaks from the shaft seal of the valve stem that penetrates the valve box, remove the operating device from the tip of the valve stem to expose the tip of the valve stem,
Fit a water stop member for repair on the tip of the valve stem,
An operating machine is attached to the tip of the valve stem, and water leakage that passes through the shaft seal is stopped by a repair water stop member.

  According to this, when water leakage occurs in the existing valve, remove the operating device, attach a repair water stop member to the exposed tip of the valve stem, attach it to the existing valve, and then attach the operating device to the valve stem. By attaching to the tip, water leakage that has passed through the shaft seal is stopped by the repair water stop member. Thereby, it can repair easily and can stop the water leak to the exterior.

In the repair method of the existing valve in the second invention, a water stop member for repair is externally fitted to the tip of the valve stem,
An operating machine is attached to the tip of the valve stem, and a water stop member for repair is stored inside the operating machine.

  According to this, after removing the operating device, fitting a water stop member for repairing to the exposed tip of the valve stem and attaching it to the existing valve, and then attaching the operating device to the tip of the valve stem, A water stop member is housed inside the controller.

In the repair method of the existing valve in the third invention, a water stop member for repair is externally fitted to the tip of the valve stem,
An operating machine is attached to the tip of the valve stem, and a repair water stop member is held between the operating machine and the valve box.

  According to this, after removing the operating device, fitting a water stop member for repairing to the exposed tip of the valve stem and attaching it to the existing valve, and then attaching the operating device to the tip of the valve stem, A water stop member is held between the operating device and the valve box.

The fourth invention is an existing valve characterized by being repaired by the repair method described in any one of the first to third inventions.
The fifth invention is a waterproofing member for repair used in the repair method described in any one of the first to third inventions,
It has a water stop member body that can be externally fitted to the tip of the valve stem,
The water stop member body has a shaft hole portion into which the tip of the valve stem is inserted,
A sealing groove facing the shaft hole is formed on the inner peripheral surface of the water stop member main body over the entire circumference.

  According to this, a ring-shaped sealing body is attached to the sealing groove of the water-stopping member main body, the operating device is removed, the exposed tip of the valve stem is inserted into the shaft hole of the water-stopping member main body, The member body is fitted on the tip of the valve stem and attached to the existing valve. After that, by attaching the operating device to the tip of the valve stem, the water stop member main body and the valve stem are stopped by the seal member of the water stop member main body, and the water leakage that has passed through the shaft seal is the water stop member main body. Water is stopped by the seal body.

The repair water-stopping member according to the sixth aspect of the present invention is such that a ring-shaped sealing body is mounted in the sealing groove.
In the seventh invention, the valve stem penetrates the valve box,
Water is shut off between the valve stem and the valve box at the shaft seal,
A water stop member for repair that can be attached to a valve that is opened and closed by an operating device connected to a valve stem,
It has a water stop member body that can be externally fitted to the tip of the valve stem,
The water stop member body has a shaft hole portion into which the tip of the valve stem is inserted,
A sealing groove facing the shaft hole is formed on the inner peripheral surface of the water stop member main body over the entire circumference.

  According to this, a ring-shaped sealing body is attached to the sealing groove of the water stop member main body, the tip of the valve stem is inserted into the shaft hole portion of the water stop member main body, and the water stop member main body is attached to the valve stem. Fits on the tip and attaches to the valve. Thereafter, the controller is attached to the tip of the valve stem so that the space between the water stop member main body and the valve stem is stopped by the seal member of the water stop member main body.

The water stop member for repair according to the eighth aspect of the present invention is such that a ring-shaped seal body is mounted in the seal groove.
The ninth aspect of the present invention is a valve characterized by having a mounting portion to which the water-stopping member for repair described in the seventh or eighth aspect of the present invention can be mounted.

According to this, the front end portion of the valve stem is inserted into the shaft hole portion of the water stop member main body, the water stop member main body is externally fitted to the front end portion of the valve stem, and is attached to the attachment portion of the valve.
The tenth aspect of the present invention is a valve characterized in that the water-stopping member for repair described in the seventh aspect or the eighth aspect is attached to the mounting portion described in the ninth aspect.

  As described above, according to the present invention, when water leaks from the shaft seal portion, it can be easily repaired and water leakage to the outside can be stopped.

It is sectional drawing of the butterfly valve which attached the water stop member for repair in the 1st Embodiment of this invention. It is an expanded sectional view of the upper shaft seal part of the butterfly valve which attached the water stop member for repair same as the above. It is a partially notched top view of the fixing member of a butterfly valve. It is a XX arrow line view in FIG. It is a longitudinal cross-sectional view of the water stop member for repair same as the above. It is a XX arrow line view in FIG. It is an expanded sectional view of the upper shaft seal part of the existing butterfly valve which has not attached the water stop member for repair similarly. It is an expanded sectional view explaining the procedure at the time of attaching a water stop member for repair to a butterfly valve. It is an expanded sectional view of the upper shaft seal part of the butterfly valve which attached the water stop member for repair in the 2nd embodiment of the present invention. It is an expanded sectional view of the upper shaft seal part of the butterfly valve which attached the water stop member for repair in a 3rd embodiment of the present invention. It is an expanded sectional view of the upper shaft seal part of the conventional butterfly valve.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIG. 1, reference numeral 1 denotes a butterfly valve which is an example of a valve. The butterfly valve 1 is provided, for example, in a pipe buried in the ground, and a valve box 2 A disc-shaped valve body 3, a valve rod 4 provided on the valve body 3, and an operating device 5 for opening and closing the valve body 3. The valve stem 4 is divided into an upper valve stem 10 and a lower valve stem 11 and is rotatable around a vertical axis 12.

  As shown in FIGS. 1 and 2, the valve box 2 has a cylindrical upper boss portion 13 in the upper portion and a lower boss portion 53 in the lower portion. A rod hole 14 is formed in the upper boss portion 13, and the upper valve rod 10 is inserted through the rod hole 14 and penetrates the valve box 2. A flange portion 19 is provided at the upper end of the upper boss portion 13.

  Between the upper valve stem 10 and the upper boss portion 13, water is stopped by an upper shaft sealing portion 15. The upper shaft seal 15 includes an O-ring case 16 that is fitted in the rod hole 14 and fixed to the upper boss 13, two upper and lower O-rings 17 that are provided on the inner periphery of the O-ring case 16, and an O-ring case 16. And an O-ring 18 provided on the outer periphery of the ring case 16. The O-ring case 16 is externally fitted to the upper valve stem 10, the O-ring 17 stops water between the upper valve stem 10 and the O-ring case 16, and the O-ring 18 is connected to the O-ring case 16 and the upper boss. The water between the part 13 is stopped.

  The operating device 5 includes a housing 24, a rotary input shaft 20 protruding above the housing 24, a reduction gear mechanism 21 housed inside the housing 24, and a flange portion 25 provided at the lower end portion of the housing 24. have. The upper end portion of the upper valve stem 10 is connected to the rotation output side of the operating device 5.

  As shown in FIGS. 2 and 3, a through hole 22 penetrating in the diametrical direction is formed in the upper portion of the upper valve stem 10. A fixing member 27 is provided between the flange portion 19 of the valve box 2 and the flange portion 25 of the operating device 5 to fix the valve body 3 at the fully open position O and the fully closed position S. As shown in FIGS. 3 and 4, the fixing member 27 is an annular member having a through hole 28 through which the upper valve stem 10 is inserted at the center. The fixing member 27 has first and second fixing holes 29 and 30 that are orthogonal to each other in the diameter direction.

  As shown in FIG. 3, when the valve body 3 rotates to the fully open position O, the first fixed hole 29 and the through hole 22 of the upper valve stem 10 are arranged and communicated with each other, and the valve body 3 is fully closed. When rotated to the position S, the second fixed hole 30 and the through hole 22 of the upper valve stem 10 are arranged in a straight line and communicate with each other.

  A plurality of plugs 32 for closing the outer peripheral opening ends of the first and second fixing holes 29 and 30 are detachably attached to the outer peripheral portion of the fixing member 27. A fixing rod 33 can be inserted into and removed from the through hole 22 and the first and second fixing holes 29 and 30.

  Both the flange portions 19 and 25 and the fixing member 27 are connected by a plurality of bolts 34 and a plurality of sets of upper and lower pairs of nuts 35 and 36. As shown in FIGS. 3 and 4, the fixing member 27 is formed with a plurality of bolt holes 37 penetrating at both upper and lower ends at predetermined intervals in the circumferential direction. As shown in FIGS. 2 and 4, a female screw is formed in the bolt hole 37, a male screw part 34 a is formed at the center of the bolt 34, the bolt 34 is inserted into the bolt hole 37, and the male screw part 34 a is the bolt hole. The bolt 34 is integrally connected to the fixing member 27 by being screwed into the female screw 37. In addition, water is stopped by an O-ring 38 between the flange portion 19 of the valve box 2 and the lower surface of the fixing member 27.

  As shown in FIGS. 2, 5, and 6, 41 is a water stop member for repair that is detachable from the butterfly valve 1. The water-stopping member 41 for repair has an annular water-stopping member main body 42 that can be fitted on the upper end of the upper valve stem 10, and O-rings 43 and 44 (an example of a seal body).

  The water stop member main body 42 has a shaft hole portion 45 into which the upper end portion of the upper valve stem 10 is inserted, and is detachably attached to the upper surface of the fixing member 27 by a plurality of attachment bolts 49. A plurality of bolt holes 50 are formed in the water stop member main body 42, and the mounting bolts 49 are inserted into the bolt holes 50.

  Further, an O-ring groove 46 (an example of a sealing groove) facing the shaft hole 45 is formed on the inner peripheral surface of the water stop member main body 42 over the entire circumference, and the O-ring 43 is formed in the O-ring groove 46. It is inserted. Further, an O-ring groove 48 is formed on the lower surface of the water stop member main body 42 so as to surround the shaft hole portion 45, and the O-ring 44 is fitted into the O-ring groove 48.

As shown in FIG. 2, an attachment space 47 (an example of an attachment portion) in which the repair water stop member 41 can be attached is formed in the lower portion of the housing 24 of the operating device 5.
As shown in FIG. 1, the lower end of the lower valve stem 11 is inserted into the lower boss portion 53, and the opening of the lower boss portion 53 is closed with a bottom lid 54. The bottom lid 54 is provided with a bottom O-ring 55 that stops water between the lower boss portion 53 and the bottom lid 54. The bottom lid 54 and the bottom O-ring 55 constitute a lower shaft sealing portion 56.

Below, the repair method of the existing butterfly valve 1 is demonstrated.
As shown in FIG. 7, the existing butterfly valve 1 is not provided with a repair water stop member 41, and an operator fits a T-shaped operation handle 51 from the ground onto the rotary input shaft 20 of the operating device 5. When the operation handle 51 is turned, the rotation input shaft 20 rotates, the rotation of the rotation input shaft 20 is decelerated by the reduction gear mechanism 21 and transmitted to the upper valve stem 10, and the upper valve stem 10 rotates. Thus, the valve body 3 opens and closes.

  Since the O-ring 17 is slidably contacted with the rotating upper valve stem 10, the O-ring 17 is easily damaged. When the O-ring 17 is damaged when the valve body 3 is opened, the water in the valve box 2 is separated from the outer peripheral surface of the upper valve stem 10. Leaks upward of the fixing member 27 through the gap between the inner peripheral surface of the O-ring case 16 and further through the gap between the outer peripheral surface of the upper valve stem 10 and the inner peripheral surface of the fixing member 27.

  When water leaks from the upper shaft seal 15 as described above, the plug 32 is removed from the fixing member 27 to open the outer peripheral opening end of the first fixing hole 29 as shown in FIGS. Is rotated to the fully open position O, the first fixing hole 29 and the through hole 22 of the upper valve rod 10 are arranged in a straight line, and the fixing rod 33 is inserted into the first fixing hole 29 and the through hole 22. Thus, the valve body 3 is fixed at the fully open position O.

  After that, as shown in FIG. 8, the upper nut 35 is removed from the bolt 34, and the operating device 5 is removed from the fixing member 27 and the upper end portion of the upper valve stem 10 to expose the upper end portion of the upper valve stem 10. Next, the upper end portion of the upper valve stem 10 is inserted into the shaft hole portion 45 of the repair water-stopping member 41 having the O-rings 43 and 44, and as shown by the phantom line in FIG. 41 is fitted on the upper end of the upper valve stem 10 and attached to the upper surface of the fixing member 27 by means of mounting bolts 49.

  Thereafter, as shown in FIG. 2, the operating device 5 is placed on the upper surface of the fixing member 27, and the upper nut 35 is screwed into the bolt 34 to be tightened, whereby the operating device 5 is fixed to the fixing member 27 and the upper valve. The repair water stop member 41 is attached to the upper end portion of the rod 10 and is housed in the attachment space 47 in the operating device 5.

  Thus, the O-ring 43 stops water between the outer peripheral surface of the upper valve stem 10 and the inner peripheral surface of the water stop member main body 42, and the space between the upper surface of the fixing member 27 and the lower surface of the water stop member main body 42 is O. The water leaked by the ring 44 and having passed through the upper shaft sealing portion 15 as described above passes through the gap between the upper valve stem 10 and the fixing member 27, and then both the O-rings 43 of the repair water stop member 41, Water is stopped at 44. Thereby, it can repair easily and can stop the water leak to the exterior.

  Moreover, since the repair work as described above can be performed with the valve element 3 fixed at the fully open position O with the fixing rod 33, the water flowed through the pipe is maintained without stopping the flow of water in the pipe. Repair can be performed in the state of. Thereby, the valve body 3 does not rotate carelessly and closes rapidly, and the occurrence of a water hammer can be prevented. After the repair, the fixing rod 33 is removed from the first fixing hole 29 and the through hole 22, the fixing of the valve body 3 is released, the plug 32 is attached to the fixing member 27, and the first fixing hole 29 is attached. The outer peripheral opening end of is closed.

  In the above embodiment, as shown in FIG. 1, the repair water stop member 41 is attached to the water leakage from the upper shaft sealing portion 15, but the lower shaft sealing portion 56 is structurally the bottom O. Since the ring 55 does not slide on the outer peripheral surface of the lower valve stem 11, the bottom O-ring 55 is not damaged by the rotation of the lower valve stem 11, and almost no water leaks from the lower shaft seal portion 56. However, in the case of the lower shaft seal portion 56 configured such that the bottom O-ring 55 is in sliding contact with the outer peripheral surface of the lower valve stem 11, similarly, the repairing water-stopping member 41 is used to connect the lower shaft seal portion 56 to the outside. You may stop leaking water.

  In the above embodiment, the repair water-stopping member 41 is attached with the valve body 3 fixed at the fully open position O. However, the repair water-stopping member with the valve body 3 fixed at the fully closed position S. 41 can also be attached. In this case, as shown in FIG. 3, the valve body 3 is rotated to the fully closed position S, the second fixing hole 30 and the through hole 22 of the upper valve rod 10 are arranged in a straight line, and the fixing rod 33 is arranged. Is inserted into the second fixing hole 30 and the through hole 22 so that the valve body 3 is fixed at the fully closed position S.

(Second Embodiment)
In the second embodiment, as shown in FIG. 9, the repair water stop member 41 is sandwiched and held between the operating device 5 and the fixing member 27 provided in the valve box 2. The valve box 2, the operating device 5, the fixing member 27, and the repair water-stopping member 41 are connected by a plurality of bolts 34 and a plurality of pairs of upper and lower nuts 35 and 36.

According to this, the same operation and effect as the first embodiment can be obtained.
(Third embodiment)
In the third embodiment, as shown in FIG. 10, a cylindrical stand 58 is provided between the flange portion 19 of the valve box 2 and the fixing member 27. The inside of the stand 58 is sealed with a plurality of sealing members 59 such as O-rings.

According to this, the same operation and effect as the first embodiment can be obtained.
In each of the above embodiments, when water leakage occurs in the existing butterfly valve 1 provided in the pipe, the repair water stop member 41 is attached, but the O water rings 43 and 44 of the repair water stop member 41 are mounted. The water stop member main body 42 that is not in a state may be attached to the new butterfly valve 1 in advance.

  In this case, since the O-rings 43 and 44 are not attached to the water stop member main body 42, the operation torque at the time of opening and closing the butterfly valve 1 does not increase. When water leakage occurs, the controller 5 is removed, the water stop member main body 42 is removed, and the O rings 43 and 44 are fitted into the O ring grooves 46 and 48 of the water stop member main body 42, and then the water stop member main body 42. And the controller 5 may be attached.

In each of the above embodiments, an O-ring is given as an example of a seal body, but a packing or the like may be used.
In each of the above embodiments, as shown in FIG. 3, the first and second fixing holes 29 and 30 are formed so that the valve body 3 can be fixed at both the fully open position O and the fully closed position S. First and second fixing holes 29 and 30 are formed so that the valve body 3 can be fixed at a position other than the fully open and fully closed positions O and S (that is, a position between the fully open position O and the fully closed position S). Also good.

In each of the embodiments described above, the butterfly valve 1 is installed so that the valve stem 4 is in the vertical direction, but may be installed in the horizontal direction or in other oblique directions.
In each said embodiment, although the butterfly valve 1 was mentioned as an example of a valve, valves other than the butterfly valve 1 may be sufficient.

1 Butterfly valve (existing valve, valve)
2 Valve box 4 Valve stem 5 Controller 41 Repair water stop member 42 Water stop member main body 43 O-ring (seal body)
45 Shaft hole 46 O-ring groove (seal groove)
47 Mounting space (mounting part)

Claims (10)

A repair method for an existing valve that is opened and closed with an operating machine,
If water leaks from the shaft seal of the valve stem that penetrates the valve box, remove the operating device from the tip of the valve stem to expose the tip of the valve stem,
Fit a water stop member for repair on the tip of the valve stem,
A repair method for an existing valve, wherein an operating device is attached to the tip of a valve stem, and water leaking through the shaft seal is stopped by a repair water-stopping member. Fit a waterproofing member for repair to the tip of the valve stem,
2. The repair method for an existing valve according to claim 1, wherein the operating device is attached to the tip of the valve stem, and the water stop member for repair is housed inside the operating device. Fit a waterproofing member for repair to the tip of the valve stem,
2. A method for repairing an existing valve according to claim 1, wherein the operating device is attached to the tip of the valve stem, and the water stop member for repair is held between the operating device and the valve box. An existing valve repaired by the repair method according to any one of claims 1 to 3. A water stop member for repair used in the repair method according to any one of claims 1 to 3,
It has a water stop member body that can be externally fitted to the tip of the valve stem,
The water stop member body has a shaft hole portion into which the tip of the valve stem is inserted,
A waterproofing member for repair, wherein a sealing groove facing the shaft hole is formed on the inner peripheral surface of the waterproofing member main body over the entire circumference. 6. The water-stopping member for repair according to claim 5, wherein a ring-shaped sealing body is mounted in the sealing groove. The valve stem penetrates the valve box,
Water is shut off between the valve stem and the valve box at the shaft seal,
A water stop member for repair that can be attached to a valve that is opened and closed by an operating device connected to a valve stem,
It has a water stop member body that can be externally fitted to the tip of the valve stem,
The water stop member body has a shaft hole portion into which the tip of the valve stem is inserted,
A waterproofing member for repair, wherein a sealing groove facing the shaft hole is formed on the inner peripheral surface of the waterproofing member main body over the entire circumference. 8. The water-stopping member for repair according to claim 7, wherein a ring-shaped sealing body is mounted in the sealing groove. A valve having an attachment portion to which the repair water-stopping member according to claim 7 or 8 can be attached. A valve characterized in that the water-stopping member for repair according to claim 7 or 8 is attached to the attachment portion according to claim 9.

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