JP2012207719A - Non-cutoff water supply valve element replacing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-cutoff water supply valve element replacing device capable of accurately positioning, and capable of removing an old gasket.SOLUTION: The non-cutoff water supply valve element replacing device includes a casing 20 water-tightly installed in a pipe conduit 7 by enclosing a valve 1 having a cover 3 attachable and detachable to a valve casing 2, a cover fixing device 24 for protruding and retreating over an action position for pressing the cover 3 to the valve casing 2 side by abutting on the cover 3 and a retreat position from the cover 3, a pull-up bar 261 for moving over an installation position for allowing the cover 3 to abut on the valve casing 2 and a separate position for separating the cover 3 from the valve casing 2 by holding the cover 3, and a knife gate valve 23 for partitioning the inside of a casing into an upper closed space 201 and a lower closed space 202. The casing 20 is constituted of an upper casing 21 forming the upper closed space 201 for storing the cover 3 and a lower casing 22 forming the lower closed space 202 for storing the valve casing 2 of separating the cover 3, and the upper casing 21 has an opening 212 capable of taking out the cover 3 and an upper flange 213 capable of water-tightly sealing the opening 212.

Description

  The present invention relates to a continuous water valve body exchange device, and relates to a technique for replacing a valve body of a gate valve in a continuous water state.

Conventionally, as a technique for exchanging a gate valve such as a soft seal valve in an uninterrupted state of passing water through a pipeline, for example, there is one described in Patent Document 1.
This target on-off valve has a structure in which a lid supporting a valve shaft and a valve box are mounted and fixed, and a flange of the lid and a flange of the valve box opening are fixed with bolts and nuts. The valve body and the valve shaft can be taken out of the valve.

  The valve body replacement device for repairing and exchanging the valve body and the valve shaft of this on-off valve with constant water is such that the casing disposed so as to cover the on-off valve can be fixed in a watertight manner to the pipe line, and the open part of the casing An attachment / detachment device that is fixed in a watertight manner includes a chuck device and a work valve that can lift a closed space, a valve shaft, and the like. The holding device provided in the casing locks the lid and the valve box in a state where the opening is liquid-tightly closed, and the engagement / disengagement thereof can be operated from the outside.

  With this configuration, when the valve body is replaced, the casing is disposed so as to cover the on-off valve, and the casing is fixed in a watertight manner to the pipeline. Next, the lid and the valve box are locked in a state where the opening is liquid-tightly closed by the holding device, and the bolt and nut are removed in this state. Next, the attachment / detachment device is fixed to the casing, and the holding device is operated from the outside to release the locking between the lid and the valve box. Next, the valve shaft and the like are pulled up to the closed space by the chuck device, and after the closed space is closed by the work valve, the detachable device is removed and the valve shaft and the like are taken out together with the lid.

  And the operation procedure mentioned above is performed in reverse order, and a new valve stem etc. are mounted in a valve box with a new lid.

JP 2007-177945 A

  However, in the above configuration, when positioning a new lid on the valve box, the position of the lid relative to the valve box is not accurately determined due to manufacturing tolerances during casting and painting, and the lid and valve are inaccurate. When the box is locked by the holding device, the bolt hole of the lid flange and the bolt hole of the valve box flange do not match, making it impossible to insert the bolt, and assembling the lid on the valve box after replacement Can not be.

  In addition, a gasket is interposed between the flange of the lid and the flange of the valve box.If the gasket is displaced when the valve stem or the like is removed together with the lid, the position of the gasket in the sealed space under water pressure It was difficult to correct.

  The present invention solves the above-mentioned problems, and in a sealed space under water pressure, the valve box and the lid can be easily temporarily fixed while visually observing, and the manufacturing tolerance is reduced when the lid is attached to the valve box. It is an object of the present invention to provide a continuous water valve body exchange device capable of accurately positioning without causing a positioning failure and removing old gaskets.

  In order to solve the above-mentioned problems, the continuous water valve body exchanging device of the present invention surrounds a valve having a valve box connected to a pipe line and a lid part detachable from the valve box, and is attached to the pipe line in a watertight manner. A casing, a lid fixing means that comes and goes over a position where the lid comes into contact with the lid and presses the lid toward the valve box, and a retracted position separated from the lid; and the lid holds the lid and the lid is the valve box A lid part detaching means that moves over a mounting position that contacts the lid part and a detaching position in which the lid part separates from the valve box, and a partition means that partitions the closed space in the casing into an upper closed space and a lower closed space, The upper casing is made up of an upper casing that houses an upper closed space that houses a lid that has been moved to the release position by the lid detaching means, and a lower casing that houses a lower closed space that houses a valve box from which the lid has been removed. The opening that can be taken out and the opening Closely and having a sealable opening and closing unit.

  In the continuous water valve body exchange device of the present invention, the lid fixing means has a pressing member that presses the lid flange of the lid against the valve box flange of the valve box, and the wedge is wedged on the tip side where the pressing member contacts the lid flange. It has the part.

In the continuous water valve body exchange device of the present invention, the casing has a window portion through which the valve can be visually recognized.
In the continuous water valve body exchange device of the present invention, the casing holds the seal removing member for removing the sealing material interposed between the lid flange of the lid portion and the valve box flange of the valve box in a watertight manner, and the seal removing member Is characterized in that it moves back and forth over an engagement position that engages with the sealing material on the valve box flange and a retracted position that is separated from the valve box flange.

In the continuous water valve body exchanging device of the present invention, the lid part detaching means has a fixing means for holding the state in which the lid part comes into contact with the valve box at the mounting position.
In the continuous water valve body exchanging device of the present invention, the lid part has a positioning pin that is inserted into a guide hole provided in the valve box and positions the lid part on the valve box.

  As described above, according to the present invention, when the lid portion is detached, the lid portion fixing means presses the lid portion toward the valve box side so that the bolt and nut for fixing the lid portion and the valve box are It can be removed without being affected by the force received from the water pressure. When the lid part is detached or attached, the state in which the lid part comes into contact with the valve box is held by the fixing means of the lid part detaching means, so that the lid part fixing means can be easily operated between the operating position and the retracted position. In a sealed space under water pressure, the valve box and lid can be easily temporarily fixed while visually observing through the window. When the lid is attached to the valve box, the lid is positioned on the valve box with a positioning pin. By doing so, there is no positioning failure due to manufacturing tolerance, and the old gasket can be removed by the seal removing member.

The front view which shows the continuous water valve body exchange apparatus in embodiment of this invention The state which attached the lower casing in the embodiment is shown, (a) is a partial section top view, (b) is a section view The principal part enlarged view of the flange fixing device in the embodiment Sectional drawing which shows the state which mounted | wore the upper casing and the lower casing in the same embodiment The state in which the cover part in the embodiment is detached is shown, (a) is a plan view, and (b) is a sectional view. Sectional drawing which shows the state which accommodated the cover part in the same embodiment in the upper casing Sectional drawing which shows the state which took out the cover part in the same embodiment from the upper casing The top view which shows the gasket which remains on the valve box flange in the same embodiment The gate valve of the exchange object in embodiment of this invention is shown, (a) is a top view, (b) is a front view

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 9, the target valve of the present invention is, for example, a soft seal valve 1 of a gate valve, and the soft seal valve 1 includes a valve box 2 and a lid portion 3. The lid flange 5 of the lid 3 is fixed so as to be removable with bolts and nuts 6 of fasteners, and the valve box 2 is connected to the pipe line 7. The lid portion 3 rotatably holds the valve shaft 8, the valve shaft 8 is screwed into the valve body 9, and the valve shaft 8 and the valve body 9 are assembled to the lid portion 3. Positioning for positioning the lid 3 to the valve box 2 by removing a part of the bolt 6 and the nut 6 for connecting the lid 3 and the valve box 2 and using the bolt hole of the valve box 2 as the guide hole 10. A pin 11 is attached to the lid 3. A gasket 12 serving as a sealing material is interposed between the lid flange 5 of the lid part 3 and the valve box flange 4 of the valve box 2, and as shown in FIG. The gasket 12 remains on the valve box flange 4.

  As shown in FIGS. 1 and 4, the continuous water valve body exchanging device 100 of the present invention has a casing 20 that surrounds the soft seal valve 1 and is watertightly attached to a pipe line 7. The upper casing 21 forms a space 201 and the lower casing 22 forms a lower closed space 202, and the lower casing 22 has a bottom casing 220 disposed below the pipe line 7. Between the lower opening 211 of the upper casing 21 and the upper opening 221 of the lower casing 22, a knife gate valve 23 serving as a partitioning means for partitioning the upper closed space and the lower closed space of the casing 20 is interposed.

  The upper casing 21 is composed of a short tube, and the upper closed space 201 forms a space in which the lid portion 3 can be accommodated. The upper opening 212 and the lower opening 211 of the upper casing 21 are opposed in the axial direction of the short tube, And it has both the apertures which can take out the cover part 3. FIG. An upper flange 213 is fixed by a bolt and a nut 214 of a fastener so as to be detachable as an opening / closing portion capable of sealing the upper opening 212 in a watertight manner.

  The lower closed space 202 of the lower casing 22 forms a space in which the valve box 2 from which the lid 3 is detached can be accommodated, and the upper opening 221 of the lower casing 22 has a diameter through which the lid 3 can pass. It has the same diameter as the upper opening 212 and the lower opening 211 of the casing 21.

The lower casing 22 is provided with a window portion 222 through which the soft seal valve 1 can be visually recognized, and the window portion 222 is made of a transparent acrylic plate or the like.
The lid fixing device 24 for temporarily fixing the lid 3 includes a rod-like pressing member 241 disposed through the wall of the lower casing 22, and the pressing member 241 in the wall of the lower casing 22 in a watertight manner. It has a pressing member water stop portion 242 that is freely held, and a wedge portion 243 provided at the tip of the pressing member 241, and the wedge portion 243 abuts against the lid portion 3 so that the lid portion 3 faces the valve box 2 side. The position of pressing and the retracted position where the wedge portion 243 is separated from the lid portion 3 are retracted. In this embodiment, the pressing member 241 moves in and out in the horizontal direction, but it can also move in and out in an obliquely upward direction.

  The pressing member 241 and the wedge portion 243 can rotate about an axis along the direction of extending and retracting between the operating position and the retracted position, that is, around the axis of the pressing member 241. With this configuration of the lid fixing device 24, the wedge portion 243 rotates around the axis of the pressing member 241 even when the lid flange 5 has an elliptical shape other than a circle as in the present embodiment. It is possible that when the wedge portion 243 comes into contact with the lid flange 5 of the lid portion 3, the wedge portion 243 rotates so as to follow the shape of the peripheral edge of the lid flange 5, and the working surface of the wedge portion 243 is changed. The posture comes into contact with the periphery of the lid flange 5 without difficulty, and the wedge portion 243 can be smoothly pushed up to the upper surface of the lid flange 5.

  The lower casing 22 is provided with a rod-like seal removing member 251 that penetrates the wall of the lower casing 22, and the seal removing member 251 is watertight, and can be moved out and out and rotated by a seal removing member water stop 252. The seal removing member 251 has a hook-like portion 253 that is bent in a circular shape at the tip and can be engaged with the gasket 12, and an engagement position where the seal removing member 251 engages with the gasket 12. And the retracted position away from the valve box flange 4.

  The upper flange 213 of the upper casing 21 is provided with a lifting rod 261 that penetrates the upper flange 213 as a lid detaching means, and the lifting rod 261 is held in a watertight and vertically movable manner by the lifting rod water stop 262. is doing. A box portion 263 that engages with the head portion 801 of the valve shaft 8 is provided at the lower end of the lifting rod 261, and the head portion 801 and the box portion 263 can be connected by a connecting bolt 264. The lifting rod 261 moves up and down between a mounting position where the lid portion 3 is held by the box portion 263 and the lid portion 3 contacts the valve box 2 and a disengagement position where the lid portion 3 is separated from the valve box 2.

  An upper plate 265 serving as a fixing means is fixed to the upper end of the lifting rod 261 with fixing bolts 266, and the upper plate 265 is arranged with holes on both sides being inserted into the cutting bolts 267. The dimensioning bolt 267 is fixed to the upper flange 213 so as to be detachable, and the upper plate 265 is tightened downward by a fixing nut 268 that is threadedly engaged with the dimensioning bolt 267, so that the lid is removed via the lifting rod 261. The state in which the portion 3 is in contact with the valve box 2 is maintained.

  A drainage unit 27 is provided on the upper plate 265. The drainage unit 27 includes a drainage pipe 271 having one end opened inside the upper plate 265 and the other side communicating with the outside of the casing 20, and an on-off valve 272 interposed in the middle of the drainage pipe 271.

  Hereinafter, the operation of the above-described configuration will be described. As shown in FIG. 9, the bolts and nuts 6 that connect the lid 3 and the valve box 2 are partly removed, and the bolt holes of the valve box 2 are used as guide holes 10, and the positioning pins 11 are inserted into the bolt holes of the lid 3. Driving is performed, and the positioning pin 11 is inserted into the guide hole 10.

  As shown in FIG. 2, the bottom casing 220 is disposed below the pipe line 7 and the valve box 2 to fix the lower casing 22 to the pipe line 7 in a watertight manner. As shown in FIG. 3, the pressing member 241 of the lid fixing device 24 is pushed out to the upper surface of the lid flange 5, and the lid 3 is pressed against the valve box 2 by the wedge portion 243. In this state, remove all the bolts and nuts 6. At this time, by pressing the lid portion 3 toward the valve box 2 with the wedge portion 243, the bolt and nut 6 for fixing the lid portion 3 and the valve box 2 are affected by the force received from the water pressure in the valve. It can be easily removed without

  Next, as shown in FIG. 4, the lifting rod 261 is attached to the valve shaft 8, and the box portion 263 of the lifting rod 261 is engaged with the head portion 801 of the valve shaft 8 and connected by the connecting bolt 264. The knife gate valve 23 is attached to the upper end of the lower casing 22, the upper casing 21 is connected to the knife gate valve 23, and the upper flange 213 is attached to the upper casing 21.

  Then, as shown in FIG. 1, the dimensioning bolt 267 is fixed to the upper flange 213, inserted into the dimensioning bolt 267, the upper plate 265 is disposed at the upper end of the lifting rod 261, and the upper plate 265 is fixed with the fixing bolt 266. Fix to the lifting rod 261. The upper plate 265 is tightened downward by a fixing nut 268 that is screwed to the dimensioning bolt 267, so that the state in which the lid portion 3 is in contact with the valve box 2 through the lifting rod 261 is maintained. Finally, the drainage unit 27 is attached to the upper plate 265.

  Next, as shown in FIG. 5, the pressing member 241 of the lid fixing device 24 is retracted to release the pressing of the lid 3 by the wedge portion 243. At this time, since the upper plate 265 is pressed by the fixing nut 268 and the state where the lid 3 is pressed against the valve box 2 via the lifting rod 261 is maintained, the pressing member 241 can be easily operated over the operating position and the retracted position. .

  When the opening / closing valve 272 is opened and the fixing nut 268 is loosened, the lid portion 3 is lifted by the water pressure inside the valve box 2, and water flows out between the lid flange 5 and the valve box flange 4. This water is left until it flows to the outside through the drain pipe 271 to stabilize the internal pressure of the casing 20.

  Next, as shown in FIGS. 6 and 8, the seal removal member 251 is moved to the engagement position where it engages with the gasket 12, and the seal is removed from the gasket 12 interposed between the lid flange 5 and the valve box flange 4. With the hook-like portion 253 of the member 251 engaged, the lifting rod 261 is pulled upward to house the lid portion 3 in the upper closed space 201 of the upper casing 21. The gasket 12 retracts the seal removing member 251 from the valve box flange 4 and leaves it inside the lower casing 22. The knife gate valve 23 is closed to partition the upper closed space 201 and the lower closed space 202.

Next, as shown in FIG. 7, all bolts and nuts 214 are removed, and the lid 3 is taken out integrally with the upper flange 213.
Thereafter, the valve body 9 as the replacement target part is replaced, and the above-described procedure is reversed to mount the lid 3 on the valve box 2. At this time, the valve box 2 and the lid 3 can be temporarily fixed with the pressing member 241 by visual observation through the window 222, and the lid 3 is positioned on the valve box 2 with the positioning pin 11. By doing so, the positioning defect caused by the manufacturing tolerance is eliminated.

DESCRIPTION OF SYMBOLS 1 Soft seal valve 2 Valve box 3 Lid part 4 Valve box flange 5 Lid flange 6 Bolt and nut 7 Pipe line 8 Valve shaft 801 Head 9 Valve body 10 Guide hole 11 Positioning pin 12 Gasket 100 Non-continuous water valve body changer 20 Casing 201 Upper closed space 202 Lower closed space 21 Upper casing 211 Lower opening 212 Upper opening 213 Upper flange 214 Bolt and nut 22 Lower casing 220 Bottom casing 221 Upper opening 222 Window 23 Knife gate valve 24 Lid fixing device 241 Press Member 242 Pressing member water stop part 243 Wedge part 251 Seal removing member 252 Seal removing member water stopping part 253 Hook-like part 261 Lifting bar 262 Lifting bar water stopping part 263 Box part 264 Connection bolt 265 Upper plate 266 Fixing bolt 267 Turn bolts 268 fixing nut 27 drainage unit 271 discharge pipe 272 off valve

Claims (4)

  A casing that surrounds a valve having a valve box connected to the pipe line and a lid part that can be attached to and detached from the valve box, and a casing that is watertightly attached to the pipe line, and an action that abuts the lid part and presses the lid part toward the valve box side The lid fixing means that moves in and out between the position and the retracted position that is separated from the lid, the mounting position where the lid is held while the lid is in contact with the valve box, and the separation position where the lid is separated from the valve box are moved. An upper closed space for storing the lid part moved to the disengagement position by the lid part detaching means, and a lid part detaching means for partitioning the closed space in the casing into an upper closed space and a lower closed space. The upper casing and the lower casing that forms the lower closed space for storing the valve box from which the lid part has been removed, and the upper casing has an opening that allows the lid part to be taken out and an opening / closing part that can seal the opening in a watertight manner. Continuous water valve body characterized by having Conversion apparatus.   The lid fixing means has a pressing member that presses the lid flange of the lid against the valve box flange of the valve box, and the pressing member has a wedge portion on the tip side where the pressing member comes into contact with the lid flange. The constant water valve body exchange apparatus as described in.   The casing is provided with a water valve body replacement device according to claim 1, wherein the casing has a window portion through which a valve can be visually recognized.   The casing holds the seal removing member that removes the sealing material interposed between the lid flange of the lid part and the valve box flange of the valve box in a watertight manner, and the seal removing member is engaged with the sealing material on the valve box flange. The continuous water valve body replacement device according to claim 1, wherein the water valve body is moved back and forth across an engaging position and a retracted position separated from the valve box flange.

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