JP6715178B2 - Method for attaching and detaching valve operating device and valve device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for attaching and detaching a valve operating device and a valve device, and relates to a technique for preventing a valve rod from rotating in a water-passing state.

Conventionally, for example, what is described in Patent Document 1 relates to a method for repairing an existing valve, and when water leakage from the shaft sealing portion occurs, it is repaired in a water-passing state to stop the water leakage. This method removes the operating device from the tip of the valve stem, exposes the tip of the valve rod, fits a repair water stop member on the tip of the valve rod, and attach the operating device to the tip of the valve rod. The leakage water passing through the shaft sealing portion is stopped by the repair water stop member.

JP, 2016-84825, A

The above method is based on the following configuration. That is, a through hole penetrating in the diametrical direction is formed in the upper part of the valve stem, and a fixing member for fixing the valve stem around the axis so as not to be rotatable is provided between the flange part of the valve box and the flange part of the operating machine. It is provided. A fixing hole is formed in the fixing member in the diametrical direction, and the fixing rod is inserted into the fixing member so as to prevent the fixing member from rotating.

This method requires a fixing member to be interposed between the flange portion of the valve box and the flange portion of the operating machine, and is difficult to carry out in a valve device in which the fixing member is not attached in advance.

The present invention is to solve the above-mentioned problems, and a valve operating machine attachment/detachment method and a valve capable of easily attaching/detaching a valve operating machine of an existing valve device in a water-passing state without requiring a special configuration. The purpose is to provide a device.

In order to solve the above-mentioned problems, a method for attaching and detaching a valve operating device of the present invention includes a valve operating device that has a valve body that rotates around an axis of a valve rod that is inserted in a valve box and that rotationally drives the valve rod. In the valve device in which the valve actuator is attached to the valve stem, the valve operator is disengaged from the valve casing, and the valve actuator is separated from the valve casing by the maintenance clearance while maintaining the engagement between the valve actuator and the valve stem. It is characterized in that an engaging portion is formed on a valve rod with a processing tool through a maintenance gap, and a valve operating device is detached in a state where a locking member for preventing rotation of the valve rod is attached to the engaging portion.

In the method for attaching and detaching the valve operating device of the present invention, the valve operating device is separated from the valve box along the axial direction of the fastening bolts provided on the valve box flange of the valve box, and the locking member has a valve rod at one end side. It is characterized in that it is engaged with the joint portion so as not to rotate around the axis of the valve rod, and the other end side is locked around the axis of the valve rod by a fastening bolt.

The valve device of the present invention is a valve device having a valve body that rotates around an axis of a valve rod that is inserted in the valve box, and a valve operating device that rotationally drives the valve rod is attached to the valve body. Has a fastening bolt for fastening the valve operating device and the valve box to the valve box flange so that the valve box and the valve box can be coupled and separated from each other. Has a marking portion for maintaining the engagement state between the valve operating device and the valve rod, and separating the valve operating device from the valve box along the axial direction of the fastening bolt by a maintenance gap. In the state, it is exposed in the maintenance gap.

A valve device of the present invention is a valve device having a valve body that rotates around an axis of a valve rod that is inserted into a valve box, and a valve operating device that rotationally drives the valve rod is attached to the valve body. Has a fastening bolt for fastening the valve operating device and the valve box to the valve box flange so as to be coupled and separated from each other, and the valve rod has an engaging portion that engages with a locking member for preventing rotation of the valve rod. , The engagement portion maintains the engagement state between the valve operating mechanism and the valve rod while maintaining the engagement state between the valve operating mechanism and the valve rod along the axial direction of the fastening bolt by the maintenance clearance. It is characterized in that it engages with a locking member inserted through.

The partial cross section figure which shows the valve apparatus in embodiment of this invention. Partial cross-sectional view of the valve operating device of the valve device separated from the valve box by a maintenance gap Partial cross-sectional view showing a state where the valve rod of the valve device is machined through a clearance for maintenance. The spline disengagement prevention jig is shown, (a) is a front view, and (b) is a side view. Plan view with the same valve operating device omitted Front view showing the valve stem of the valve device The top view which abbreviate|omitted the valve operating device in other embodiment of this invention. The top view which abbreviate|omitted the valve operating device in other embodiment of this invention. The top view which abbreviate|omitted the valve operating device in other embodiment of this invention. The perspective view which abbreviate|omitted the valve operating device in the same embodiment.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, the valve device 10 is a rotary valve such as a butterfly valve or a ball valve.

The valve device 10 has a valve rod 12 that is inserted inside the valve box 11, and the valve rod 12 is joined to a valve body (not shown) arranged inside the valve box 11, and the head side of the valve box 11 is It projects to the outside. As shown in FIG. 6, the valve rod 12 has a spline 13 on its head. A valve operating device 20 is mounted on the valve box 11, and the valve operating device 20 rotationally drives the valve rod 12 to rotate the valve element around the axis of the valve rod 12. The valve operating device 20 has an operating device flange 21 corresponding to the valve housing flange 14, and a bolt hole 22 formed in the operating device flange 21 corresponds to the fastening bolt 15 attached to the valve housing flange 14. Then, the nut 16 that is screwed into the fastening bolt 15 is tightened so that the valve box flange 14 and the operating device flange 21 can be coupled and separated from each other. Here, a buried bolt is used as the fastening bolt 15, but a hexagonal bolt can also be used.

The valve operating machine 20 includes an input shaft 23, an output shaft 24, and a reduction gear mechanism 25 arranged between the input shaft 23 and the output shaft 24 therein, and an operating cap 26 is attached to the input shaft 23. The output shaft 24 is attached to the valve rod 12. The output shaft 24 has a spline hole 27 that fits into the head portion of the valve rod 12. The spline hole 27 meshes with the spline 13 of the valve rod 12, and the spline hole 27 and the spline 13 are in the axial direction of the valve rod 12. Meshes over the spline length. In the present embodiment, the valve rod 12 and the output shaft 24 are spline-joined, but key-joining can also be used.

The method for attaching and detaching the valve operating device 20 will be described below.

As shown in FIG. 1, while maintaining the valve device 10 fully open or in a water-flowing state with a predetermined opening, the nut 16 is loosened and removed from the fastening bolt 15, and the fastening between the valve box flange 14 and the operating device flange 21 is released. Then, the valve operating device 20 is set in a state in which it can be separated from the valve box 11. Then, the spline detachment preventing jig 30 shown in FIG. 4 is attached to the valve device 10 and the valve operating device 20. FIG. 5 shows a state in which the spline detachment preventing jig 30 is mounted, and the valve operating device 20 is omitted here.

The spline disengagement prevention jig 30 has a concave portion 31 on the inner side, and the concave portion 31 forms an arc shape following the outer peripheral edges of the valve box flange 14 and the operating device flange 21, and in the concave portion 31, the valve box flange 14 and the operating device flange are formed. It is externally fitted to the valve 21, and allows the operating device flange 21 to move in the axial direction of the valve rod 12 by a constant distance corresponding to the maintenance gap L.

Next, as shown in FIG. 2, while maintaining the engagement state between the spline hole 27 and the spline 13 to prevent the valve rod 12 and the valve body from rotating, the valve operating device 20 is moved in the axial direction of the fastening bolt 15. A space L for maintenance is separated from the valve box 11 along. At this time, the spline disengagement prevention jig 30 prevents excessive withdrawal of the valve operating device 20. The valve operating device 20 may be lifted by a human work, or may be lifted by using a lifting machine or the like. After separating the valve operating device 20 by the maintenance gap L, a gap is formed between the valve box flange 14 and the operating device flange 21. A holding material (not shown) may be inserted.

In this state, as shown in FIG. 3, a processing tool 40 for cutting, here a long drill, is inserted toward the valve rod 12 from the outside of the valve device 10 through the maintenance gap L, and the valve is processed by the processing tool 40. The rod 12 is provided with a bottomed hole 61 as the engaging portion 51 (see FIG. 5).

Next, as shown in FIG. 5, a locking pin 62 as a locking member 52 for preventing rotation of the valve rod 12 is inserted from the outside of the valve device 10 through a maintenance gap L, and one end side of the locking pin 62 is inserted. Is engaged with the bottomed hole 61 of the engaging portion 51 of the valve rod 12 so as not to rotate about the axis of the valve rod 12, and the other end of the locking pin 62 is fastened with the fastening bolt 15 to the axis of the valve rod 12. Lock around. At this time, a shim 63 is inserted between the fastening bolt 15 and the locking pin 62 for adjusting the gap, if necessary. Here, the locking pin 62 is locked by the fastening bolt 15, but the locking pin 62 can be locked by a human work, or instead of the fastening bolt 15, it is supported by a fixed object outside the device. It is also possible.

Then, the valve operating device 20 is attached/detached while the valve pin 12 is prevented from being rotated by the locking pin 62. That is, the valve operating device 20 is removed from the valve box 11 and returned after the maintenance work, or a new valve operating device 20 is installed.

In the present embodiment, the engaging portion 51 is formed on the valve rod 12 of the existing valve device 10, but the engaging portion 51 may be formed on the valve rod 12 in advance when the valve device 10 is newly installed. It is possible to form a marking portion for forming the engagement portion 51, for example, a punch hole, instead of the engagement portion 51.

Further, as shown in FIG. 7, it is possible to form a through hole 64 as the engaging portion 51, and by disposing the locking pin 62 so as to penetrate the through hole 64, the locking pin 62 can be removed. The two fastening bolts 15 can hold the both ends stably.

Furthermore, as shown in FIG. 8, it is possible to dispose a pin holder 65 instead of the shim 63. The pin holder 65 is arranged between the fastening bolts 15 and is fixed by the fastening bolts 15 around the axis of the valve rod 12. The pin holder 62 has grooves or holes 66 for holding pins at a plurality of locations along the axis of the valve rod 12, and the grooves or holes 66 for holding pins can hold the locking pin 62. The locking pin 62 can prevent the valve rod 12 from rotating at a position corresponding to the valve opening.

Further, as shown in FIGS. 9 and 10, as the engaging portion 51, the cut grooves 67 are formed on both sides of the valve rod 12, and the bifurcated locking pin 68 is inserted into the cut groove 67 to insert the valve rod 12 into the shaft. It is also possible to lock around the heart.

10 valve device 11 valve box 12 valve stem 13 spline 14 valve box flange 15 fastening bolt 16 nut 20 valve operating machine 21 operating machine flange 22 bolt hole 23 input shaft 24 output shaft 25 reduction gear mechanism 26 operating cap 27 spline hole 30 spline Detachment prevention jig 31 Recess 40 Processing tool 51 Engagement part 52 Locking material 61 Bottom hole 62 Locking pin 63 Shim 64 Through hole 65 Pin holding tool 66 Pin holding groove or hole 67 Cut groove 68 Bifurcated locking pin L maintenance gap

Claims (4)

In a valve device that has a valve element that rotates around the axis of a valve rod that is inserted in the valve box and that has a valve operating device that drives the valve rod to rotate, install the valve operating device and the valve box. Release the valve operating device from the valve box while maintaining the engagement state between the valve operating device and the valve stem, and form the engaging part on the valve rod with the processing tool through the maintenance gap. A method of attaching and detaching a valve operating device, characterized in that the valve operating device is attached and detached in a state in which a locking member for preventing rotation of a rod is attached to an engaging portion. The valve operating device is separated from the valve box along the axial direction of the fastening bolts provided on the valve box flange of the valve box, and the locking member has one end that rotates around the axis of the valve shaft around the engaging part of the valve shaft. The valve operating machine mounting/demounting method according to claim 1, wherein the valve operating machine is fixedly engaged and the other end is locked around the shaft center of the valve rod by a fastening bolt. A valve device having a valve body that rotates around an axis of a valve rod inserted in a valve box, and a valve operating device that rotationally drives the valve rod is attached to the valve body,
The valve box has a fastening bolt for fastening the valve operating machine and the valve box to the valve box flange so that they can be coupled and separated.
The valve stem has a marking portion for forming an engaging portion that engages with a locking member for stopping rotation of the valve rod,
The marking part is exposed in the maintenance gap when the valve actuator is separated from the valve box along the axial direction of the fastening bolt by the maintenance gap while maintaining the engagement between the valve actuator and the valve rod. A valve device characterized by: A valve device having a valve body that rotates around an axis of a valve rod inserted in a valve box, and a valve operating device that rotationally drives the valve rod is attached to the valve body,
The valve box has a fastening bolt for fastening the valve operating machine and the valve box to the valve box flange so that they can be coupled and separated.
The valve stem has an engaging portion that engages with a locking member for stopping rotation of the valve rod,
The engaging portion is provided in the maintenance gap when the valve operating device is separated from the valve box along the axial direction of the fastening bolt by the maintenance gap while maintaining the engagement state between the valve operating device and the valve rod. A valve device, characterized in that the valve device engages with the inserted locking member.

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