JP2014163405A - Opening/closing operation jig for manually operated valve and valve closing method for closing manually operated valve by using opening/closing operation jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing operation jig that allows an opening/closing operation to be constantly performed at a fixed torque value even if a manually operated valve has a manual-type round handle, and to provide a valve closing method that allows the manually operated valve to be closed at a fixed closing torque value by using the opening/closing operation jig.SOLUTION: Provided is an opening/closing operation jig 16 used for a manually operated valve 1 that includes a valve stem 2 for opening/closing a valve by rotational operation and a manual-type round handle 4 for rotational operation attached to the valve stem 2. The opening/closing jig 16 includes a jig body 17 having engagement members 18 which can be rotationally operated by being engaged to the manual-type round handle 4. The jig body 17 includes a rotational operation part 20 attached, in an engaged and fitted state to the manual-type round handle 4, to a torque wrench 21 positioned on a rotational shaft center L of the valve stem 2. Also provided is a valve closing method for closing the manually operated valve 1 by using the jig 16.

Description

  The present invention uses a valve stem that opens and closes a valve by a rotation operation, a manually operated valve opening / closing operation jig having a manual operation round handle attached to the valve rod, and the jig. The present invention relates to a valve closing method for closing a manually operated valve.

A manually operated valve having a manually operated round handle is based on the premise that the valve is opened and closed by manually rotating the round handle. However, when opening and closing the valve by artificial rotation operation, the torque value at the time of opening and closing inevitably varies depending on the worker, and even for the same worker, depending on the installation status of the manually operated valve, For example, there are a case where the round handle is located at a place where it is easy to rotate and a place where it is difficult to rotate, and it is very difficult to always open and close with a constant torque value.
In order to solve such a problem, a valve that opens and closes using a torque wrench has been proposed, and an open / close monitoring system that uses such a valve has also been proposed (see, for example, Patent Document 1).

JP-A-10-299941

However, in the prior art described in Patent Document 1, it is necessary that the target valve itself is provided with a rotation operation unit for a torque wrench. Therefore, the manually operated valve having the above-described manually operated round handle. It is impossible to apply it as it is.
Also, depending on the type of valve, in order to completely eliminate the situation where the valve itself is damaged, a valve (for example, an odor There is a valve for supplying and shutting off the agent. In such a valve, manual operation by human being is fundamental, and some standardization of operation is required for the closing torque value. However, an operation jig and valve closing method suitable for such operation are required. Was not known.

  The present invention pays attention to such problems, and its purpose is to provide an open / close operation jig that can always be opened / closed at a constant torque value even with a manually operated valve having a manual round handle. The present invention also provides a valve closing method capable of closing a manually operated valve with a constant closing torque value using the opening / closing operation jig.

In order to achieve the above object, an open / close operation jig for a manually operated valve according to the present invention has a valve rod for opening and closing the valve by a rotation operation, and a manually operated round handle for rotation operation attached to the valve rod. An open / close operation jig for a manually operated valve,
The characteristic configuration includes a jig main body having an engaging member that can be rotated by engaging with the manual type round handle, and the jig main body is engaged with the manual type round handle. A rotation operation part for mounting a torque wrench located on the rotation axis of the valve stem is provided.

According to the above characteristic configuration, by engaging the engaging member with the manual type round handle and attaching the jig body to the manual type round handle, the rotation operation part for attaching the torque wrench is located on the rotational axis of the valve stem. Located in. Therefore, by opening and rotating a torque wrench fitted to the rotation operation portion, the opening / closing operation can be performed with a constant torque value set by the torque wrench.
As a result, despite the fact that the valve is a manually operated valve having a manually operated round handle, there is no difference in the torque value at the time of opening and closing by the operator, and even if the round handle is easy to rotate or the rotating operation Even when it is located at a difficult position, it can always be opened and closed with a constant torque value.

  The open / close operation jig for a manually operated valve according to the present invention is further characterized in that the engaging member is a plurality of engaging protrusions extending and engaged with the inside of the manually operated round handle, and the rotation The operating portion is provided on the opposite side of the engaging projection with the jig body interposed therebetween.

According to the above-described characteristic configuration, a torque wrench can be mounted by engaging and mounting the jig main body to the circular handle so that a plurality of engaging protrusions as engaging members extend to the inside of the manual circular handle. Is located outside the round handle.
Therefore, the torque wrench can be easily fitted to the rotation operation unit, and the rotation operation using the torque wrench is easy, so that the rotation operation can be performed reliably.

  The open / close operation jig for the manually operated valve according to the present invention is further characterized in that the jig body extends outward from the outer periphery of the manually operated round handle in a state of engagement with the manually operated round handle. It is in that it has a manual lever for rotating operation.

According to the above characteristic configuration, the torque wrench and the manual lever for rotation operation can be used properly to perform the opening / closing operation.
That is, depending on the installation state of the manually operated valve, it may be easier to rotate the manual lever than the torque wrench. Under such circumstances, the opening and closing operation can be performed with a manual lever in the initial stage and the opening and closing operation can be performed with a constant torque value using a torque wrench in the final stage. Can be performed.

Further, a valve closing method according to the present invention for achieving the above object is a valve closing method for closing a manually operated valve using the open / close operation jig described in any one of the above-described characteristic configurations,
The characteristic configuration includes a first step of manually rotating the manually operated round handle to close the manually operated valve, and the opening and closing of the manually operated round handle after the first step. Including a second step of fitting a torque wrench to the rotary operation portion of the operation jig and closing the manually operated valve until the torque wrench reaches a predetermined closing torque value that is set in advance as a closing confirmation torque value. In the point.

For example, if the valve to be closed is installed in the piping for odorous gas flow or the piping of a city gas plant, a closing torque value is required if an automatic open / close electromagnetic valve is used as the valve. When the valve is closed, an excessive pressing force is applied to the valve seat every time the valve is closed, the valve may be damaged, and odorous gas may leak to the outside.
From this point of view, a manually operated valve having a manually operated round handle is generally used in piping for passing odorous gas or city gas plant piping, and the circular handle is manually rotated. The principle is to close the valve.
However, when the valve is closed by an artificial rotation operation, as described above, there is a difference in the closing torque value depending on the worker, or the round handle is easily rotated depending on the installation status of the manually operated valve. In some cases, it is difficult to perform a rotation operation, and it is difficult to always close with a constant closing torque value.

According to the above characteristic configuration, even a manually operated valve under such a special condition can always be closed with a constant closing torque value using the opening / closing operation jig.
That is, in the first step, the manually operated round handle is artificially rotated to close the manually operated valve. For example, the valve with a closing torque value higher than necessary, such as an automatic open / close electromagnetic valve. Closing is avoided.
In the second step, after completion of the first step, a torque wrench is fitted to the rotation operation portion of the opening / closing operation jig engaged with and attached to the manual type round handle, and the torque value for closing confirmation is preliminarily determined by the torque wrench. Since the manually operated valve is closed until the constant closing torque value determined as follows, there is no difference in the closing torque value depending on the operator even though the manually operated valve has a manually operated round handle. In addition, even when the round handle is located at a position where rotation is easy or difficult to rotate, it is possible to always close with a constant closing torque value.

  A further characteristic configuration of the valve closing method according to the present invention is that the manually operated valve is a city gas valve provided in a fluid flow piping of a city gas plant.

  According to the above-mentioned characteristic configuration, the city gas valve provided in the piping of the city gas plant through which natural gas or odorant (odorant gas) flows can be reliably and manually fixed by a constant closing torque value. Can be closed.

  A further characteristic configuration of the valve closing method according to the present invention is that the city gas valve is an odorant valve provided in an odorant passage pipe.

  According to the above-described characteristic configuration, the odorant valve provided in the odorant passage pipe through which the odorant flows is reliably fixed at a constant closing torque value by manual operation of the city gas plant. Can be closed.

  A further characteristic configuration of the valve closing method according to the present invention is that the constant closing torque value is 20 to 24 N · m, and the maximum settable torque value of the torque wrench is 40 N · m.

  According to the above-described characteristic configuration, as is apparent from the experimental results described later, in the odorant valve provided in the odorant passage pipe whose odorant fluid pressure is 4.0 MPa or less, By setting the torque value to 20 to 24 N · m, the odorant valve can be reliably closed with the minimum necessary torque value, and the maximum settable torque value of the torque wrench is set to 40 N · m. Thus, it is possible to reliably avoid damaging the valve by applying an excessive torque value more than necessary.

Front view of a manually operated valve with an open / close operation jig Open / close operation jig and torque wrench perspective view Top view of the open / close operation jig and manual round handle Schematic configuration diagram of city gas plant Chart showing experimental results

Embodiments of an open / close operation jig for a manually operated valve according to the present invention and a valve closing method for closing the manually operated valve using the jig will be described with reference to the drawings.
As shown in FIG. 1, a manually operated valve 1 to be used by an opening / closing operation jig of the present invention includes a valve rod 2 that opens and closes a valve by a rotation operation around its rotation axis L, and the valve rod 2. On the other hand, it is a valve having a manual round handle 4 for rotating operation attached via a plurality of connecting rods 3.
Since such a manually operated valve 1 is conventionally known and will not be described in detail, a valve seat 6 is provided in the valve box 5, and for example, when the valve rod 3 is rotated clockwise, the valve rod 3 A valve body 7 provided at the tip of the valve seats on the valve seat 6, shuts off the inlet-side flow path 8 and the outlet-side flow path 9 and closes the valve to prevent fluid flow. On the contrary, when the valve rod 3 is rotated counterclockwise, the valve body 7 is separated from the valve seat 6 to allow the fluid passages 8 and 9 to communicate with each other.

As will be described in detail later, the manually operated valve 1 is provided in a fluid flow piping of a city gas plant, in other words, a fluid flow piping that needs to reliably prevent leakage to the outside.
Therefore, in the manually operated valve 1 of FIG. 1, the packing housing recess 10 is provided in the valve box 5 portion through which the valve stem 2 penetrates, and the space between the valve stem 2 and the valve box 5 is kept airtight in the recess 10. A large number (four in this embodiment) of gland packings 11 are accommodated and pressed by the pressing member 12.
The pressing member 12 is a cylindrical member that is fitted into the packing housing recess 10 in a state where the valve stem 2 penetrates, and a pressing member 13 that forcibly presses the pressing member 12 toward the gland packing 11 is provided. A bolt 14 a is passed through the pressing member 13. The bolt 14 a is pivotally connected to the valve box 5 via a pivot shaft 15, and the pressing member 12 presses the gland packing 11 via the pressing member 13 by tightening a screw nut 14 b to the bolt 14 a. The valve stem 2 and the valve box 5 are kept airtight so that the entire manual operation valve 1 is kept airtight.

As shown in FIGS. 1 to 3, the opening / closing operation jig 16 for which such a manually operated valve 1 is used has a plate-like or rod-like metal jig body 17, and the jig body As shown in FIGS. 1 and 3, one side surface 17 extends to the inside of the round handle 4 and is connected to the connecting rod 3 while being placed on the manual round handle 4 of the manually operated valve 1. A plurality of (two in this embodiment) engaging members 18 as metal engaging protrusions 18 are provided to be engaged.
On the opposite side of the engagement protrusion 18, that is, on the opposite side of the engagement protrusion 18 across the jig body 17, a metal operation member 19 is projected, and the operation member 19 includes a torque wrench. A fitting recess 20 is provided as a rotation operation portion into which the fitting projection 22 of 21 is fitted and mounted. The jig body 17 itself is longer than the outer diameter of the manual round handle 4 and is configured such that both ends thereof extend outward from the outer periphery of the round handle 4 while being placed on the round handle 4. Both ends thereof are configured to function as a manual lever 23 for rotating operation.
The manual lever 23 may be provided with only one manual lever 23 such that only one end of the jig body 17 extends outward from the outer periphery of the round handle 4. It can also be carried out without 23. In that case, the both ends of the jig body 17 are extended to such an extent that they can be installed on the round handle 4, so that the open / close operation jig 16 can be engaged and mounted on the round handle 4 in a stable state.

The manually operated valve 1 is provided, for example, in a piping for fluid flow in a city gas plant as shown in FIG.
The city gas plant includes an LNG tank 24 for storing LNG, a vaporization facility 25 for vaporizing LNG, an odorant tank 26 for storing odorants of thiols, and an odorant mixed in natural gas after vaporization. An odorant mixing unit 27 and the like are provided. An odorant passing pipe 28 for passing the odorant in the odorant tank 26 to the odorant mixing unit 27 is conveyed from the upstream side toward the downstream side by a pump 29 and a pressure gauge. 30, an odorant valve V1, a flow meter 31, an odorant valve V2, and the like are provided. A valve V3 is connected to a pipe 32 that communicates the LNG tank 24 and the vaporizing equipment 25, and a valve V4 is conveyed to a pipe 33 that communicates the vaporizing equipment 25 and the odorant mixing unit 27. The pipe 34 is also provided with a valve V5, and these valves V1 to V5 are all city gas valves, and the above-described manually operated valves 1 are all used.

Next, a method for using the opening / closing operation jig 16 according to the present invention will be described, and a valve closing method for closing the manually operated valve 1 using the opening / closing operation jig 16 will be described.
In principle, the valve is closed manually by manual operation, and in order to adjust the closing torque value at the final stage of closing, the opening / closing operation jig 16 is used as an auxiliary to complete the closing. To complete the closing of the valve 1, the opening / closing operation is performed so that the engagement protrusion 18 of the opening / closing operation jig 16 is engaged with the connecting rod 3 of the manual round handle 4, as shown in FIGS. 1 and 3. The jig 16 is engaged and attached to the manual round handle 4. In the engaged mounting state, the manual lever 23 for rotating operation extends outward from the manual type round handle 4, and the fitting recess 20 provided in the operating member 19 is on the rotational axis L of the valve stem 5. Therefore, the manual lever 23 is grasped and artificially closed, and then the torque wrench 21 is used, and the fitting protrusion 22 of the torque wrench 21 is fitted into the fitting recess 20 to perform the closing operation.
That is, since the torque wrench 21 can freely set the torque value at the time of operation, the torque wrench 21 can be set to an optimal constant closing operation torque value according to the target manually operated valve 1. Therefore, in the final stage of the closing operation, the manually operated valve 1 having the manually operated round handle 4 is obtained by engaging and mounting the opening / closing operation jig 16 on the manually operated circular handle 4 and closing the torque with the torque wrench 21. However, the closing operation can always be performed with a desired torque value.

A valve closing method for closing the valves V1 to V5 provided in the fluid flow pipes 28 and 32 to 34 in the city gas plant shown in FIG. A first step of closing the manually operated valve 1 by rotating and a second step of closing the manually operated valve 1 using the torque wrench 21 after the first step.
In the first step, if the manual round handle 4 is manually rotated or the open / close operation jig 16 includes the manual lever 23, the open / close operation jig 16 is engaged with the manual round handle 4. With the attached state, the manual lever 23 is artificially rotated, and the manually operated valve 1 is closed until a torque value lower than a predetermined fixed closing torque value is reached.
In the second step, after the completion of the first step, the fitting protrusion 22 of the torque wrench 21 is fitted into the fitting recess 20 of the opening / closing operation jig 16 engaged with and attached to the manual type round handle 4. To close the manual operation valve 1.
At that time, by setting a predetermined constant closing torque value for the torque wrench 21, the torque wrench 21 is idled when the closing torque value is reached. That is, the closing torque value set in the torque wrench 21 becomes the closing confirmation torque value, and the valves V1 to V5 provided in the pipes 28 and 32 to 34 are operated by performing the closing operation until the torque wrench 21 idles in the second step. Can be closed at a constant closing torque value as desired.

Next, various experiments were conducted to determine an appropriate closing torque value for a city gas valve used in a city gas plant.
The valves to be tested were the odorant valves V1 and V2 provided in the odorant flow pipe 28 of the city gas plant shown in FIG. 4, more specifically, the manually operated valve shown in FIG. The chart of FIG. 5 shows the experimental results.
In this experiment, in consideration of the actual fluid pressure acting on the odorant flow pipe 28, a 0.7 MPa fluid pressure and a 4.0 MPa fluid pressure were applied to the inlet-side flow path 8. Under the two fluid pressures, the closing torque value is increased stepwise by 5 N · m within a range of 5 to 40 N · m (kg · m / s ² ), and the leakage (valve leak) at that time The presence or absence was investigated.
The reason why the closing torque value is limited to a maximum of 40 N · m is that if a torque value exceeding that value is applied, the valve may be damaged with the passage of time. The closing torque value reached when closing by operation is generally about 20 to 25 N · m. Then, use a torque wrench to close the valve at the maximum closing torque value of 40 N · m, mark the position at that time as the reference position, and manually operate the round handle at each closing torque value of 5 to 35 N · m. Is shown. In FIG. 5, the position of 40 N · m is indicated by a thick line, and the counterclockwise direction is the opening direction.

From this experimental result, if the fluid pressure is 0.7 MPa, it can be sufficiently closed with a closing torque value of 5 N · m or more, but if the fluid pressure becomes 4.0 MPa, the closing torque value of 20 N · m or more. Without it, it can be understood that it cannot be reliably closed.
Therefore, the manually operated valve 1 for odorant provided in the odorant flow pipe 28 of the city gas plant can be reliably closed if the closing torque is at least 20 N · m. However, it is preferably set to 20 to 24 N · m in consideration of safety.
As described above, if the closing torque value exceeds 40 N · m, the valve may be damaged. Therefore, in actual implementation, the closing torque value is set to 20 to 24 N with respect to the torque wrench 21 to be used. A torque wrench having a maximum settable torque value of 40 N · m, which is a maximum torque value that can be set by the torque wrench 21 and can be actually pressurized, is used.

[Another embodiment]
(1) In the previous embodiment, the jig main body 17 of the opening / closing operation jig 16 is provided with a plurality of engaging protrusions 18 as engaging members, and the engaging protrusions 18 are connected to the connecting rod 3 of the manual type round handle 4. However, for example, a clamp member that can be directly engaged and fixed to the manual type round handle 4 itself is provided on the jig main body 17, and the clamp member can be used as the engagement member. .
Further, the manually operated valve 1 shown in FIG. 1 is merely an example, and the opening / closing operation jig 16 of the present invention can be of any kind as long as it has a valve rod 2 and a manually operated round handle 4 for opening and closing the valve. It can also be used for manually operated valves.

(2) In the previous embodiment, the example in which the valve closing method using the opening / closing operation jig 16 is applied to the valve provided in the piping of the city gas plant is shown. However, the present invention is not limited to the valve of the city gas plant. In the valve closing method of the present invention, for example, a valve provided in a pipe for toxic gas passage, such as a valve provided in a pipe of any kind, as long as the valve rod 2 for opening and closing the valve and the manual round handle 4 are provided. It is also applicable to.

DESCRIPTION OF SYMBOLS 1 Manual operation type valve 2 Valve rod 4 Manual type round handle 16 Opening and closing operation jig 17 Jig body 18 Engagement protrusion as an engagement member 20 Rotation operation part 21 Torque wrench 23 Manual lever 28 for rotation operation 28 of city gas plant Pipe for odorant flow as piping L Rotating shaft center of valve stem V1, V2 Valve for odorant as city gas valve

Claims (7)

An opening / closing operation jig for a manually operated valve having a valve rod that opens and closes a valve by a rotation operation, and a manually operated round handle for rotation operation attached to the valve rod,
A jig body having an engagement member that can be rotated by engaging with the manual type round handle, and the jig body rotates the valve stem in an engaged state with the manual type round handle; An open / close operation jig for a manually operated valve having a rotation operation part for mounting a torque wrench located on an axis.   The engaging member is a plurality of engaging protrusions that extend to the inside of the manual type round handle and engage, and the rotation operation portion is provided on the opposite side of the engaging protrusion with the jig body interposed therebetween. The opening / closing operation jig for a manually operated valve according to claim 1.   3. The manual operation according to claim 1, wherein the jig body includes a manual lever for rotating operation that extends outward from an outer periphery of the manual round handle in a state of engagement with the manual round handle. Open / close operation jig for operation type valves. A valve closing method for closing a manually operated valve using the opening / closing operation jig according to any one of claims 1 to 3,
A first step of manually rotating the manually operated round handle to close the manually operated valve;
After completion of the first step, a torque wrench is fitted to the rotation operation portion of the opening / closing operation jig engaged with and attached to the manual type round handle, and the torque wrench is set in advance as a torque value for closing confirmation. A second step of closing the manually operated valve until a closing torque value of
Including valve closing method.   The valve closing method according to claim 4, wherein the manually operated valve is a city gas valve provided in a fluid flow pipe of a city gas plant.   6. The valve closing method according to claim 5, wherein the city gas valve is an odorant valve provided in a pipe for odorant passage.   The valve closing method according to claim 6, wherein the constant closing torque value is 20 to 24 N · m, and the maximum settable torque value of the torque wrench is 40 N · m.

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