JPH03194271A - Method and device for repairing gas cock - Google Patents

Abstract

PURPOSE:To make maintenance of a closing piece possible even when a gas cock is in use by deforming an elastic member by the closing piece by means of a closing piece insertion/removal tool, additionally provided in a work case, and receiving the closing piece into generated space and also decreasing a gas amount to a fine amount into the work case by the elastic member. CONSTITUTION:A work case D, in which an elastic member 13 is built, is mounted to a cock main unit 4 through a shutoff tool C. After the shutoff tool C is opened, the elastic member 13 is deformed by a closing piece 20 with a closing piece insertion/removal tool E, additionally provided in the work case D, and the shutoff tool C is closed in a condition that inflow transport gas from the cock main unit 4 to the work case D is decreased to a fine amount by action of the elastic member 13, by taking out the closing piece 20 from the cock main unit 4 to be housed in space generated by deformation. Next the work case D is removed from the cock main unit 4, and cleaning and lubricant-applying work for the closing piece 20 is executed outside the work case D. In this way, the lubricant-applying work to the closing piece in a gas cock, in use, can be easily executed in such a condition as gas leakage is suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a gas cock installed in a fuel gas pipe for city gas, for example, in which a new lubricant such as grease is applied to the circumferential surface of the closure. , relating to technology for suppressing gas leaks.

More specifically, a closed working case is airtightly attached to the cock body provided in the fuel gas piping, and a closure insertion/removal tool, which is passed through the working case in an airtight manner, is connected to the closure. , pulling out the closure insertion/removal tool by an operation from the outside of the work case, extracting the closure into the inside of the work case, cleaning the circumferential surface of the closure, and applying lubricant to the circumference. and fitting the closure in the work case, which is airtightly attached to the cock body, into the cock body by pushing the closure insertion/removal tool from outside the work case; While removing the work case from the cock body,
The present invention relates to a gas cock repair method for removing the closure insertion/removal tool from the closure, and a repair device used therein.

[Conventional technology]

Conventionally, as shown in Japanese Utility Model Application No. 64-3179,
Connect the work case to the cock body, pull out the closure into the work case with air still in the work case, and clean the work case attached to the work case with the closure still housed inside the work case. Cleaning and lubricant application to the closure was performed by operating the tool or lubricant applicator from the outside, and by operating the closure insertion/removal tool from the outside.

Furthermore, after fitting the closure coated with new lubricant to the cock body, the work case housing the transport gas was removed from the cock body without changing.

[Problem to be solved by the invention]

However, cleaning and applying lubricant to the closure inside the work case is difficult, especially for larger gas cocks, and there is room for improvement in workability.

There is also a problem in that the air in the work case flows into the fuel gas pipe, causing problems such as gas leakage accidents due to unexpected extinguishing of the burner and adverse effects on products in industrial furnaces.

In addition, when the work case is removed, the gas inside the case is released into the atmosphere, and the worker smells it and feels it is a gas leak, making it difficult to check for gas leakage. There were problems such as the shutoff valve linked to the leak alarm operating unexpectedly, and there was room for improvement in the - layer.

An object of the present invention is to easily apply new lubricant to the gas cock closure, even if the gas cock is large, and to do so while sufficiently suppressing the release of transport gas into the atmosphere. This makes it possible to prevent increased work burden and unnecessary gas supply cutoffs due to misidentification of gas leaks, and also to allow work to be carried out while sufficiently suppressing air inflow into the fuel gas piping. ,
The purpose of this invention is to prevent gas leakage accidents caused by unexpected extinguishing of burners and adverse effects on products in industrial furnaces.

[Means for Solving the Problems] The characteristic means of the first invention is that an elastic body is provided inside the working case, and between the working case and the cock body, the both are in a communicating state and in a non-communicating state. A blocking device for switching to a communication state is interposed, and when the closure is removed into the work case, the elastic body is deformed by the closure, and the space created by the deformation of the elastic body is filled with the After that, the shutoff device is closed, the work case is removed from the work case, the work case is taken out from the work case, and the work case is cleaned and lubricated. The method is performed outside the case, and prior to fitting the closure into the cock body, the closure is inserted into the space created by the deformation of the elastic body while the closure is attached to the closure insertion/removal tool. The working case is airtightly connected to the shut-off device in a closed state, and the shut-off device is opened and operated as follows.

[For production]

Since the elastic body is provided inside the work case, the volume of the portion of the internal space of the work case that communicates with the cock body can be made extremely small by the action of the elastic body, and in this way the volume flows into the cock body. Attach a work case with an extremely small amount of air to the cock body via a shutoff device, open the shutoff device, and use the closure insertion/removal tool attached to the work case.
The elastic body is deformed by the closure, and the closure is accommodated in the space created by the deformation, and the closure is moved from the cock body into the work case, and the elastic body moves from the cock body to the work case. The shutoff device is closed while the amount of transport gas flowing in is minimized, the working case is removed from the cock body, and the closing member is cleaned and lubricated outside the working case.

Therefore, unlike the prior art mentioned above, cleaning and lubricant application to the closure is performed by externally operating a cleaning tool, a lubricant applicator, and a closure insertion/removal tool inside the work case. The work can be carried out easily and quickly, and is particularly effective in improving the workability of large gas cocks.

Furthermore, when the closure is removed, the action of the elastic body can sufficiently suppress air inflow from the working case into the fuel gas pipe and transport gas inflow from the fuel gas pipe into the working case.

Then, by housing the repaired closure in the space created by the displacement of the elastic body, the work case containing the closure is placed in a state where the amount of air flowing into the cock body is minimized.
Attach to the cock body via the shutoff device, open the shutoff device, fit the shutoff to the cock body using the shutoff insertion/removal tool, and at the same time expand the elastic body to separate the internal space of the work case from the cock body. The volume of the part to be inserted is kept small, and then the work case and interrupter are recovered.

Therefore, even when installing the closure, the inflow of air from the inside of the work case into the fuel gas pipe and the inflow of gas transported from the fuel gas pipe into the work case can be sufficiently suppressed by the action of the elastic body. .

In short, it is possible to sufficiently suppress air inflow into the fuel gas piping due to gas cock repair, and prevent problems caused by unexpected extinguishing of burners due to air inflow, such as gas leak accidents and adverse effects on products in industrial furnaces. can be prevented, and
The flow of transport gas into the work case can be sufficiently suppressed, and when the work case is removed, the transport gas dissipates from inside the case, causing the operator to misidentify a gas leak, or preventing gas supply from being detected by a gas leak detector. We can reliably solve problems such as automatic shutoffs occurring unexpectedly, and repair gas cocks without gas leaks in a highly efficient manner without wasting any work.
It can be successfully implemented without causing inconvenience to customers due to unexpected gas shutoffs.

[Means to solve the problem]

The characteristic means according to the second aspect of the present invention is that a membrane-like body capable of freely adjusting the back pressure is provided inside the working case, and between the working case and the cock body, the two are in a communicating state and a non-communicating state. A blocking device is installed to change the state, and when the closure is removed into the work case, the closure deforms the membrane and fills the space created by the deformation of the membrane. Accommodating the obturator and increasing the back pressure of the membranous body to force a part of the membranous body into the passage formed in the obturator, then closing the shutoff device and performing the operation. removing the stopper from the shutoff device, taking out the closer from the work case, cleaning and applying lubricant to the closer outside the work case, and prior to fitting the closer to the cock body. Then, with the obturator attached to the obturator insertion/removal tool and the obturator accommodated in the space created by the deformation of the membranous body, a part of the membranous body is further removed. The work case containing the closure is connected to the shutoff device in a state where the closure is forced into the passageway by back pressure, and the shutoff device is opened and operated; Its action is as follows.

[For production]

Since the membrane-like body is provided inside the work case, the volume of the part of the internal space of the work case that communicates with the cock body can be made extremely small, and in this way, the volume of the part of the interior space of the work case that communicates with the cock body can be made extremely small. Attach a work case with an extremely small amount of air flowing into the cock body via a shutoff device, open the shutoff device, and use the closure insertion/removal tool attached to the work case.
The membranous body is deformed by the obturator, and the obturator is accommodated in the space created by the deformation, and the obturator is moved from the cock body into the work case, and the membranous body is deformed by increasing the back pressure against the membranous body. A part of the gas is allowed to enter the passageway of the closing valve, the amount of transport gas flowing from the cock body into the work case is minimized by the action of the membrane, and the shutoff device is closed, and the work case is removed from the cock body. , cleaning and lubricating the closures are performed outside the work case.

Therefore, like the first invention, cleaning and lubricant application work can be easily and quickly carried out, which is particularly effective in improving workability in large gas cocks. Air inflow from the fuel gas pipe into the fuel gas pipe,
Furthermore, the flow of transport gas from the fuel gas pipe into the work case can be sufficiently suppressed by the action of the membrane.

Then, the repaired closure was accommodated in the space created by the displacement of the membrane-like body, and a part of the membrane was inserted into the passage of the closure, thereby minimizing the amount of air flowing into the cock body. In this state, attach the work case containing the closure to the cock body via the shutoff tool, open the shutoff, fit the closure to the cock body using the closure insertion/removal tool, and at the same time remove the membrane body from the back. By restoring and deforming with pressure, the volume of the portion of the internal space of the work case that passes through the cock body is kept small, and then the work case and the shutoff device are recovered.

Therefore, even when installing the closure, the action of the membrane can sufficiently suppress the inflow of air from inside the work case into the fuel gas pipe and the inflow of gas from the fuel gas pipe into the work case. .

In short, similar to the first invention, it is possible to sufficiently suppress the inflow of air into the fuel gas piping due to the repair of the gas cock, prevent troubles caused by unexpected extinguishing of the burner due to the inflow of air, and furthermore, the work The inflow of transport gas into the work case can be sufficiently suppressed, and troubles caused by transport gas dissipating from inside the work case when the work case is removed can be reliably prevented.

〔Effect of the invention〕

As a result, it is not only possible to apply lubricant to the closing member of the gas cock in use while sufficiently suppressing gas leakage, but it is also possible to apply lubricant to the closure of the gas cock in use, which is advantageous in terms of workability even with large gas cocks, and allows air to flow in. We were able to establish an extremely superior gas cock repair method that can be carried out in good condition on the gas supply side without causing any trouble.

Moreover, as described in claims 2 and 3, it is now possible to provide a gas cock repair device that is convenient for carrying out the excellent gas cock repair method of the present invention.

[Example A]

Embodiments of the first invention are shown in FIGS. 1 to 4. FIG.

First, the repair device will be explained.

The repair device is a gas cock (
It consists of a shutoff device (C) to be attached to E), a work case (D) that is detachable from the shutoff device (C), and a closure insertion/removal tool (E) attached to the work case (D). .

In the interrupter (C), tighten the pair of hooks (la) and (lb) that are to be secured to the pipe (A), and tighten the fixing bolt (2a).
), (2b) is connected to the main body (3), and an adjusting ring (5) is attached that is fitted inside the main body (3) and externally fitted to the cock main body (4), and the main body (3) and the adjusting ring ( a seal ring (6) that airtightly seals between the adjustment ring (5) and the cock body (4);
(7) and hooks (la) and (lb) to the piping (A).
) and tightening (2a) and (2b), the closing opening of the main body (3) is communicated with the closing opening of the cock body (4). Then, the main body (
3) can be airtightly connected to the cock body (4). Further, a slide shutter (8) for opening and closing the closing member entrance/exit opening is provided on the main body (3) so as to be openable/closeable by an operating portion (9).

Attach the work case (D) to a pair of bolts (10a), (1
A seal ring (11) is attached to the shutoff device (C) using the seal ring (11) that airtightly seals between the work case (D) and the shutoff device (C) using an elastic body (13) such as sponge or rubber. are provided throughout the interior of the work case (D).

To form the closure insertion/removal tool (E), a shaft (
18), a connecting part (21) connected to the operating shaft of the closure (20) by a screw (19) is provided at the inner end of the shaft (18), and a nut (25) with a handle (24) is attached to the shaft ( 18), and attach the screws to the outer end of the work case (D).
A washer shaft 6) is provided between the nut (25) and the nut (25). In other words, when the shaft (18) is pulled out of the work case (D) by rotating the nut (25), the closure (20) connected to the shaft (18) is moved from the cock body (4) to the work case (D). ) is configured so that it can be extracted within. In addition, a seal ring (2) airtightly seals the gap between the bush (27) attached to the work case (D) and the shaft (18).
8) is provided.

Next, a method for repairing the gas cock (E) will be explained.

(1) Remove the gland for preventing the closure from falling out from the cock body (4), and if necessary, clean the end surface of the cock body (4) that contacts the seal ring (6) with a wire brush or the like.

(2) As shown in Fig. 4, connect the connecting part (21) of the shaft (18) removed from the work case (D) to the
) to the operating shaft of the cock body (4), and with the slide shutter (8) open, connect the shutoff device (C) to the cock body (4).
) to hook (la), (lb) and bolt (2a),
Fix it airtight with (2b).

(3) As shown in Fig. 1, with the shaft (18) passing through the work case (D), attach the work case (D) to the interrupter (C) with the bolt (10a). (1
0b) to connect airtightly. At this time, the expanded elastic body (
13) makes the amount of air inside the work case (D) very small, and when the slide shutter (8) is opened later, the air inflow into the fuel gas pipe (A) is sufficiently suppressed.

(4) Attach the washer (26) and nut (
25) and operate the handle (24) to remove the shirt) (
1, 8) and pull out the closure (20) into the work case (D) as shown in FIG.

At this time, the elastic body (13) is deformed by the closure (20), and the closure (20) is inserted into the space created by the deformation of the elastic body (13).
20), the amount of transport gas flowing into the working case (D) is minimized by the action of the elastic body (I3), and when the working case (D) is then removed, the transport gas is sufficiently dissipated to the outside. suppress.

(5) Fully open the slide shutter (8), remove the work case (D) from the blocker (C), and tighten the nut (2).
5) and washer (26), take out the closure (20) from the work case (D), clean the circumferential surface of the closure (20), and apply lubricant such as grease, oil, or sealant. Execute outside the work case (D).

(6) Again, as shown in Fig. 2, with the closure (20) attached to the closure insertion/removal tool (E), and the elastic body (13)
The work case (D) is airtightly connected to the interrupter (C) with the closure (20) housed in the space created by the deformation of the work case (D). Note that the neck 1-(25) and washer (26) may remain removed.

At this time, the elastic body (13) acts to reduce the amount of air in the work case (D) to a very small amount, and the next time the slide shutter (8) is opened, air inflow into the fuel gas pipe (A) is sufficiently suppressed.

(7) With the slide shutter (8) fully open and the shutter (20) adjusted to the opening position by rotating the shaft (18) as shown in Figure 1, the shutter can be closed by pushing in the shaft (18). (20) is fitted onto the cock body (4).

At this time, the elastic body (13) is restored and expanded, and the elastic body (13) is restored and expanded.
By the action of 3), the amount of 1 2 transport gas flowing into the working case (D) is minimized, and then the working case (D)
Sufficiently suppresses external dissipation of transport gas when removed.

(8) Remove the work case (D) from the interrupter (C) and pull it out from the shaft (18).

(9) Collect the shutoff (C) and shaft (18), and attach the gland packing and gland to the cock body (4).

[Example B]

An embodiment of the second invention is shown in FIGS. 5 to 7.

First, the repair device will be described, but the same reference numerals as those in the above-mentioned embodiment A will be given the same reference numerals and the explanation will be omitted.

Instead of the aforementioned elastic body (13), an elastically stretchable membrane body (14) formed into a hollow body shape is provided throughout the interior of the work case (D), and back pressure is applied to the membrane body (14). A tube (5) for supplying and discharging pressurized fluid to be applied is passed through the work case (D) to supply and discharge pressurized fluid to freely adjust the back pressure of the membrane body (14). Insert the container (I6) into the tube (
15).

Next, we will explain how to repair the gas cock (E).

(b) (1), (2), (3) in the aforementioned Example A
) is carried out in the same manner. However, in the step (3) above, the air inside the work case (D) is reduced to a minute amount by the membrane (14) as shown in FIG.

(b) Step (4) in Example A is carried out in the same manner. However, as shown in FIG. 6, the membranous body (14) is deformed by the obturator (20), the obturator (20) is housed in the space created by the deformation of the membranous body (14), and the membrane is The amount of transport gas flowing into the working case (D) is minimized by the action of the shaped body (14).

(c) By increasing the back pressure of the membrane body (14) with the pressurized fluid supply/discharge device (16), as shown in FIG.
A part (4a) of the membrane-like body (14) is inserted into the passage (22) formed in the
) is introduced by its elastic elongation, and the transport gas in the passage (22) is expelled to the outside of the working case (D), thereby sufficiently reducing the amount of transport gas in the working case (D).

(d) Perform step (5) in Example A in the same manner. However, before taking out the closure (20) from the work case (D), the back pressure of the membrane (14) is reduced.

(e) Step (6) in Example A is carried out in the same manner. However, the space created by the deformation of the membranous body (14) accommodates the closure (20), and the part (1, 4a) of the membranous body (14)
) is forced into the passageway (22) of the closure (20) by increasing back pressure.

(f) Step (7) in Example A is carried out in the same manner. However, before pushing the shaft (18), the membrane (14)
reducing the back pressure of the closure (20) to facilitate fitting of the closure (20);
In addition, the membrane-like body (14) is restored and deformed, and the membrane-like body (14)
) to minimize the amount of transport gas flowing into the work case (D).

(g) Steps (8) and (9) in Example A are carried out in the same manner.

[Another example]

Next, another embodiment will be described.

The specific means for attaching the shutoff device (C) to the cock body (4) can be changed as appropriate. For example, the shutoff device (C) can be locked to the cock body (4) by locking a hook to the cock body (4), or by using the sealing hook provided on the cock body (4). It may be possible to fix it.

The specific structure of the shutoff device (C) and the connection structure to the cock body (4) can be appropriately selected. For example, instead of the slide shutter (8), a rotary valve body may be provided that can be operated externally.

The specific structure of the work case (D) and the connection structure to the interrupter (C) can be appropriately selected.

The specific structure of the closure insertion/removal tool (E) can be changed appropriately, for example, it may be provided with a drive means for connecting and disconnecting from the closure (20) or for inserting/removing the closure (20). good.

The type of gas transported by the fuel gas pipe (A) does not matter, and the model of the gas cock (E) to be repaired also does not matter. The installation can be carried out with the insertion hole of the child removal prevention bolt closed with a cap.

The elastic body (13) in the first invention can be appropriately modified in terms of material, structure, shape, installation state, etc. For example, the following changes (a) to c) can be made.

(a) A notch is provided in the elastic body (13) to facilitate the crowding of the closure (20). In this case, a cut may be formed so that a part of the elastic body (13) enters the passageway (22) of the closure (20).

(b) Gas is sealed in a hollow body made of a flexible material to form an elastic body (13).

(c) An elastic body (13) is partially arranged inside the work case (D) on the side connected to the interrupter (C), and the elastic body (13) is
The space deeper than 13) is hermetically sealed off with an elastic body (13). In this case, the elastic body ( ) 3 may be in the form of a stretchable plate.

The membrane-like body (14) in the second invention can be appropriately changed in its material, structure, shape, installation state, etc. For example, the following (
Modifications to sections a) and (b) are possible.

(a,) A membrane-like body (14) made of a flexible material is wrapped around the obturator (20) and the passageway (22) of the obturator (20).
Shape it into a shape that will fit inside.

(b) Membrane-like body (14
), or an elastically stretchable plate-like membrane body (14) is transversely arranged inside the work case (D) on the side connected to the shutoff device (C), so that the work case is completely covered over the entire circumference. (D
), and is configured to supply and discharge fluid for back pressure to an airtight space deeper than the membrane body (14).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 4 show embodiments of the first invention, and
2 is a sectional view of the repair device, FIG. 2 is a view taken along the line ■-■ in FIG. 1, FIG. 3 is a view taken along the line ■-■ in FIG. 2, and FIG. 4 is an explanatory view of the construction state. FIGS. 5 to 7 show embodiments of the second invention, and FIG.
6 is a sectional view of the repair device, FIG. 6 is a view taken along the VI-VI arrow in FIG. 5, and FIG. 7 is a view taken along the ■-■ arrow in FIG. 6. (A)... Piping, (C)... Shutoff device,
(D)...Case for work 7 to 8, (E)...Closer insertion/removal tool, (4)...
...cock body, (13) ... elastic body, (
14)... membranous body, (14a)... part of membranous body, (20)... membranous body, (22)...
...A closed passageway.

Claims (1)

[Claims] 1. Attaching a closed work case (D) to the cock body (4) provided in the fuel gas pipe (A) in an airtight manner,
A closure insertion/removal tool (E) passed through the work case (D) in an airtight manner is connected to the closure (20), and the closure is operated from outside the work case (D). Pull out the insertion/removal tool (E), pull out the closure (20) into the inside of the work case (D), and after cleaning the circumferential surface of the closure (20), apply lubricant to the circumference. Then, the closing member (20) inside the work case (D), which is airtightly attached to the cock body (4), is inserted into the closing member insertion/removal tool (
The working case (D) of E) is fitted into the cock main body (4) by a pushing operation from the outside, and the working case (D) is removed from the cock main body (4), and the closing member is inserted and removed. Close the tool (E) with the closure (20)
A method for repairing a gas cock that is removed from a gas cock, comprising: providing an elastic body (13) inside the working case (D), and installing the elastic body between the working case (D) and the cock body (4) A blocking device (C) is interposed to switch the two into a communicating state and a non-communicating state, and when the closing member (20) is extracted into the work case (D), the closing member (20) closes the The elastic body (13) is deformed and the closure (20) is accommodated in the space created by the deformation of the elastic body (13), after which the shutoff device (C) is closed and the work case ( D) the above-mentioned interrupter (
C), take out the closure (20) from the work case (D), clean and apply lubricant to the closure (20) outside the work case (D), and remove the cock body. Prior to fitting the closure (20) into the closure (4), the closure (20) is attached to the closure insertion/removal tool (E) and the elastic body (13) is deformed. a gas cock that airtightly connects the work case (D) to the shutoff device (C) in a closed state with the shutoff device (20) housed in a closed space, and opens the shutoff device (C); repair method. 2. Attach the closed work case (D) to the cock body (4) provided on the fuel gas pipe (A) in an airtight manner,
A closure insertion/removal tool (E) passed through the work case (D) in an airtight manner is connected to the closure (20), and the closure is operated from outside the work case (D). Pull out the insertion/removal tool (E), pull out the closure (20) into the inside of the work case (D), and after cleaning the circumferential surface of the closure (20), apply lubricant to the circumference. Then, the closing member (20) inside the work case (D), which is airtightly attached to the cock body (4), is inserted into the closing member insertion/removal tool (
The working case (D) of E) is fitted into the cock main body (4) by a pushing operation from the outside, and the working case (D) is removed from the cock main body (4), and the closing member is inserted and removed. Close the tool (E) with the closure (20)
A method for repairing a gas cock removed from the work case (D), wherein a membrane-like body (14) that can freely adjust the back pressure is provided inside the work case (D), and the work case (D)
and the cock body (4), a blocking device (C) is interposed between the two to switch between a communicating state and a non-communicating state, and the closing member (20) is inserted into the work case (D). When extracting the membrane, the membrane body (14) is deformed by the membrane body (20), and the membrane body (20) is accommodated in the space created by the deformation of the membrane body (14). The passage formed in the closure (20) by increasing the back pressure of the body (14)
22), insert a part (14a) of the membrane-like body (14) into the block, then close the blocker (C), remove the work case (D) from the blocker (C), and Closed child (20
) from the work case (D), and remove the closure (2) from the work case (D).
Cleaning and applying lubricant to 0) in the work case (
D) Execute outside and close the cock body (4) (20
) Prior to fitting, the closure (
20) is attached, and with the closure (20) accommodated in the space created by the deformation of the membrane (14), a part (14a) of the membrane (14) is further attached. ) is forced into the passageway (22) of the closure (20) with back pressure, and the work case (D) containing the closure (20) is hermetically sealed to the shutoff (C). A method of repairing a gas cock by connecting the valve and opening the shutoff device (C). 3. It has a shutoff device (C) that is detachable from the cock body (4) of the fuel gas pipe (A), and a sealed work case (D) that is detachable from the shutoff device (C). , a closure insertion/removal tool (E) for attaching and detaching the closure (20) to the cock body (4) through the isolation device (C);
An elastic body (13) is provided inside the work case (D) to penetrate the work case (D) in an airtight manner and accommodate the closure (20) in the space created by the deformation. Gas cock repair equipment. It has a shutoff tool (C) that is detachable from the cock body (4) of the fuel gas pipe (A), and a sealed work case (D) that is detachable from the shutoff tool (C), A closure insertion/removal tool (E) for attaching and detaching the closure (20) to the cock body (4) through the isolation device (C);
A membranous body (14) with adjustable back pressure is inserted into the work case (D) in an airtight manner and accommodates the closure (20) in the space created by the deformation. , and a part (14a) of the membrane-like body (14) closes the passageway (20) of the closure (20) due to increased back pressure.
22) Gas cock repair device designed to allow entry