JP2010019328A - Opening and closing valve removing means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening and closing valve removing means capable of removing an opening and closing valve in a constant flowing state by easily installing a suppressor in a predetermined portion of an existing fluid pipe and suppressing circulation of fluid. <P>SOLUTION: The opening and closing valve removing means is composed of the suppressor 10 equipped with an annular sealing member 14 and suppressing circulation of fluid in the predetermined portion of the existing fluid pipe 2, and an installation device 11 connected to the opening and closing valve 5 in a communicated state with the existing fluid pipe 2 and installing the suppressor 10 in the predetermined portion. An engagement reception part 3b projecting into a pipe interior is provided in the predetermined portion, the suppressor 10 is equipped with an engaging part engaging with the engagement reception part 3b, and the installation device 11 is comprised to move the suppressor 10 toward the predetermined portion from a housing part 22 via the opening and closing valve 5, and to engage the engaging part of the suppressor 10 with the engagement reception part 3b in the predetermined portion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an on-off valve removing means for removing an on-off valve connected in communication with an existing fluid pipe in an uninterrupted state.

  Conventionally, at a predetermined location of an existing fluid pipe, an annular sealing member that seals between the inner peripheral surface of the existing fluid pipe is provided, and a deterrent body that suppresses the flow of fluid is installed, and an on-off valve is removed in an uninterrupted state. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 8-14440 (page 4, FIG. 2)

  However, in Patent Document 1, after the restraining body is pushed to the installation position inside the recessed groove formed along the inner peripheral surface of the existing fluid pipe, the engaging portion provided in the restraining body is recessed. Since it is the structure inserted in a groove | channel, the precision was requested | required for the arrangement | positioning in the installation position of a suppression body, and there existed a possibility that installation of a suppression body might become difficult.

  The present invention has been made paying attention to such problems, and by removing the on-off valve in an uninterrupted flow state by easily installing a deterrent body at a predetermined location of an existing fluid pipe to inhibit the flow of fluid. It is an object of the present invention to provide an on-off valve removing means that can do this.

In order to solve the above problem, the on-off valve removing means according to claim 1 of the present invention comprises:
An on-off valve removing means for removing the on-off valve connected to the existing fluid pipe in an uninterrupted state,
Provided with an annular sealing member that seals between the inner peripheral surface of the existing fluid pipe at a predetermined location of the existing fluid pipe, and a restraining body that restrains the flow of fluid, and a storage portion that houses the restraining body in a sealed manner. An installation device that is connected to the on-off valve so as to be able to communicate with an existing fluid pipe, and that installs the suppression body at the predetermined location;
The predetermined portion is provided with an engaged portion that protrudes toward the inside of the tube, and the suppression body includes an engaging portion that engages with the engaged portion,
The installation device moves the restraining body from the housing portion toward the predetermined location via the opening / closing valve, and engages the engaging portion of the restraining body with the engaged portion at the predetermined location. It is characterized by that.
According to this feature, the restraining body is directed from the housing portion to the predetermined position via the on-off valve by the installation device that includes the housing portion that accommodates the restraining body in a sealed manner and is connected to the on-off valve so as to communicate with the existing fluid pipe. By moving and engaging the engaging portion of the deterrence body with the engaged portion at a predetermined location, and easily installing the deterrence body at the predetermined location of the existing fluid pipe to suppress the flow of the fluid, an uninterrupted flow state The on-off valve can be removed.

The on-off valve removing means according to claim 2 of the present invention is the on-off valve removing means according to claim 1,
A communication passage is formed in the deterrence body so as to communicate between the predetermined portion side and the housing portion side so as to be openable and closable.
According to this feature, a communication passage is formed in the deterrence body so as to open and close the predetermined portion side and the accommodating portion side, and the communication passage is opened when the deterrence member moves toward the predetermined portion. Since the fluid also circulates to the accommodating portion side through the communication passage, the pressure difference due to the fluid before and after the deterring body is eliminated, and the deterring body is easily moved.

The on-off valve removing means according to claim 3 of the present invention is the on-off valve removing means according to claim 2,
The installation apparatus includes an opening valve that can open the housing portion.
According to this feature, when the deterrent body is moved toward a predetermined location, by opening the release valve, the air in the housing portion and the fluid flowing into the housing portion can be easily replaced, and the fluid is contained in the housing portion. Since it is easy to distribute to the side, the differential pressure before and after the deterrent body can be eliminated immediately.

The on-off valve removing means according to claim 4 of the present invention is the on-off valve removing means according to any one of claims 1 to 3,
The installation device is a sealed state of the sealing member that seals between an unsealed state of the sealing member that can move the deterrence member toward the predetermined location and an inner peripheral surface of an existing fluid pipe at the predetermined location. In addition, it is characterized by being switchable.
According to this feature, the sealing device seals between the non-sealed state of the sealing member that can move the deterrent body toward the predetermined location and the inner peripheral surface of the existing fluid pipe at the predetermined location by the installation device. In addition, since it is possible to switch, the sealing member can be placed in a predetermined position without being damaged as the non-sealed state when the restraining body is moved toward the predetermined position.

The on-off valve removing method according to claim 5 of the present invention is:
An on-off valve removal method for removing an on-off valve connected to an existing fluid pipe in an uninterrupted state,
Provided with an annular sealing member that seals between the inner peripheral surface of the existing fluid pipe at a predetermined location of the existing fluid pipe, and a restraining body that restrains the flow of fluid, and a storage portion that houses the restraining body in a sealed manner. With an installation device that installs the deterrent body at the predetermined location,
The predetermined portion is provided with an engaged portion that protrudes toward the inside of the tube, and the suppression body includes an engaging portion that engages with the engaged portion,
The installation device is a sealed state of the sealing member that seals between an unsealed state of the sealing member that can move the deterrence member toward the predetermined location and an inner peripheral surface of an existing fluid pipe at the predetermined location. And it is possible to switch,
An attachment step of closing the on-off valve and connecting the installation device to the on-off valve so as to communicate with an existing fluid pipe;
After the mounting step, the opening and closing valve is in an open state and the sealing member is in the non-sealed state, the moving body moving from the housing portion to the predetermined location via the opening and closing valve,
After the moving step, an engaging step of engaging the engaging portion of the deterrent body with the engaged portion at the predetermined location;
After the engagement step, the depressing step of keeping the sealing member in the sealed state and suppressing the flow of fluid;
It is characterized by comprising a removal step of removing the on-off valve while removing the installation device after the inhibiting step.
According to this feature, a deterrent that seals the sealing member in the moving process by an installation device that includes a housing portion that accommodates the deterrent body in a sealed manner and is connected to the on-off valve so as to be able to communicate with an existing fluid pipe in the mounting process. The body is moved from the housing portion toward a predetermined location via the on-off valve, and the engaging portion of the deterrent body is engaged with the engaged portion at the predetermined location in the engaging step, and the sealing member is brought into a sealed state in the depressing step. By sealing the flow of fluid and suppressing the flow of fluid by a deterrent body at a predetermined location of the existing fluid pipe, the on-off valve can be easily removed in a continuous flow state in the removal step. In particular, under the stable condition in which the restraining body is engaged with the engaging portion in the engaging step, the fluid flow can be sealed by setting the sealing member in the sealed state in the restraining step without being affected by the pressure of the fluid.

  Examples of the present invention will be described below.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a schematic view showing an attaching process of an on-off valve removing means in the embodiment of the present invention. FIG. 2 is a schematic view showing the moving process. FIG. 3 is an enlarged cross-sectional view showing a communication path through which fluid flows before and after the deterrent body. Fig.4 (a) is a side view of an engagement top, (b) is AA sectional drawing of (a). FIG. 5 is a schematic view showing the engaging step. FIG. 6 is an enlarged cross-sectional view showing the inhibiting step. Fig.7 (a) is sectional drawing which showed the condition which removes a plug cover in a part of removal process, (b) is BB sectional drawing of (a). FIG. 8 is a cross-sectional view showing a situation where a bolt is screwed.

  As shown in FIG. 1, a main pipe 1 through which a fluid flows and a branch pipe 2 that branches substantially perpendicularly to the main pipe 1 constitute an existing fluid pipe. Is in circulation. The flange 2a formed at the end of the branch pipe 2 is connected to a flange 5c on one end side of the on-off valve 5 mainly used for drainage in a watertight manner, and the valve body 5b in the valve housing 5a is in a closed state. The flow of the fluid in the pipe is blocked. A special member is not connected to the flange 5d on the other end side of the on-off valve 5 at the normal time shown in the figure, and a drainage hose or the like (not shown) can be connected at the time of drainage. In addition, the fluid which distribute | circulates the existing fluid pipe | tube is not necessarily restricted to tap water, You may be another kind of liquid or gas.

  Perforations 2a and 2a penetrating the upper and lower tube walls are formed at predetermined locations in the center of the branch pipe 2 in the figure, and sleeves 3a and 3a communicating with the perforations 2a and 2a are provided. The engaged bolt 3b as the engaged portion is screwed into the female screw portion of the sleeve 3a in a watertight manner with the tip 3c protruding into the branch pipe 2. Note that the above-described engaged portions are not limited to being provided above and below the branch pipe, and may be provided on the left and right at a substantially central height position of the branch pipe, for example. In this way, it is possible to avoid the possibility that impurities in the branch pipe are mixed. Furthermore, the engaged parts are not limited to the two places described above, and may be provided at predetermined places according to the number of engaging parts described later.

  Next, the on-off valve removing means will be described. The on-off valve removing means installs the deterrence body 10 that inhibits the flow of fluid at the predetermined position of the branch pipe 2 and the deterrence body 10 at the predetermined position as will be described later. The installation apparatus 20 is mainly configured. The restraining body 10 includes an operation handle 27 via an insertion shaft 24, a non-interlocking joint 25, and a feed shaft 26, one end of which is watertightly inserted into a plug cover 23 and a housing portion 22 that houses the right side of the restraining body 10 in the figure. It is connected to the. Each member connected to the restraining body 10 constitutes an installation device 20. The feed shaft 26 is fitted into a support plate 29 supported by two support shafts 28, 28 erected on the flange 21 integral with the accommodating portion 22.

  3 and FIGS. 4A and 4B, the restraining body 10 will be described in detail. The restraining body 10 includes an O-ring 14 that is an annular elastic body as a sealing member along the outer peripheral surface. It comprises an engaging top 11, a nut 12, and a bolt 15 into which the engaging top 11 and the nut 12 are screwed. Further, the engaging top 11 includes an overhanging portion 11a projecting in the outer diameter direction in the circumferential direction, and an engaging portion bulging in the outer diameter direction in a substantially J shape so that one side is slightly opened in a side view. 11b. In addition, the bolt 15 has a communication passage R that communicates an opening 15a formed on the front end surface of the lower neck portion and an opening 15b formed on the rear peripheral surface. The nut 15c is fixed by welding or the like in a screwed state.

  As shown in FIG. 3, the connection of the restraining body 10 will be described in detail. The plug cover 23 connected to the insertion shaft 24 is screwed to the nut 12 constituting the restraining body 10. A plurality of through holes 23 a are formed on the peripheral surface of the plug cover 23 and communicate with the communication path R of the bolt 15 described above.

  Next, removal of the on-off valve by the on-off valve removing means will be described in the order of steps.

  As shown in FIG. 1, the attachment process will be described. The flange 21 constituting the installation device 20 is connected to the flange 5 d on the other end side of the on-off valve 5 in a watertight manner. By doing in this way, the suppression body 10 will be watertightly accommodated inside the illustration right side in the housing | casing part 22 and the valve housing | casing 5a connected to the accommodating part 22. FIG. The insertion shaft 24 and the feed shaft 26 connected to the restraining body 10 are positioned substantially coaxially with the branch pipe 2.

  Next, as shown in FIG. 2 and FIG. 3, the movement process will be described. The valve body 5 b is opened by rotating the valve shaft 5 e of the on-off valve 5, and the restraining body 10 is axially moved by the handle 27. It moves to the predetermined location from the accommodating part 22 via the on-off valve 5 (left direction in the figure). By opening the valve body 5b, the fluid in the existing fluid pipe flows in the right direction in the figure. That is, as shown in FIG. 3, the fluid flows from the front side of the restraining body 10 to the rear side of the restraining body 10 through the communication passage R of the bolt 15 and the through hole 23 a penetrating the peripheral wall of the plug cover 23. Distributes to the storage. By doing in this way, the pressure difference by the fluid before and behind the suppression body 10 is eliminated, and the suppression body 10 is easy to move. In particular, the inner diameter of the valve housing 5a of the on-off valve 5 is relatively smaller than the inner diameter of the branch pipe 2, and the outer surface of the O-ring 14 of the deterring body 10 interferes with the inner surface of the valve housing 5a in the moving process, so that the fluid Even when it is difficult to circulate back and forth on the outer surface side of the deterrent body 10, it can be reliably circulated through the communication path R described above.

  In this moving process, the release valve 30 communicating with the opening 22a formed in the accommodating portion 22 is appropriately opened by the operation portion 30a. By doing in this way, the original air in the accommodating part 22 is discharge | released from the opening 31, ie, the original air in the accommodating part 22 and the fluid which flows in into the accommodating part 22 side can be replaced easily, Since it is easy to distribute | circulate to the accommodating part 22 side, the differential pressure before and behind the suppression body 10 can be eliminated immediately. By pulling out the air in the housing part 22, the pressure becomes substantially the same as the water pressure in the pipe, but when the pressure gauge 32 is stably confirmed, the release valve 30 is closed.

  Further, in this moving process, the O-ring 14 interposed between the engagement top 11 and the nut 12 is in an unsealed state to which a compression force described later is not applied, so that the restraining body 10 is being moved. Therefore, there is no risk of contact with and interference with the sleeve portion of the on-off valve 5 or the inner surface of the branch pipe 2.

  When the overhanging portion 11a of the engaging top 11 located on the front side of the restraining body 10 contacts the engaged bolt 3b, the movement of the restraining body 10 to the predetermined position is completed. Thus, the arrangement | positioning to the said predetermined position becomes easy by utilizing the contact | abutting with the overhang | projection part 11a of the engagement top 11 as an engagement part, and the to-be-engaged bolt 3b.

  Further, the feed shaft 26 integrally connected to the handle 27 and the insertion shaft 24 integrally connected to the plug cover 23 screwed to the nut 12 constituting the restraining body 10 are interlocked with the rotation about the axis. Since the joint 27 is connected via the jointless joint 25, the joint 27 is rotated by the jointless joint 25 even when the handle 27 is rotated around the axis when the handle 27 is pressed in the axial direction. The rotation does not interlock with the insertion shaft 24 side, that is, the restraining body 10 can move only in the axial direction without rotating, and the O-ring 14 may be compressed by rotation in the moving process. Can be avoided.

  Next, as shown in FIGS. 4A, 4 </ b> B, and 5, the engagement process will be described. By rotating the non-interlocking joint 25 around the insertion shaft 24, the engagement top 11 is rotated. A force is applied, and the linearly formed inner side wall 11c in the engaging portion 11b of the engaging top 11 comes into contact with the engaged bolt 3b. Then, the inner peripheral wall 11d formed in a curved shape in the engaging portion 11b is moved to the engaged bolt 3b by moving the restraining body 10 in the direction opposite to the moving direction described above by the pressure of the fluid or the operation of the handle 27. Engage along the circumferential direction. By engaging the engaging portion 11b with the engaged bolt 3b in this way, the movement of the engaging top 11 is restricted even in the restraining step described later.

  Next, as shown in FIG. 6, the suppression process will be described. By rotating the non-interlocking joint 25 around the insertion shaft 24, the engaging top 11 engaged with the engaged bolt 3b is used as a reaction force. Utilizing this, the nut 12 is rotated through the plug cover 23. When the nut 12 is screwed into the bolt 15 in a direction approaching the engagement top 11, the O-ring 14 interposed between the members 11 and 12 is compressed in the axial direction of the bolt 15.

  The O-ring 14 is pressed between the back-up ring 13 and the nut 12 that are fitted on the outer periphery of the engagement top 11 and bulges in the outer diameter direction, thereby closely contacting the inner peripheral surface of the branch pipe. It will be in the sealing state which seals the distribution | circulation of the fluid between a surrounding surface and the engagement top 11. FIG. Since the backup ring 13 is rotatably inserted into the engagement top 11, the O-ring 14 rotates together with the backup ring 13 without sliding in the rotation direction even when the nut 12 rotates. As a result, only the axial compressive force is applied. A small O-ring 16 interposed between the rear surface of the engagement top 11 and the front surface of the nut 12 is pinched by the both surfaces to seal the fluid flow.

  The O-ring 14 that seals between the non-sealed state of the O-ring 14 as a sealing member that can move the restraining body 10 toward a predetermined location by the installation device 20 and the inner peripheral surface of the branch pipe 2 at the predetermined location. Since the switchable state can be switched to the sealed state, the O-ring 14 can be disposed at the predetermined position without being damaged as the non-sealed state when the restraining body 10 is moved toward the predetermined position.

  By the end of this engagement step, the fluid flow is suppressed at a predetermined location of the branch pipe 2.

  In the present invention, to suppress the flow of fluid means to completely block the flow of fluid before and after the suppressor 10 or after sealing between the inner peripheral surface of the existing fluid pipe with an annular sealing member. Any aspect of the aspect that allows a relatively small amount of fluid to flow through the communication passage R that passes through the ring of the sealing member is included.

  Next, the removal process will be described. In the state where the flow of the fluid is inhibited by the deterrent body 10 as described above, the installation device 20 is removed from the on-off valve 5 in an uninterrupted state, and the on-off valve 5 is connected to the branch pipe 2. Remove from. Alternatively, the on-off valve 5 may be removed from the branch pipe 2 while the installation device 20 is attached to the on-off valve 5.

  Regarding the removal of the installation device 20, in detail, with the plug cover 23 and the insertion shaft 24 being connected to the restraining body 10, the remaining components of the installation device 20 are removed and the on-off valve 5 is connected to the branch pipe 2. Remove from.

  Subsequently, as shown in FIGS. 7A and 7B, the insertion portion Q of the rotation prevention tool P is inserted into the branch pipe 2 through the flange 2 a of the opened branch pipe 2, and the nut 12 It fits into a groove 12a formed in a concave shape on the outer peripheral surface. Next, the head of the plug cover 23 protruding outward from the flange 2 a of the branch pipe 2 is rotated with a spanner S, and the plug cover 23 screwed into the nut 12 is removed. At this time, since the rotation of the nut 12 is restricted by the anti-rotation tool P, the nut 12 is not rotated together by the rotation operation of the plug cover 23, and the O-ring 14 is compressed with the engagement top 11. The state is maintained.

  After removing the plug cover 23, as shown in FIG. 8, the bolt 15 is screwed into the engaging top 11 and the nut 12, thereby closing the opening 15b of the bolt 15 and the rear surface of the nut 12. A small O-ring 17 interposed between the front surface of the bolt 15 is sandwiched between the two surfaces to seal the fluid flow. By doing in this way, the distribution | circulation of the fluid can be completely interrupted | blocked before and behind the suppression body 10 by the communicating path R. FIG. The head portion 15d of the bolt 15 is formed in a rectangular shape in the axial direction so that it can be easily rotated.

  As described above, the restraining body 10 is connected to the branch pipe 2 from the housing section 22 through the on-off valve 5 by the installation device 20 provided with the housing section 22 for housing the restraining body 10 in a sealed manner and connected to the on-off valve 5. The restraining body 10 is easily installed at a predetermined location by moving it toward a predetermined location and engaging the engaging portion 11b of the engaging top 11 constituting the restraining body 10 at the predetermined location with the engaged bolt 3b. By suppressing the fluid flow, the on-off valve 5 can be removed in an uninterrupted state.

  In addition, an O-ring 14 serving as a sealing member is unsealed in the moving process by the installation device 20 that includes the accommodating portion 22 that accommodates the deterrent body 10 in a sealed manner and communicates with the branch pipe 2 in the attachment process and is connected to the on-off valve 5. The restraining body 10 in a state is moved from the housing portion 22 toward the predetermined location via the on-off valve 5, and the engaging portion 11b of the engaging top 11 constituting the restraining body 10 is engaged at the predetermined location in the engaging step. By engaging the bolt 3b, the O-ring 14 is hermetically sealed in the deterrence step, the fluid flow is sealed, and the flow of the fluid is inhibited by the deterrent body 10 at a predetermined location of the branch pipe 2, so that the continuous flow in the removal step In the state, the on-off valve 5 can be easily removed. In particular, under the stable condition in which the restraining body 10 is engaged with the engaging portion in the engaging process, the O-ring 14 can be sealed in the restraining process without being affected by the pressure of the fluid, and the fluid flow can be sealed. .

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, as a predetermined portion of the existing fluid pipe, the engaged portion is provided at a predetermined portion of the branch pipe 2 branched from the main pipe 1 and the deterrence body 10 is installed. As long as it is a place which can comprise a pipe | tube and can install a suppression body, the predetermined | prescribed place in a main pipe | tube may be sufficient, for example.

  Moreover, in the said Example, although the branch pipe 2 branched substantially orthogonally to the main pipe 1 and the main pipe 1 through which the fluid distribute | circulates is shown as an existing fluid pipe, an existing fluid pipe is an existing pipe line, for example. It also includes a storage case that stores a valve that opens and closes, and the discharge portion may be a predetermined location in order to remove the open / close valve connected through the discharge portion communicating with the storage case.

It is the schematic which showed the attachment process of the on-off valve removal means in the Example of this invention. It is the schematic which showed the movement process. It is the expanded sectional view which showed the communicating path through which the fluid distribute | circulates before and after the suppression body. (A) is a side view of an engagement top, (b) is AA sectional drawing of (a). It is the schematic which showed the engagement process. It is the expanded sectional view which showed the suppression process. (A) is sectional drawing which showed the condition which removes a plug cover in a part of removal process, (b) is BB sectional drawing of (a). It is sectional drawing which showed the condition which inserts a volt | bolt.

Explanation of symbols

1 Main pipe (existing fluid pipe)
2 Branch pipe (existing fluid pipe)
3b engaged bolt (engaged part)
3c Tip 5 Open / Close Valve 10 Suppressor 11 Engagement Top 11a Overhang 11b Engagement 12 Nut 12a Groove 13 Backup Ring 14 O-Ring (Sealing Member)
15 Bolt 20 Installation device 22 Housing part 23 Plug cover 23a Through hole 25 Interlocking joint 27 Handle 30 Release valve 32 Pressure gauge

Claims (5)

An on-off valve removing means for removing the on-off valve connected to the existing fluid pipe in an uninterrupted state,
Provided with an annular sealing member that seals between the inner peripheral surface of the existing fluid pipe at a predetermined location of the existing fluid pipe, and a restraining body that restrains the flow of fluid, and a storage portion that houses the restraining body in a sealed manner. An installation device that is connected to the on-off valve so as to be able to communicate with an existing fluid pipe, and that installs the suppression body at the predetermined location;
The predetermined portion is provided with an engaged portion that protrudes toward the inside of the tube, and the suppression body includes an engaging portion that engages with the engaged portion,
The installation device moves the restraining body from the housing portion toward the predetermined location via the opening / closing valve, and engages the engaging portion of the restraining body with the engaged portion at the predetermined location. On-off valve removal means characterized by comprising:   The on-off valve removing means according to claim 1, wherein a communication passage is formed in the restraining body so as to open and close the predetermined portion side and the accommodating portion side.   The on-off valve removing means according to claim 2, wherein the installation device includes an open valve capable of opening the housing portion.   The installation device is a sealed state of the sealing member that seals between an unsealed state of the sealing member that can move the deterrence member toward the predetermined location and an inner peripheral surface of an existing fluid pipe at the predetermined location. 4. The on-off valve removing means according to claim 1, wherein the on-off valve removing means is switchable. An on-off valve removal method for removing an on-off valve connected to an existing fluid pipe in an uninterrupted state,
Provided with an annular sealing member that seals between the inner peripheral surface of the existing fluid pipe at a predetermined location of the existing fluid pipe, and a restraining body that restrains the flow of fluid, and a storage portion that houses the restraining body in a sealed manner. With an installation device that installs the deterrent body at the predetermined location,
The predetermined portion is provided with an engaged portion that protrudes toward the inside of the tube, and the suppression body includes an engaging portion that engages with the engaged portion,
The installation device is a sealed state of the sealing member that seals between an unsealed state of the sealing member that can move the deterrence member toward the predetermined location and an inner peripheral surface of an existing fluid pipe at the predetermined location. And it is possible to switch,
An attachment step of closing the on-off valve and connecting the installation device to the on-off valve so as to communicate with an existing fluid pipe;
After the mounting step, the opening and closing valve is in an open state and the sealing member is in the non-sealed state, the moving body moving from the housing portion to the predetermined location via the opening and closing valve,
After the moving step, an engaging step of engaging the engaging portion of the deterrent body with the engaged portion at the predetermined location;
After the engagement step, the depressing step of keeping the sealing member in the sealed state and suppressing the flow of fluid;
An on-off valve removal method comprising: a removal step of removing the on-off valve while removing the installation device after the inhibiting step.

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