JP3191103B2 - Valve replacement methods and tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve replacement method and a replacement tool for replacing a valve provided in a connection pipe connected to a pipeline while a fluid is flowing.

[0002]

2. Description of the Related Art Conventionally, as a valve replacement method or a replacement tool for replacing a valve provided in a connection pipe connected to a pipe in which a fluid is flowing while the fluid is flowing,
For example, a tapered female thread is provided inside the distal end of the connecting pipe, and a rod-shaped extension plug having a tapered male thread at the distal end to be screwed to the tapered female thread is inserted through the valve to taper the connecting pipe. After screwing into the screw to seal the connection pipe, tighten the bolts on the connection pipe flange and valve flange,
It is known to loosen a nut and then replace the valve or repair the valve (Japanese Utility Model Laid-Open No. 51-877).
No. 30).

[0003]

The above-described valve replacement method or replacement tool utilizes a hermetic seal by screwing a tapered female screw provided inside the distal end of the connecting pipe and a tapered male screw of an extension plug. The seal was incomplete due to wear of the screw or twisting of the screw due to use, and the fluid flowing through the pipeline might leak, and there was a surface lacking reliability.

[0004] It is an object of the present invention to be able to reliably replace a valve without leakage of fluid while the fluid is flowing.

[0005]

According to the present invention, there is provided a valve replacement method for replacing a valve provided in a connection pipe connected to a pipe through which a fluid flows. Here, the valve to be replaced is one in which the inlet side and the outlet side of the fluid are opened linearly when opened. In such a valve replacement method, first, a lid housing an elastic body is hermetically attached to a flange of the valve while the valve is closed. Then, after the valve is opened, an elastic body is inserted into the connection pipe through the flow path of the valve, and the elastic body is expanded to be airtight, and then the valve is replaced. Since the elastic body expands in diameter in conformity with the inside shape of the connection pipe, it comes into close contact with the inside of the connection pipe and securely seals the connection pipe. Even if the internal shape of the connecting pipe is slightly deformed, the elastic body is flexible and therefore firmly adheres to the inside of the connecting pipe.

Further, the valve replacement tool of the present invention replaces a valve provided in a connection pipe connected to a pipeline through which a fluid flows. Here, the valve to be replaced has the same structure as in the above method. Such a valve replacement tool includes an elastic body that is inserted into the connection pipe and expanded in diameter when the valve is open. The elastic body expands in diameter in conformity with the inner shape of the connection pipe, closely adheres to the inside of the connection pipe, securely closes and seals the connection pipe. Even if the internal shape of the connecting pipe is slightly deformed, the elastic body is flexible and therefore firmly adheres to the inside of the connecting pipe.

Further, the valve replacement tool according to the present invention is connected to a flange of the valve, and has a lid which has an opening on the flange side and has a space for accommodating an elastic body, and which can be slid in an airtight manner with the lid. And a cylindrical body to which the elastic body is fixed at the tip. Furthermore, it penetrates the cylindrical body and the elastic body,
A shaft fixed to the distal end side of the elastic body is provided. An elastic body compression mechanism is provided for moving the cylinder and the shaft relatively to compress the elastic body.

Since the lid is airtightly connected to the flange of the valve, no fluid leaks even when the valve is opened. When the cylinder is pushed in with the valve open, the elastic body comes out of the space of the lid, passes through the valve, and reaches the inside of the connection pipe. Here, when the shaft is relatively moved with respect to the cylindrical body by the elastic body compression mechanism, the elastic body is compressed and expanded in diameter and closely adheres to the inside of the connection pipe, thereby securely sealing the connection pipe.

Further, the valve replacement tool according to the present invention is preferably provided with a projection preventing means for preventing the elastic body from jumping out due to fluid pressure in the pipeline. When the valve is detached from the connecting pipe, the elastic body may jump out. The pop-out preventing means includes two pieces, a first pop-up preventing means for preventing the elastic body from popping out by pressing the cylindrical body, and a second pop-out preventing means for directly pressing the elastic body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a valve replacement method and a replacement tool according to the present invention will be described below in detail with reference to the drawings. 1 to 8, the same or equivalent parts are denoted by the same reference numerals.

FIG. 1 is a partially sectional front view showing an embodiment of a tool used for carrying out a valve replacement method according to the present invention, together with a bypass valve and a bypass pipe. In FIG. 1, the left side from the center line shows a state in which a bypass valve 65 with an exchange tool is fixed to a flange 74 of a bypass pipe (connection pipe) 73, and the right side from the center line shows a bypass pipe flange 74. Shows a state in which a stopper presser pawl 63 is attached to the pressurizing member and a bypass valve 65 is fixed to the presser seat 51 via the no-blow cover 6.

The valve replacement tool according to the present embodiment replaces or repairs a bypass valve 65 which is a ball valve provided in a bypass pipe 73 connected to a pipe through which a fluid flows (hereinafter referred to as a “valve”). Exchange)). Furthermore, the replacement tool of the present embodiment can replace the bypass valve 65 while the fluid is flowing, and includes a sealing means 5 for sealing the bypass pipe 73, and a stopper packing (elastic body) by fluid pressure in the pipeline. Stand puller (first protrusion prevention means) 4 for preventing protrusion of 37
0 and a stopper presser pawl (second protrusion prevention means) 63.

FIG. 2 is a front sectional view showing the sealing means connected to the flange of the bypass valve in the present embodiment. The bypass valve 65 is a ball valve, and the diameter of the inlet side 66 and the outlet side 67 through which the fluid flows are the same,
The opening diameter of the ball 68 is also the same. When the bypass valve 65 is fully opened, the fluid inlet side 66 and the fluid outlet side 67 open directly and linearly with substantially the same diameter. Further, the bypass valve 65 is fixed to a flange 74 provided on the bypass pipe 73 with a hexagon bolt 75.

The sealing means 5 includes a no-blow cover 6 as a lid connected to a flange 69 of the bypass valve 65.
A stopper packing 37 as an elastic body is inserted through the
And a packing presser (cylindrical body) 20 to which is fixed. The no-blow cover 6 has a space 8 that opens toward the flange 69 and houses the stopper packing 37. In the packing presser 20, a stopper packing 37 is fixed to the distal end 21 through a rigid presser plate 22 made of a metal such as a steel plate.

Further, the sealing means 5 includes a packing presser 20.
The shaft 23 is fixed to a metal plate flange 29 made of a rigid plate, for example, a steel plate, which penetrates the stopper packing 37 and is provided on the distal end side of the stopper packing 37. An elastic body compression mechanism that relatively moves the packing presser 20 and the shaft 23 to compress the stopper packing 37 is provided. The elastic body compression mechanism includes, in addition to the packing retainer 20 and the shaft 23, a male screw 24 provided at the other end of the shaft 23 and a hexagon nut 30 screwed thereto, and a washer 32 fitted into the other end of the packing retainer 20. And Note that there is no O between the lot portion 23 b formed on the tip end side of the shaft 23 and the holding plate 22.
A ring 28 is provided.

The stopper packing 37 is made of an elastic material, for example, synthetic rubber or plastic, and is a solid body, but may be a hollow body. Further, as described later, the stopper packing 37 is inserted into the bypass pipe 73 when the bypass valve 65 is in an open state, and tightens the hexagon nut 30 so that the shaft 23 is held between the holding plate 22 and the shaft flange 29. Compressed in the axial direction of
The diameter is increased in a direction orthogonal to the axial direction of the shaft 23.

FIG. 3 is a front sectional view showing a state in which a stand puller is further attached to the sealing means shown in FIG. The stand puller (first pop-out preventing means) 40 includes a split one-sided support 42 and the other side support 47 (shown in FIG. 5) fixed to the flange 74 of the bypass pipe, and one side support 42. Two bolts 53, one end of which is fastened to the high nut 45 via a flat washer 46, two pillar pipes 56 inserted through the pillar bolts 53, and a hook between the two pillar bolts 53 and the pillar pipe 56. And a presser seat 51 to be passed. Here, the right support bolt 5 in FIG.
3. The support pipe 56 and the like are omitted. Presser seat 51
Is a hexagon nut 54 screwed to the other end of the support bolt 53.
Thereby, the support pipe 56 is pressed between the support nut 56 and the high nut 45.

Further, as shown in FIG. 1, the stand puller 40 is provided with a stand 57 fixed to the presser seat 51 with a hexagon bolt 58. A female screw (not shown) is provided at the center of the horizontal portion 57a of the stand, and a screw rod 59 is screwed into the female screw. The screw rod 59 is fixed with a lock nut 60. A joint 6 is provided at the tip of the screw rod 59.
1 is attached. The other end 23a of the shaft 23 is connected to the joint 61 as shown by a two-dot chain line, so that the rotation of the screw rod 59 is transmitted.

FIGS. 4A and 4B show one support of the present embodiment, wherein FIG. 4A is a plan view and FIG. 4B is a front view. One of the support receivers 42 has left and right locking portions 43 having locking pieces 43a that lock on the lower surface of the flange 74 of the bypass pipe,
It has a semicircular ring portion 44 for connecting them, and a high nut 45 fixed to the locking portion 43. In the locking portion 43,
A bolt hole 43b for connecting to the other support is provided. In the center of the ring portion 44, a locking pawl 44a that locks on the lower surface of the flange 74 of the bypass pipe is provided.

FIG. 5 shows the other strut receiver used with one strut receiver of FIG. 4, wherein (A) is a plan view,
(B) is a front view. The other column support 47 has left and right locking portions 48 having locking pieces 48a locked to the lower surface of the flange 74 of the bypass pipe, and a semicircular ring portion 49 connecting these. The locking portion 48 is provided with a female bolt 48b for connecting to one of the column receivers 42. In the center of the ring portion 49, a locking pawl 49a that locks on the lower surface of the flange 74 of the bypass pipe is provided.

FIGS. 6A and 6B show a presser seat according to the present embodiment. FIG. 6A is a plan view, and FIG. The presser seat 51 has an insertion hole 51a in the center through which the shaft 23 shown in FIG. 1 is inserted, and the no-blow cover 6 shown in FIG.
Hole 51b through which the stud 13 is inserted
And a female screw 51c into which a hexagonal bolt 58 for attaching the stand 57 is screwed, and an insertion hole 51d through which the support bolt 53 is inserted.

FIG. 7 is a front sectional view showing a state in which the valve is removed from the state shown in FIG. 3, fixed to the holding seat, and the second protrusion preventing means is attached. The replacement tool for the present valve includes a stopper presser pawl 63 that is a second protrusion prevention means. The stopper retainer pawl 63 is divided into two parts, and is fixed to the flange 74 of the bypass pipe with a bolt 75.

FIGS. 8A and 8B show a stopper pressing pawl according to the present embodiment, wherein FIG. 8A is a plan view and FIG. 8B is a front sectional view. The pair of stopper retainer pawls 63 press the retainer plate 22 at the tip of the pawl portion 64. In addition, stopper presser
When the pawl 63 is attached to the flange 74, the pawl 64
Is downward, but in FIG. 8, for convenience,
It is painted.

Next, a procedure for replacing a valve using the replacement tool of the present embodiment will be described. This valve replacement procedure relates to a ball valve provided as a bypass valve in a valve provided in the middle of a pipe through which, for example, city gas flows as a fluid. This will be described with reference to FIGS.

As shown in FIG. 1, (1) The lever for operating the ball 68 of the bypass valve 65 is released, and the column supports 42 and 47 are attached to the flange 74 of the lower bypass pipe 73. At this time, the support 4
Attach so that 2, 47 is horizontal to the lower side of the flange. In addition, the bolts and nuts for mounting the bypass valve should be installed at a position where they can be easily removed. (2) After confirming that the bypass valve 65 is fully closed, the blind flange (not shown) fixed to the upper flange 69 of the bypass valve 65 is removed.

As shown in FIG. 2, (3) the no-blow cover 6 of the sealing means is attached to the upper flange 69 of the bypass valve. (4) With the small ball valve 17 of the no blow cover 6 slightly opened, the bypass valve 65 is slowly opened,
The air in the no-blow cover 6 is dissipated. After the air has been released, the small ball valve 17 is fully closed, and an airtight test is performed by attaching the no-blow cover 6.

As shown in FIG. 1, (5) a support bolt 53, a support pipe 56, a holding seat 51,
Stand 57 with screw rod 59 and joint 61
Is attached to the support bolt 53. (6) Tighten the screw rod 59 of the stand 57 and lower the stopper packing 37 until the joint 61 hits the presser seat 51. At this time, the stopper packing 37 is carefully checked for being caught or twisted.

As shown in FIGS. 3 and 7, (7) While holding the adapter 25 with a spanner,
Tighten the hexagon nut 30 screwed into 4. (8) Open the small ball valve 17 of the no-blow cover 6 and check the sealing property of the stopper packing 37 of the sealing means. (9) Remove the hexagon bolt 75 to which the bypass valve 65 is attached, and remove the bypass valve 65 by, for example, 120 m.
Then, slide it upward and fix it to the presser seat 51 with the stud bolt 13 and the M8 hexagon nut 14. (10) Here, for example, the O-ring 76 of the flange 74 of the bypass pipe is removed, and the O-ring groove is cleaned and inspected. (11) Attach two stopper presser claws 63. (12) Loosen the screw rod 59 of the stand a little, and confirm the stopper packing 37 is fixed and airtight. (13) Remove the stand 57 together with the bypass valve 65. (14) Insert a new O-ring 28 into the airtight stopper and replace the bypass valve 65 if necessary. (15) No-blow cover 6 and bypass valve 65
Is attached and fixed.

As shown in FIG. 1, (16) Tighten the screw rod 59 until the joint 61 hits the presser seat 51. (17) Remove the stopper pressing claws 63 and attach the O-ring to the flange 74 of the bypass pipe. (18) The bypass valve 65 is attached to the flange 74 of the bypass pipe with the no-blow cover 6 attached. (19) After the hexagon nut 60 of the threaded rod 59 is loosened and the air in the bypass valve 65 is diffused from the small ball valve 17, an airtight test of the mounting portion of the bypass valve 65 is performed. (20) Loosen the screw rod 59 of the stand, and pull up the stopper packing 37 using gas pressure. (21) After the stopper packing 37 is completely raised, the bypass valve 65 is fully closed. (22) Bypass valve 65 by small ball valve 17
Check the closing sealability of. (23) The support bolt 53 and the support pipe 56 are removed. (24) No-blow cover 6, stopper packing 37
Remove it. (25) Attach a blind flange to the bypass valve 65, open the bypass valve, and perform an airtight test of the blind flange attachment portion. (26) Remove the column supports 42 and 47. (27) Attach the lever to the bypass valve 65 and fully close it. (28) Check if any tools are left in the pit.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to only those embodiments, and various modifications may be made without departing from the spirit of the present invention. In addition, it goes without saying that a wide variety of modifications can be made.

[0031]

According to the present invention, the valve can be reliably replaced without leakage of the fluid while the fluid is flowing.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a tool used for carrying out a valve replacement method according to the present invention, together with a bypass valve and a bypass pipe.

FIG. 2 is a front sectional view showing a sealing unit connected to a flange of a bypass valve according to the embodiment.

FIG. 3 is a front sectional view showing a state in which a stand puller is further attached to the sealing means shown in FIG. 2 and an upper portion of the stand is omitted.

FIG. 4 shows one support of the present embodiment,
(A) is a plan view and (B) is a front view.

5A and 5B show another support used together with one support of FIG. 4, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

FIGS. 6A and 6B show a presser seat according to the present embodiment, wherein FIG. 6A is a plan view and FIG.

7 is a front sectional view of a state in which a bypass valve is removed from the state of FIG. 3, fixed to a holding seat, and a stopper holding pawl is attached.

8A and 8B show a stopper pressing pawl in the present embodiment, wherein FIG. 8A is a plan view and FIG. 8B is a front sectional view.

[Explanation of symbols]

 Reference Signs List 5 sealing means 6 no blow cover (lid) 8 space part 20 packing presser (cylindrical body) 21 tip 23 shaft 37 stopper packing (elastic body) 40 stand puller (first protrusion prevention means) 63 stopper presser (second) 65 Bypass valve (valve) 66 Inlet side 67 Outlet side 69 Flange 71 Flow path 73 Bypass pipe (connection pipe)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jin Shibusawa 1109 Yajima, Meiwa-cho, Oraku-gun, Gunma Prefecture Inside Daimei Metal Industry Co., Ltd. 56) References JP-A-3-89091 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 43/00

Claims (4)

(57) [Claims] (1)A connecting pipe is connected to the pipeline through which fluid is flowing.
To replace the bypass valve provided in the connection pipe
In the law, First, with the bypass valve closed, retract the elastic body.
Take the closed lid tightly into the flange of the bypass valve
Attached Next, a first protrusion preventing means is attached to the connection pipe.
Open the bypass valve and open the bypass valve
The elastic body is inserted into the connection pipe through the flow path of
When the elastic body is expanded and brought into close contact with the inner surface of the connection pipe,
In addition, the first protrusion preventing means allows the elasticity to be reduced.
While preventing the body from jumping out by the fluid pressure in the conduit,
Remove the bypass valve from the connection pipe, Next, a second protrusion preventing means is attached to the end face of the connection pipe.
And the elastic body pops out due to the fluid pressure in the pipeline.
Stop the flow of fluid in the pipeline while preventing
Replace the bypass valve Characterized by
How to replace the valve. 2. The method according to claim 1, wherein the lid includes the lid.
Provide a small valve that communicates with the space that stores the elastic body,
The elastic body is expanded in the connection pipe, and the connection pipe inner wall is formed.
When the small valve is opened,
A method for exchanging a valve, which comprises checking a sealing property of a body . (3)A connecting pipe is connected to the pipeline through which fluid is flowing.
A bypass valve provided in the connection pipe,
Valve for changing the fluid flow without stopping
Replacement tool, With the bypass valve closed, the bypass valve
Airtightly attached to the lunge, Open to the flange side
Having a space for accommodating the elastic body
And the elastic body is inserted into the lid so as to be slidable in an airtight manner.
Is fixedWasA cylinder, penetrating through the cylinder and the elastic body;
Fixed to the tip side of the elastic bodyWasShaft and, Open the bypass valve and pass through the flow path of the bypass valve.
When the elastic body is inserted into the connection pipe,
Move the cylinder and the shaft relatively to move the elastic body
Compress and expand Elastic body compression mechanismWhen, Attached to the flange of the connection pipe, the elastic body is
When the diameter is expanded in the connecting pipe and it comes into close contact with the inner wall of the connecting pipe
In addition, the elastic body is prevented from jumping out due to the fluid pressure in the pipeline.
First jump-out preventing means for stopping, When the bypass valve is removed from the connection pipe
The elastic body is attached to an end face of the connection pipe, and the elastic body is connected to the pipe line.
2nd prevention to prevent jumping out due to fluid pressure inside
Means, including Replacement tool for valve. 4. The method according to claim 3, wherein the lid includes the lid.
A small valve communicating with the space is provided.
Replacement tool for valve.