JPH0743068B2 - Pipe fitting with shut-off valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe joint useful for newly installing a shutoff valve on an existing pipe such as an underground gas pipe,
More specifically, the so-called no-blow method is used for mounting the shutoff valve on the existing pipe by dividing the existing pipe into a pipe without supplying a bypass pipe to the existing pipe and flowing the fluid through the existing pipe. The present invention relates to a pipe joint provided with a shutoff valve that can be easily performed.

That is, in order to install a new shutoff valve for an emergency shutoff on the existing pipe, it is necessary to divide the existing pipe into two parts at the shutoff valve mounting portion, and with this, the external ejection of the fluid inside the gas pipe cannot be avoided, and the Since it is not possible to stop the supply of the shutoff valve, in general, after arranging the bypass pipe on the existing pipe to which the shutoff valve should be attached, perform the valve installation work, then remove the bypass pipe, and if it is a buried pipe, refill the ground. I have to. For this reason, the work is complicated and costly.In the case of the above-mentioned buried pipe, large-scale excavation work is required to excavate the ground widely to remove the bypass pipe, and in some places it is not possible to excavate it extensively. The installation of valves was sometimes restricted.

The present invention has been made in view of the above circumstances, and not only can the installation work be performed without the need for bypass piping, but also the reliability of the shutoff performance at the time of operation of the shutoff valve attached to the existing pipe. It is an object of the present invention to provide a pipe joint provided with a shut-off valve capable of increasing the pressure.

That is, the present invention, the existing pipe that is gripped by the joint body that has a receiving port that is larger in diameter than the outer diameter of the existing pipe in the axial middle portion is divided into two parts within the joint body, and the divided existing pipe is divided. The respective pipe ends of the above are projected to the center side of the receiving port rather than the inner peripheral surface of the receiving port, and are provided on the sealing piece made of rubber packing at each pipe end of the divided existing pipe. By internally fitting the positioning rib, the piece is attached to the pipe end so as to contact the end face of the pipe end, and
The rear surface of each of these pieces is a sealing surface that is inclined so as to gradually separate as it approaches the receiving port, and is formed between the valve hole provided in each piece and the sealing surface of each piece. The existing pipe flow path separated through the sealing hole is connected, and the opening / closing cover body is attached to the receiving port, and the inner position of the cover body and the sealing hole are projected into each of them. It is characterized in that a closure that can be opened / closed between the sealing surfaces of the bridge body and a position where the sealing surface is press-fitted is connected to an operation portion that penetrates the cover body and is taken out to the outside.

Hereinafter, the details of the present invention will be described with reference to the drawings.

1 to 4 show a split type pipe joint showing an embodiment of the present invention, in which the joint body 1 has an upper mold body 1a having an inner peripheral surface shape matching the outer peripheral surface shape of an existing pipe 2 and a lower mold body 1a. Includes the mold body combination configuration of mold body 1b, upper mold body 1a and lower mold body 1b
Is fitted to the shut-off valve mounting portion of the existing pipe 2 by sandwiching the pipe from the opposite direction, and the joint flanges 3a and 3b along the axial direction of the two are fastened by bolts 4 so that the joint body 1 becomes the existing pipe 2. Grab.

On the inner peripheral portion of the joint body 1 near both ends, ring-shaped peripheral surface sealing material 7 and balls, which are partially cut into fitting grooves 5 and 6 formed in parallel with the mold bodies 1a and 1b, respectively. A band (or retaining ring) 8 is fitted, the peripheral sealing material 7 controls the outer peripheral surface of the existing pipe 2, and a ball band (or retaining ring) 8 is applied to the existing pipe 2 in the axial direction. And, it controls the action of blocking the compressive stress.

The existing pipe 2 is divided into right and left portions at a position corresponding to a substantially central portion in the joint body 1, and a receiving port 9 formed of an annular upward hanging wall is formed in the upper mold body 1a from the outer diameter of the existing pipe in correspondence with the divided portion. Is also formed with an opening having a large inner diameter, and a cap-shaped hermetic cover body 10 is fitted into and fixed to the receiving port 9. Reference numeral 11 denotes a threaded portion between the receiving port 9 and the sealing cover body 10 for this fixing.

Sealing pieces 13 and 13 made of rubber packings 12 and 12 are attached to the respective pipe ends 2a and 2a of the existing pipes 2 and 2 that are divided so as to be in contact with the end surfaces of the pipe ends 2a and 2a. Each rubber packing 12, 12 is a member that is in contact with the pipe ends 2a, 2a on the side facing each other and has a diameter larger than the existing pipe outer diameter, and the valve holes 15, 15 concentric with the pipe axis penetrate through the central portion. The sealing surfaces 14a, 14a, which are installed and are formed so that the back surfaces of the rubber packings 12, 12 facing each other gradually separate from each other as they approach the receiving port 9, are widened upward in the parts. Holes 14 are formed. 12a
Is a small rib for positioning, and is fitted inside the pipe end with a rubber packing.
Position 12

On the other hand, in the inner chamber of the cap-like closed cover body 10 described above, a substantially pyramid-shaped closure 16 with its sharp side facing downward is suspended by a rotating shaft 17. The rotary shaft 17 penetrates the ceiling wall portion 10a of the hermetically sealed cover body 10 inward and outward in a rotatable state, and its external protruding portion is a prismatic rotary operation portion 17a into which a rotary operation tool (not shown) is fitted. This is covered with a plastic cap 18 which is freely fitted and removed from the top wall boss portion 10b, while the inner projecting portion is a screw shaft 17b, and a screw hole 16a is formed in the center of the closure 16. Screw into. The closure 16 is in a state in which its rotation is blocked by a well-known detent means (not shown). Therefore, the rotation of the rotary shaft 17 promotes the upward movement or the downward movement of the closure 16.

In the figure, 19 is an insulating layer formed on the inner peripheral surface of the mold bodies 1a, 1b, 20a, 20b, 20c are O-rings, 17c is a retaining collar of the rotary shaft 17, and 21 is a C-shaped retaining ring. Is.

In the above structure, the closure 16 is normally pulled up to the inner chamber of the closed cover as shown in FIG. 1, and the fluid, for example gas, in the existing pipe 2 flows through the valve holes 15 and 15. When shutting off, remove the cap 18 and expose the exposed rotary operation part 17
Fit a rotary operation tool such as a wrench on a and rotate the rotary shaft 17,
The closing member 16 is moved downward (closed), and is inserted into and pressed into the sealing hole 14. The closure 16 is a substantially pyramid as described above, and by press-fitting it, the tapered sealing surfaces 14a, 14 of the sealing hole 14 are formed.
The valve holes 15 and 15 are closed in contact with a, and both rubber packings 12 and 12 are pressed in opposite lateral directions by the wedge effect, and the tube ends 2a and 2a are strongly sealed by the compression force. As a result, the flowing gas is blocked in its flow, and the required shut-off operation is obtained (Fig. 2). Of course, the disconnection is released by pulling up (opening) the closure 16.

The pipe joint having such a shut-off valve can be attached to the existing pipe 2 while the gas supply to the existing pipe 2 as the body to be attached is stopped by providing a bypass circuit. The receiving port 9 has an inner diameter larger than the outer diameter of the existing pipe 2, and the sealing cover body 10 is screwed to the receiving port 9 from the outside, and the shutoff valve is attached to the sealing cover body 10. Even if the rotary shaft 17, the closure 16, the cap 18, etc., which are the main components of the above, are installed and unitized in advance at the factory production stage, there is no obstacle to the joint body 1 through the socket 9 by the screwing operation at once. Can be installed, and the sealing piece 13 is a pair of rubber packing
Considering that it consists of 12,12 and can be set between the existing pipe dividing end faces through the socket 9 without any obstacle,
The following installation work to the existing pipe 2 by the no-blow method is most suitable.

That is, the installation work by the no-blow method is performed in the following procedure.

First, at the location where the shutoff valve of the existing pipe 2 is installed, the upper mold body 1a
The lower pipe main body 1b is attached and the existing pipe 2 is held by the joint main body 1. After that, a shutter device as shown in FIG.
The no-blow device 23 is attached via 22. The no-blowing device 23 is provided with a relatively large inner chamber, and a rubber film having a radial slit engraved therein is attached to the entrance thereof. Therefore, even when inserting an arm or object into the inner chamber while pushing the radial slit portion open. The structure is such that the inlet is kept airtight. Next, the saw is inserted into the no-blow device 23, the shutter device 22 is opened to divide the existing pipe 2 into two pieces, and the cut pieces are adsorbed to the magnets to be removed. Although the saw for this division is larger than the outer diameter of the existing pipe, the inner diameter of the receiving port 9 is also large, so that there is no obstacle in inserting the saw. After that, the shutter device 22 is closed and inserted into the no-blowing device 23, or the rubber packing 12, 12 that has been inserted in advance is loaded by opening the shutter device 22 and similarly receiving the valve unit preassembled as described above. The shutter device 22 and the like are removed by fitting and fixing it in the mouth 9. According to this no-blow method, it is not necessary to stop the flow of gas in the existing pipe 2, so that bypass piping is not involved.

In addition, after the construction, the blocking performance against the amount of the existing pipe 2 pulled out can be dealt with by setting the cone-shaped gradient angle of the closure 16 to a pure angle, but according to the test results, the valve sealing performance and the existing pipe 2 are Due to the restriction of the inner diameter of the cut perforation, the inclination angle range of 8 to 25 degrees was appropriate. According to this test result, the blocking performance for the internal air pressure of 1 kg / cm ² is as follows, and there is no leakage (overflow gas) due to expansion and contraction of the existing pipe 2.

FIG. 6 shows the construction of another embodiment of the present invention, in which the retaining pin 26 is inserted over the square rotary wheel 24 placed on the upper part of the boss portion 10b and the stopper rod 25 having the head thereof. Further, an engaging protrusion 25a is bulged at one position on the lower end portion of the stopper rod 25 to form a key portion 27 at that portion. On the other hand, a stepped portion 28 is formed on the upper surface of the closure 16, and a lid 29 is overlaid on the stepped portion 28 and bolted 30, and a keyhole 31 of the lid 29 as shown in FIG.
The key portion 27 inserted through the stepped portion 28 is engaged with the lower surface of the lid body, and the compression coil spring 32 is interposed between the closure 16 and the cover body top wall portion 10a.

According to this, in an emergency, when the rotating wheel 24 is rotated and the key portion 27 is aligned with the position where the key portion 27 comes out of the key hole 31, the compression coil spring 32 causes the closure 16 to suddenly rush into the sealing hole 14 and shut off. Leading to.

In order to release the interruption, an auxiliary rod 33 having the same diameter as that of the rod is connected to a screw hole 25b provided at the upper end of the stopper rod 25, and then the retaining pin 26 is removed to cover the stopper rod 25 with a hermetic cover. Body 10
After pushing it in and inserting the key portion 27 into the key hole 31 again, the engaging projection 25a is engaged with the lower surface of the lid by rotating the stopper rod 25. Further, as shown in FIG. 8, a tower base 34 is erected on the joint body 1, and the upper half of the auxiliary rod 33 is screwed from the bottom of the stand.
The nut body 35 is threaded through the insertion end 33a, and the stopper rod 25 and the closure 16 are pulled up against the compression coil spring 32 by rotating the nut body 35, and the retaining pin 26 is again rotated. It penetrates 24 and the stopper rod 25 to maintain the initial state.

When the structure shown in Fig. 6 is attached to the existing pipe 2 by the no-blow method, the rotary wheel 24
In order to prevent the stopper rod 25 from rotating and the closure 16 from protruding, the screw hole 25b of the stopper rod 25 is used to attach an appropriate anti-rotation tool, and this tool prevents the above-mentioned unintentional rotation and the valve unit. Shall be fitted in and fixed to the receptacle 9.

The pipe joint provided with the shut-off valve according to the present invention is such that each pipe end of the existing pipe divided into two parts in the joint main body has an inner circumference of the receiving port having a diameter larger than the outer diameter of the existing pipe provided in the joint main body. Since it projects more toward the center of the receiving port than on the surface, it is possible to adopt the installation construction of the shutoff valve by the no-blow method as described in the embodiment. In addition, the pipe joint provided with the shutoff valve according to the present invention has the function of opening and closing the existing in-pipe flow passage required for the shutoff valve because the closure opens and closes when the operating portion is operated.

And, in particular, the pipe joint provided with the shutoff valve according to the present invention is not limited to the fact that the shutoff valve can be installed and installed by the no-blowing method, and that the shutoff valve is provided with the opening / closing function of the existing pipe flow path. Also, the reliability of the shutoff performance can be improved when the shutoff valve is operated at the location where the shutoff valve is attached.

That is, in the pipe joint provided with the shutoff valve of the present invention, the ribs for positioning provided in the sealing piece body made of the rubber packing are fitted in the respective pipe ends of the existing pipes that have been divided, and Since the body is directly attached to the pipe end so as to be in contact with the end face of the pipe end, and a seal is press-contacted to the sealing surface of each of these pieces to shut off the existing pipe flow path, As long as the closure is in pressure contact with the sealing surface of the bridge body, it is located at another location, for example, between the outer peripheral surface of each existing divided pipe and the inner peripheral surface of the joint body (in FIG. 1, the seal member 7 is Even if the sealing performance of the intervening part) is impaired, there is no room for fluid leakage from that part, which increases the reliability of the shutoff performance when the shutoff valve is operated at the place where the shutoff valve is installed. Of.

[Brief description of drawings]

The drawings show the details of a pipe joint provided with a shutoff valve according to the present invention, and FIG. 1 is a vertical cross-sectional view of an embodiment of the valve-opening state,
FIG. 2 is a vertical sectional view of the same valve closed state, and FIG.
III-III line sectional view, FIG. 4 is a perspective view of the rubber packing, FIG. 5 is an explanatory view of the installation and construction of the existing pipe by the no-blow method, and FIG. 6 is a vertical cross section of another embodiment. FIG. 7 and FIG. 7 are plan views of the essential parts of FIG. 6, and FIG. 8 is an explanatory view of the case of returning operation of the valve in the structure of FIG. 1 ... Joint body 2 ... Existing pipe 9 ... Sealing cover body 13 ... Sealing piece body 14 ... Sealing hole 15 ... Valve hole 16 ... Closure 17a ... Rotating operation part 24 ... Rotating wheel (rotating operation part)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-92916 (JP, A) Actual development S57-1799659 (JP, U) JP-B-51-31691 (JP, B2)

Claims (1)

[Claims] Claim: What is claimed is: 1. An existing pipe, which is gripped by a joint main body having a receiving opening larger in diameter than the outer diameter of the existing pipe in an axially intermediate portion, is divided into two parts within the joint main body, Each pipe end is projected to the center side of the receiving port rather than the inner peripheral surface of the receiving port, and each divided pipe end of the existing pipe is equipped with a sealing piece made of rubber packing. By internally fitting the positioning ribs, the piece is attached to the tube end so as to contact the end surface of the tube end, and the rear surface of each piece gradually separates as it approaches the receiving port. The slanted sealing surface is formed as described above, and the existing pipe flow path is divided through the valve hole provided in each piece and the sealing hole formed between the sealing surfaces of each piece. It is in communication, the sealing cover is attached to the above-mentioned receiving port, A closure that can be opened and closed between the inner chamber position of the cover body and the position where the cover body projects into the sealing hole and is press-fitted between the seal surfaces of the respective piece bodies, penetrates the cover body. A pipe joint equipped with a shutoff valve, characterized in that the pipe joint is connected to an operation unit that is taken out to the outside.