JP5150556B2 - Ball valve - Google Patents

Description

  The present invention attaches and fixes a branch joint with a saddle to a branch portion of a main pipe through which a fluid such as a water pipe or gas pipe flows, and then drills a branch hole on the wall surface of the main pipe with a hole saw to connect a live pipe branch That is, the present invention relates to a ball valve used when connecting branch pipes without stopping fluid such as tap water and gas flowing in the main pipe.

  With regard to branch joints, as a joint that has a valve function to stop the fluid supply when the branch pipe of the branch pipe can be made without stopping the fluid supply on the main pipe side and the fluid supply to the branch pipe becomes unnecessary, There is a saddle type electrofusion joint with a seal plug (hereinafter referred to as “saddle type EF joint”) (see Patent Documents 1 and 2).

This type of saddle type EF joint is connected to the main pipe 100 as shown in FIGS.
(1) As shown in FIG. 8, the saddle part 210 of the saddle type EF joint 200 is electrically fused to the outer wall surface of the synthetic resin main pipe 100 and is screwed to the male screw cylinder part 221 at the tip of the branch pipe part 220. Remove the cap (not shown).
(2) As shown in FIG. 8, the ball valve 300 has its female screw portion 320 screwed to the male screw cylinder portion 221 and the ball valve body 310 is closed.
(3) As shown in FIG. 8, the branch pipe 400 is connected to the branch pipe portion 230, and the other end of the branch pipe 400 is not shown, but water is stopped with a faucet or a cap.
(4) Although the hole saw body 500 of the hole saw device shown in FIG. 9 is not shown, the cap portion (not shown) of the hole saw device inserts the end of the ball valve 300 into the male threaded cylindrical portion 221. A hole saw device is installed so that it closes in the water stop state.
(5) As shown in FIG. 9, the ball valve body 310 is opened, and the hole saw body 500 is inserted into the branch pipe portion 220 until the tip of the hole saw body reaches the wall surface of the main pipe 100.
(6) Although not shown, the support shaft 510 of the hole saw body 500 is rotated around the bearing using a tool such as an electric drill connected to the end of the support shaft 510, as shown in FIG. In addition, the through hole 110 is formed in the wall surface of the main pipe 100 by the hole saw body 500.
(7) As shown in FIG. 10, the hole saw body 500 together with the perforated piece is retracted to the upper side from the ball valve body 310, and then the ball valve body 310 is closed.
(8) Although not shown, after removing the hole saw device, the seal plug is inserted into the ball valve 300, then the ball valve body 310 is opened, and the seal plug is inserted into the branch cylinder portion 220 to branch. The internal thread part 222 provided in the cylinder part 220 is screwed together so that the upper side of the branch pipe part 230 of the branch cylinder part 220 is in a water-stopping state.
(9) The tool and the ball valve 300 are removed, and a cap is attached to the open end of the branch cylinder part 220, although not shown.

  That is, if the saddle type EF joint 200 and the ball valve 300 are used, the branch pipe 400 is connected to the main pipe 100 in the active pipe state, that is, in the case of water, the water flowing on the main pipe 100 side in an undisrupted water state. Can do. If the cap is removed, the seal plug is further screwed into the main pipe side, and the flow of fluid from the main pipe 100 side to the branch pipe portion 220 side is stopped, the water flowing through the main pipe 100 side is kept in an undisturbed state. The water faucet can be replaced on the side.

By the way, as described above, the ball valve 300 is attached to the saddle type EF joint 200 by screwing the female screw part 320 into the male screw cylinder part 221 of the saddle type EF joint 200. May be mounted in a state in which the female screw portion 320 is screwed obliquely.
However, when the female screw part 320 is screwed into the male screw cylinder part 221 at an angle as described above, the conventional ball valve 300 is formed of gunmetal for the most part including the female screw part 320. Thus, the thread of the male screw cylinder 221 made of synthetic resin or the like is crushed.
If drilling is performed with the hole saw device as it is, the ball valve 300 may be detached due to the reaction force of drilling, and drilling may not be possible.
On the other hand, it can be seen that the screw has been screwed obliquely, and once the ball valve 300 is removed and the female screw part 320 is to be screwed into the male screw cylinder part 221, the screw thread of the male screw cylinder part 221 is crushed and is not attached straight. Absent.
Therefore, there is a problem that the branch pipe 400 cannot be connected using the saddle type EF joint 200.

On the other hand, if the ball valve is made of resin, it can be solved that the screw thread of the male threaded cylindrical portion 221 of the saddle type EF joint 200 is crushed even when screwed obliquely as described above. Since the strength is weaker than the above, the distance between the faces of the bulb must be increased.
Therefore, the insertion length of the hole saw main body becomes long, and a new problem arises that a commercially available hole saw device cannot be used.

JP 2008-180373 A JP 2009-029484 A

  In view of the above circumstances, the present invention can prevent the screw thread of the male threaded cylindrical portion of the saddle type EF joint from being crushed even if it is screwed obliquely, and the surface of the valve can be made of conventional gunmetal. It aims to provide a ball valve that can be the same.

  In order to achieve the above object, a ball valve according to the present invention is a saddle-type branch joint having a female threaded portion that is screwed into a male threaded cylindrical portion provided at the tip of a branch pipe portion of a saddle-type branch joint made of synthetic resin. A ball valve used for live pipe branch connection to a pipe, comprising: a screw tube member made of synthetic resin having the female screw portion; and a screw tube member fitting portion into which at least the female screw portion of the screw tube member is fitted. It has the metal main body member which has.

The ball valve of the present invention is preferably provided with an insertion guide portion having an inner diameter substantially the same as or slightly larger than the outer diameter of the male screw cylinder portion screwed into the female screw portion at the insertion side end portion of the male screw cylinder portion.
The length of the guide tube portion is preferably shorter as long as it can be guided so as not to be screwed obliquely.

The guide tube portion may be formed integrally with the screw tube member.
If the screw tube member can be fixed to the main body member, the fixing method is not particularly limited, but the screw pin is screwed into the main body member, and the spring pin is attached to the main body to prevent the screw tube member from rotating. It is preferable that the member is elastically fitted into a hole penetrating from the member to the screw tube member.

Examples of the material of the main body member include gun metal, a copper alloy such as brass, or a metal material such as stainless steel.
The material of the screw cylinder member is not particularly limited as long as it is a synthetic resin constituting a saddle type EF joint or a synthetic resin having a hardness close to that of a synthetic resin constituting a saddle type EF joint. For example, polyethylene, polyvinyl chloride, etc. Is mentioned.

  The ball valve of the present invention is used for a live pipe branch connection to a main pipe of a saddle-type branch joint having a female thread part that is screwed into a male thread cylinder part provided at the tip of a branch pipe part of a saddle-type branch joint made of synthetic resin. A synthetic resin screw cylinder member having a female screw portion, and a metal main body member having a screw cylinder member fitting portion into which at least the female screw portion of the screw cylinder member is fitted. Therefore, even if it is screwed at an angle, it is possible to reduce the crushing of the threaded portion of the male threaded cylinder portion of the saddle type EF joint, and to make the space between the valves the same as that of a conventional gun metal be able to.

It is a front view of one embodiment of a ball valve concerning the present invention. It is sectional drawing showing the state which opened the ball valve body of the ball valve of FIG. FIG. 2 is a cross-sectional view showing a state in which the ball valve of FIG. 1 is attached to a saddle type EF joint and the ball valve body is closed. It is sectional drawing which attaches a hole saw apparatus to a ball valve and represents the state just before a drilling operation. It is sectional drawing of a seal plug. It is a partially cutaway sectional view of a construction completion state of a saddle type EF joint. It is sectional drawing explaining the water stop state of the branch pipe part by a seal plug. It is sectional drawing which represents typically the state attached to the saddle type EF coupling of the conventional ball valve. It is sectional drawing explaining the state which drills a through-hole in the main pipe which is a post process of FIG. FIG. 10 is a cross-sectional view illustrating a post-process in FIG. 9.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 and 2 show an embodiment of a ball valve according to the present invention.

As shown in FIGS. 1 and 2, the ball valve A is formed by assembling a main body member 1 and a screw cylinder member 2.
The body member 1 is a combination of a valve body housing member 3 made of a metal material such as gunmetal, a copper alloy such as brass, or stainless steel, a valve body pressing member 4, a ball valve body 5, and an operation handle 6. Yes.

  The valve body housing member 3 includes a male threaded cylinder part 31 for connecting a tool, a valve body housing recess 32, and a female threaded cylinder part 33 into which the male threaded part 41 of the valve body pressing member 4 is screwed.

  An operation shaft 61 connected to the operation handle 6 is inserted into the wall surface of the valve body housing recess 32, and the ball valve body 5 is housed rotatably around the operation shaft 61.

The valve body pressing member 4 includes a male screw portion 41, and a female screw portion 42 and an enlarged diameter cylindrical portion 43 serving as a screw tube member fitting portion into which a fitting portion 2a of the screw tube member 2 described later is fitted. Yes.
The valve body pressing member 4 is integrated with the valve body housing member 3 in a state in which the ball valve body 5 is housed by the male thread portion 41 being screwed into the female thread cylinder portion 33 of the valve body housing member 3. Yes.
In the wall surface of the enlarged diameter cylindrical portion 43, two fitting holes 43a that are vertically drilled toward the central axis are drilled at symmetrical positions.
In FIG. 2, 11 and 31a are O-rings, and 12 and 13 are ball sheets made of metal or carbon.

The screw cylinder member 2 is made of polyvinyl chloride and includes a fitting portion 2a and a tightening tool locking portion 2b.
The fitting portion 2 a includes a male screw portion 21, a female screw portion 22, and a flange portion 23.

The male screw portion 21 has a screw diameter that is screwed into the female screw portion 42 of the valve body pressing member 4.
The female screw portion 22 has a screw diameter with which a male screw cylinder portion 71a provided in a branch pipe portion 71 of a saddle type EF joint 7 which is a saddle type branch joint described later is screwed.

The flange portion 23 has the same outer diameter as the inner diameter of the enlarged diameter cylindrical portion 43, and the length of the screw cylinder member 2 in the central axis direction is the same as the length of the enlarged diameter cylindrical portion 43 in the central axis direction. .
In the flange portion 23, two fitting holes 23a that are vertically drilled toward the central axis are drilled at symmetrical positions.

  The peripheral surface of the tightening tool locking portion 2b has a polygonal shape having a two-surface width in which an existing tightening tool such as a spanner or a wrench or a dedicated tightening tool is locked.

The screw cylinder member 2 includes a cylindrical insertion guide portion 24 that extends from the tightening tool locking portion 2b side to the female screw portion 22.
The insertion guide portion 24 has an inner diameter that is substantially the same as or slightly larger than the outer diameter of the distal end portion of the branch pipe portion of the saddle type EF joint 7 described later, and its axial length is about 10 mm.

  The screw cylinder member 2 is fitted with the ring-shaped packing 25 at the end, and the male screw portion 21 is connected to the female screw portion 42 of the valve body pressing member 4 with the two-component mixed liquid adhesive applied to the male screw portion 21. Then, the locking portion of the tightening tool is locked to the tightening tool locking portion 2b and the male screw portion 21 is rotated around the central axis, so that the male screw portion 21 is screwed into the female screw portion 42 and is fitted. The part 2 a is fitted into the valve body pressing member 4. The two-component mixed liquid adhesive is fixed to the main body member 1 by being cured.

  In this fitted state, the fitting hole 43a and the fitting hole 23a coincide with each other, and a hole penetrating from the main body member 1 to the screw cylinder member 2 is formed by the fitting hole 43a and the fitting hole 23a. The spring pin 14 is press-fitted so as to straddle the fitting hole 43a and the fitting hole 23a, and the screw cylinder member 2 is prevented from rotating.

The ball valve A is used as follows to connect the saddle type EF joint 7 made of polyethylene to, for example, a water main pipe 8a.
(1) As shown in FIG. 3, the saddle portion 72 of the saddle type EF joint 7 is electrically fused to the main pipe 8a.
(2) As shown in FIG. 3, one end of the branch pipe 8c is connected to the branch pipe portion 73 of the saddle type EF joint 7 via the socket type EF joint 8b, and the other end of the branch pipe 8c is connected to a faucet (not shown). Or a cap (not shown).

(3) As shown in FIG. 3, the insertion guide portion 24 of the ball valve A faces the tip of the branch pipe portion 71 of the saddle type EF joint 7, and the internal thread portion 22 of the ball valve A is inclined by the insertion guide portion 24. The female screw portion 22 and the male screw portion 71a of the branch pipe portion 71 are screwed together while being guided so as not to become a problem.
(4) Although not shown, the operation handle 6 is operated to bring the ball valve body 5 into the water stop position, and the hole saw body 91 of the hole saw device 9 is connected to the male screw cylinder of the ball valve A as shown in FIG. The cap-shaped mounting portion 92 is threadedly engaged with the male threaded cylinder portion of the ball valve A while facing the inside of the ball valve A, and the hole saw device 9 is mounted on the ball valve A.

(5) As shown in FIG. 4, after operating the operation handle 6 to bring the ball valve body 5 into the open position, the hole saw body 91 is advanced to the main pipe 8a side through the water passage hole 51 of the ball valve body 5. Then, a through hole 81 is drilled in the wall surface of the main pipe 8a.
(6) After drilling the through hole 81, the hole saw body 91 is retracted to the male screw cylinder 31 together with the drilled piece (not shown), and then the operation handle 6 is operated to bring the ball valve body 5 to the water stop position. Put it in a state.
(7) Although not shown, the hole saw device 9 is removed from the ball valve A, and the seal plug 74 shown in FIG.

In this embodiment, the seal plug 74 is made of polyvinyl chloride, and has a male screw portion 74a at one end and a seal portion 74b at the other end, as shown in FIG.
The male screw portion 74a is adapted to be screwed into the female screw portion 71b of the branch pipe portion 71, and a receiving hole 74c into which a tool tip portion such as a screwdriver is fitted is formed, and an outer peripheral surface near one end surface is formed. A first O-ring fitting groove 74d is formed, and the first O-ring 74e is fitted into the first O-ring fitting groove 74d.
The outer diameter of the first O-ring 74e is substantially the same as or slightly larger than the inner diameter of the female thread portion 71b.
The seal portion 74b has a columnar shape extending in the main pipe direction in a state where the diameter is reduced stepwise from the end face of the male screw portion 74a, and is substantially the same as or slightly smaller in diameter than the inner diameter of the seal hole portion 71d.
Further, the seal portion 74b has a second O-ring fitting groove 74j in which one side wall 74f is flush with the end face of the male screw portion 74a. The second O-ring 74h is fitted in the second O-ring fitting groove 74j. Are combined.

(8) After operating the operation handle 6 to bring the ball valve body 5 to the open position, the seal plug 74 is inserted into the branch pipe portion 71 using a screwdriver, a dedicated tool or the like (not shown). As shown, a seal plug 74 is screwed into a female threaded portion 71b provided in the branch pipe portion 71 to a position where the branch pipe portion 73 of the branch pipe portion 71 is not blocked, and the distal end side of the branch pipe portion 71 is stopped. Water. That is, the fluid is prevented from leaking from the main pipe 8 a to the distal end side of the branch pipe portion 71.
(9) After the water stop is completed, the ball valve A is removed, and a cap 75 is attached to the tip of the branch pipe portion 71 as shown in FIG.

That is, the main pipe 8a can be constructed on the side of the branch pipe 8c with the above-described method in an uninterrupted state.
Further, as shown in FIG. 7, the saddle type EF joint 7 attached to the main pipe 8a in this way has a seal hole provided at the end of the branch cylinder portion 71 on the side of the saddle portion 72 by removing the cap 75. The seal plug 74 is further screwed into the main pipe 8a side by using a screwdriver or a special tool until the seal portion 74b is fitted into 71d and the water stop is completed. Exchange work of the faucet connected to 8c and branch pipe 8c itself can be performed.

As described above, the ball valve A is screwed diagonally because the female screw portion 22 is formed of a thermoplastic resin such as polyethylene or polyvinyl chloride on the male screw cylinder portion 71a of the saddle type EF joint 7. However, there is little possibility of crushing the screw thread of the external thread part 71a. Therefore, it is possible to re-screw.
Further, since the fitting portion 2a including the female screw portion 22 is accommodated in the female screw portion 42 made of a metal material, even if the female screw portion 22 portion is formed of a thermoplastic resin, it is formed of only a metal material. With almost the same strength as the ball valve between the valve surfaces, which is almost the same as a ball valve made of only metal material,
In addition, the insertion guide portion 24 is provided. First, the insertion guide portion 24 guides the male screw portion 71a so that the central axis of the male screw portion 71a and the central axis of the female screw portion 22 coincide with each other. It is possible to prevent the screwing in at an angle as much as possible.

The present invention is not limited to the above embodiment. For example, in the above embodiment, there are two spring pins, but one or three or more spring pins may be used.
In the above embodiment, the insertion guide portion is provided integrally with the screw cylinder member. However, the insertion guide portion need not be made of synthetic resin, and may be provided on the main body member side.
In the above embodiment, an electrofusion type was used as the saddle type branch joint, but the saddle type branch joint may be fixed with an adhesive if the saddle part can be firmly bonded to the main pipe. I do not care.

A Ball valve 1 Body member 14 Spring pin 2 Screw cylinder member 21 Male thread part 22 Female thread part 23 Flange part 23a Fitting hole 24 Insertion guide part 3 Valve element housing member 4 Valve element holding member 42 Female thread part (screw cylinder member fitting part) )
43 Expanded tube (screw tube member fitting)
43a Fitting hole 5 Ball valve body 7 Saddle-type EF joint (saddle-type branch joint)
71 Branch pipe part 71a Male thread cylinder part 8a Main pipe 8b Socket type EF joint 8c Branch pipe

Claims (4)

A ball valve used for branch connection of an active pipe to a main pipe of a saddle-type branch joint having a female thread portion screwed into a male thread cylinder portion provided at a tip of a branch pipe portion of a saddle-type branch joint made of synthetic resin,
A screw tube member made of synthetic resin having the female screw portion, and a metal main body member having a screw tube member fitting portion into which at least the female screw portion of the screw tube member is fitted. Ball valve.   2. The ball valve according to claim 1, wherein an insertion guide portion having an inner diameter substantially equal to or slightly larger than an outer diameter of the male screw cylinder portion screwed into the female screw portion is provided at an insertion side end portion of the male screw cylinder portion.   The ball valve according to claim 2, wherein the insertion guide portion is integrally formed with the screw cylinder member.   The ball valve according to any one of claims 1 to 3, wherein the screw cylinder member is screwed to the main body member, and the spring pin is elastically fitted to a hole penetrating from the main body member to the screw cylinder member.

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