JPH09229221A - Expansion water stop cock for meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion water stop cock for a meter, having no problem of leakage and good attaching workability, and for absorbing external force. SOLUTION: A water stop cock is constituted of first and second housings 2, 2' in which a valve main body is to be housed. The first housing 2 is axially extended into an approximately cylindrical shape, and the extended part is taken as a coupling main body 10. A coupling constituent body 20 composed of a fastening bush, a packing, and a plurality of balls is screwed to the coupling main body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopcock composed of first and second housings in which a valve body is housed, and a stretchable and flexible structure composed of a joint body and a joint structure. The present invention relates to a telescopic stopcock for connecting a pipe joint, and more particularly to a telescopic stopcock for a meter that is selected to be provided in a meter box.

[0002]

2. Description of the Related Art A water supply facility branching from a water distribution pipe is generally constructed as shown in FIG. That is, the water pipe W buried underground under the road R, the saddle dip D for branching and supplying water to the residential land, and the saddle dip D through the meter basin M of the residential land P are similarly buried underground. It is composed of a branch pipe K. The branch pipe K is
An S-shaped pipe S for adjusting the burial depth connected to the saddle tap D, a horizontal pipe H horizontally piped near the residential land P, a rising pipe T rising from the horizontal pipe H, It is composed of a second S-shaped pipe S ′ and the like that are piped up to a meter cell M that is shallowly provided. Various pipes such as the S-shaped pipe S, the horizontal pipe H, and the rising pipe T are expandable flexible pipe joints F and F as proposed by the present applicant in Japanese Utility Model Publication No. 3-49351. , ... are connected to each other.

Similarly, as shown in FIG. 4, in the meter box M, there is a well-known water shutoff valve or gate valve 50 and meter 5.
1 and are provided. The gate valve 50 is connected to the second S-shaped pipe S ′ via a socket 52, and the meter 51 is also connected to the water stopcock 50 via a socket 55. The pipe 57 in the residential land P is similarly connected via the meter socket 56 arranged in the meter box M. Therefore, the clean water in the water distribution pipe W is the saddle dip D, the S-shaped pipe S, the horizontal pipe H, the rising pipe T, the second S-shaped pipe S ′, the sluice valve 50, the meter 51, the pipe 57, etc. Water is distributed to a predetermined place in the residential area through the water. The amount of water to be distributed at this time can be appropriately known by opening the lid of the meter cell M and reading the meter 51, for example.

[0004]

As described above, since the sluice valve 50 is provided in the meter cell M, the sluice valve 50 closes the second S-shaped pipe S'and the socket 55 is closed. The meter 51 can be attached by tightening the cap nut of the meter socket 56, and the sockets 55 and 56 can be removed and replaced with a new meter 51 every predetermined period determined by the rule, for example, every seven years. It can also be used for the time being. However, it is recognized that the gate valve 50 or the socket 52 should be improved. For example, to connect the sluice valve 50 to the second S-tube S ′, the socket 52 is connected to the second S-tube S ′ by tightening one cap nut 53 of the socket 52, and Since the sluice valve 50 must be connected to the socket 52 by tightening the other cap nut 54, there is a problem of water leakage. That is,
There are many places to connect by tightening cap nuts 53 and 54,
The number of places where water leakage may occur is increasing. In addition, since the meter box M is provided in the residential land P, the space of the meter box M is generally small, but the work of tightening the cap nuts 53 and 54 and connecting the sluice valve 50 in this narrow space is time-consuming and difficult to construct. There is also the problem that it takes longer time. Further, since the sluice valve 50 is fixed to the S-shaped pipe S ′ by the rigid socket 52, when the external force acts from the S-shaped pipe S ′ or the pipe 57, the socket 52 and the sluice valve There is also a risk of damage to 50 and the like. Also,
The meter 51 can be replaced by loosening the cap nuts of the socket 55 and the meter socket 56.
Since 0 is fixed to the rigid socket 52, it is not possible to finely adjust the alignment when installing the meter 51.
There is also a problem that it takes time to install the work.

The present invention is intended to solve the above-mentioned conventional drawbacks or problems. Specifically, there is little problem of water leakage, installation workability is good, and external force is absorbed. The purpose is to provide a telescopic stopcock. Another object is to provide a telescopic stopcock for a meter that allows easy replacement of the meter.

[0006]

In order to achieve the above object, the present invention provides a water stopcock having at least first and second housings in which a valve body is housed, a joint body and a joint. An expandable stopcock for a meter, to which an expandable flexible pipe joint composed of a constituent is connected,
One of the first and second housings of the water shutoff plug has a first housing extending in the axial direction in a substantially cylindrical shape, and the extending portion serves as a joint body of the elastic flexible pipe joint. Is composed of. The invention according to claim 2 is the joint body according to claim 1, wherein the joint straight pipe portion, the taper pipe portion that is tapered in diameter from the joint straight pipe portion toward the end, and the taper pipe. A large diameter portion of the joint having a diameter substantially equal to the maximum diameter portion of the portion is formed with a screw into which the tightening bush of the joint structure is screwed, and the large diameter portion of the joint is formed with a screw. The joint structure according to Item 1 or 2 includes at least a tightening bush having a screw that is screwed into a screw of a large diameter portion of the joint of the joint body, and a packing that comes into close contact with the inner peripheral surface of the tapered pipe portion of the joint body during assembly. And a plurality of balls interposed between the tightening bush and the connected pipe, and a predetermined size is provided between the inner peripheral surface of the end portion of the tightening bush and the outer peripheral surface of the connected pipe. It is configured so that there is an annular gap in the height.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which an embodiment of the present invention is implemented by a ball-type water stopcock will be described. The ball-type water stopcock 1 according to the present embodiment includes a first housing 2 made of, for example, bronze, which is shown on the left side in FIG.
And a second housing 2 ', which is also made of bronze and is shown on the right side. As is well known in the art, balls 3 made of, for example, rust-free steel are provided in the inner spaces of the first and second housings 2 and 2 '.

A stem hole 4 is opened in a substantially central portion of the first housing 2 so as to reach a ball chamber having a substantially spherical shape in the vertical direction, and a stem 6 is inserted into the stem hole 4 via O-rings 5 and 5. Is rotatably provided. The tip of the stem 6 is fixed in a groove formed in the ball 3, and a handle 7 is attached to the upper end. Therefore, the ball 3 can be seated on the valve seat 8 by operating the handle to stop the clean water.

As shown in FIG. 2, the elastic flexible pipe joint 30 is composed of the joint body 10 and the joint structure 20 connected to the joint body 10. According to the form, the joint body 10 is formed integrally with the first housing 2. That is, the first housing 2 extends to the left in FIG. 1 in a substantially cylindrical shape for a predetermined length. The extended portion is the joint body 10. As shown in FIG. 1, the joint body 10 includes a joint straight pipe portion 11, a taper pipe portion 12 that is tapered from the joint straight pipe portion 11, and a maximum diameter of the taper pipe portion 12. And a large-diameter joint portion 13 having the same diameter as, and these are integrally formed by, for example, casting as described above. A female screw 14 is formed on the inner peripheral surface of the joint large diameter portion 13.

The joint structure 20 is disclosed in Japanese Utility Model Publication No. 3-49351 mentioned in the section of the prior art, and as shown in FIG. 1, an annular tightening bush 21 and a ring-shaped resin. Cover 24, frustoconical synthetic rubber packing 25, ball race 26, a plurality of balls 27, 27,
... and so on. The inner diameter of the tightening bush 21 is
It is larger than the outer diameter of the connected pipe 49 inserted and connected inside the joint structure 20 and the head portion 28 of the tightening bush 21.
There is an annular gap δ between the inner peripheral surface and the outer peripheral surface of the connected pipe 49. Therefore, the connected pipe 49 and the tightening bush 21 can relatively bend by the annular gap δ. As shown in FIG.
At, a tapered surface 22 whose diameter is expanded rightward is formed. The ball race 26 is fitted between the outer peripheral surface of the connected tube 49 and the tapered surface 22. The ball race 26 is composed of a bellows portion, a ball receiving portion, a seal ring portion and the like, which are not shown accurately in the drawing. As described above, since the ball race 26 has the bellows portion, the plurality of balls 27, 27, ...
It is possible to move axially to some extent between the outer peripheral surface of the connected pipe 49 and the tapered surface 22.

A male screw 23 is provided on the outer peripheral surface of the tightening bush 21.
Is formed, and the male screw 23 connects the connected pipe 49 to the water stopper 1
When it is connected to, the female screw 14 of the joint body 10 is screwed. The packing 25 has a through hole through which the pipe 49 to be connected is inserted at the center in the axial direction, but it has a truncated cone shape as a whole, and the tip end thereof has a taper whose diameter is reduced rightward. It is a surface 29. This tapered surface 29
However, when they are connected, they come into close contact with the inner peripheral surface of the tapered tube portion 12 of the joint body 10.

The first housing 2 has a tubular portion 9 extending rightward from the stem hole 4 in FIG. A female screw with which the male screw of the second housing 2'is screwed is formed on the inner peripheral surface of the tubular portion 9. The second housing 2'is substantially tubular as a whole from a first tubular portion 3'connected to the first housing 2 and a second tubular portion 4'to which a socket 40 described later is connected. Is formed to exhibit. The inside of the first tubular portion 3 ′ serves as a valve chamber that cooperates with the first housing 2 to accommodate the ball 3, and the female screw and the screw of the tubular portion 9 of the first housing 2 are screwed on the outer peripheral portion. A matching male screw 5'is formed. A male screw 6'is also formed on the outer peripheral portion of the second tubular portion 4 '.

The socket or expansion tube 40 connected to the second housing 2'and the first and second cap nuts 43 and 45 provided in the expansion tube 40 are made of non-rust steel according to the present embodiment. Has been done. The expansion tube 40 is shown in FIG.
As shown in Fig. 3, the groove has a tubular shape as a whole, but a groove into which the O-ring 41 is fitted is formed in the outer peripheral portion at the left end, and a flange that spreads radially outward and functions as a stopper at the right end portion. 42 is formed. First cap nut 43
A female screw 44 that is screwed into the male screw 6 ′ of the second housing 2 ′ is formed on the inner peripheral surface of, and a female screw 46 is also formed on the inner peripheral surface of the second cap nut 45. The expansion tube 40
The other reference numeral 47 for the packing is made of synthetic resin, and 48 is a ring.

Next, a method of using the above embodiment will be described. The ball 3 is put in the first housing 2 and the stem 6
Attach to the ball 3 and attach the handle 7 to the stem 6.
Is fixed. In addition, the male screw 5'of the second housing 2'is screwed into the female screw of the tubular portion 9 of the first housing 2,
The first and second housings 2, 2'are integrated. At this time, the first and second housings 2 and 2'are integrated by interposing an O-ring 7'at the joint portion. Second housing 2 '
The first cap nut 43 is screwed into the male screw 6'of FIG.

Further, for example, in a factory, a packing 25, a cover 24, and a ball race 26 holding a plurality of balls 27, 27, ... Are inserted in the joint body 10 of the first housing 1 in this order, and Tightening bush 21
The male screw 23 is screwed into the female screw 14 of the joint body 10 so that the tightening bush 21 does not fall off. In this way, temporary assembly at the factory reduces the number of assembly steps on site. The water stopcock 1 in the temporarily assembled state as described above is shown in FIG.

As shown in FIG. 3, a saddle diversion tap D and a residential land P of a water pipe W buried underground under a road R or the like.
Pipe the branch pipe K up to the meter cell M. The branch pipe K is provided with a slant pipe S for adjusting the burial depth, a horizontal pipe H that is horizontally piped, a rising pipe T that rises from the horizontal pipe H, and a water stop tap Z. Two horizontal pipes H ', a second oblique pipe S'which is relatively shallowly installed to the meter box M, and a plurality of corrugated pipes N, N which appropriately connect the elbows of these pipes. , And the like, and the connected pipe 49 faces the inside of the meter cell M. The corrugated pipes N, N, ... sandwich the pipe material with a mold having a valley such as a waveform or a pulse waveform, and oil in the sandwiched pipe material,
It is formed by a so-called bulging method, in which a liquid such as water or a pressure medium such as rubber is press-fitted to bulge the pipe wall in the valley portion.

At the site inside the meter box M, which is piped as described above, the tightening bush 2 is attached to the end of the connected pipe 49.
The ball race 26, the cover 24, and the packing 25 are inserted from the first side in this order to a predetermined depth. Then, the male screw 23 of the tightening bush 21 is replaced with the female screw 14 of the joint body 10.
Screw it in and tighten it fully. Then, the tightening bush 2
1 and the joint body 10 are integrated, and packing 25
The taper surface 29 of the above is in close contact with the inner peripheral surface of the taper tube portion 12 of the joint body 10. Further, the inner peripheral surface of the packing 25 and the outer peripheral surface of the connected pipe 49 also come into close contact with each other. This allows the connected pipe 49 to
The ball-type water stopcock 1 is connected in a watertight state.
The connected state is shown in FIGS. In addition, tighten the first and second cap nuts 43 and 45 to secure the socket 40.
The meter 51 is attached via. A pipe 62 in the residential area P is connected to the meter 51 by a meter union 60, a meter socket 61, and the like.

With the above, the mounting of the water stopcock 1 and the meter 51 is completed. When an external force in the direction of gravity acts on the branch pipe K, the wavy pipes N, N, ... Are arranged in the elbow portion and include vertical elements, so that they are absorbed by these vertical elements. The external force in the horizontal direction is now absorbed by the horizontal element.
When a horizontal force, for example, a compression direction force is applied between the connected pipe 49 and the water stopcock 1, the connected pipe 49 shown in FIG.
The tip end 49 ′ of the joint moves relative to the stepped portion 11 ′ of the joint body 10 until it comes into contact therewith. This movement absorbs the stress in the compression direction. On the other hand, when a force acts in the pulling direction, the balls 27, 27, ... Are tightened with the connected pipe 49 until they are caught between the tapered surface 22 of the tightening bush 21 and the outer peripheral surface of the connected pipe 49. A relative deviation occurs between the bush 21 and the attached bush 21. This shift absorbs the stress in the tensile direction. Since there is an annular gap δ between the inner peripheral surface of the head portion 28 of the tightening bush 21 and the outer peripheral surface of the connected pipe 49, the annular gap δ also absorbs bending. By these actions, the connected pipe 49 or the pipe 6
Even if an external force is applied from the direction 2, the attachment parts of the water stopcock 1, the meter 51, etc. will not be damaged.

When the meter 51 is replaced, the handle 7 of the water stopcock 1 is operated to seat the ball 3 on the valve seat 8 to stop the clean water. Then, the second cap nut 45 of the expansion tube 40 is loosened and moved to the left in FIGS. Further, the meter union 60, the meter socket 61, etc. are removed and the meter 51 is taken out. Then, a new meter 51 is attached in a known manner. At this time, the water stopper 1 is connected to the connected pipe 4
Since it is bent by the annular gap δ with respect to 9, the position of the telescopic tube 40 and the meter 51 can be easily aligned.

[0020]

As described above, according to the present invention, one of the first and second housings of the water stopcock is
Since it extends in a substantially cylindrical shape in the axial direction, and the extending portion serves as the joint body of the expandable flexible pipe joint, that is, the joint body is formed integrally with the first housing,
When installing a telescopic stopcock for a meter, the number of connection points is smaller than when connecting with a conventional socket. Therefore, according to the present invention, the risk of leakage of tap water is reduced, and the installation and installation time of the expansion and contraction water stopcock for the meter is short, and further, the expansion and contraction stopcock for the meter, the meter etc. Even if an external force acts on the piping system in the vicinity of, these will not be damaged, and various effects peculiar to the present invention can be obtained. According to another invention,
Since there is an annular gap of a predetermined size between the inner peripheral surface at the end of the tightening bush of the joint structure and the outer peripheral surface of the connected pipe, the external force in the bending direction is an expansion / contraction stopcock for a meter, a meter, etc. Even if it acts on the piping system in the vicinity of, the effect of being absorbed by this annular gap can be obtained. Furthermore, since the expansion / contraction water stopper for a meter bends with respect to the pipe to be connected only by the annular gap, it is possible to obtain an effect of facilitating the alignment when the meter is attached.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention separately.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a schematic diagram showing an embedded state of a water shutoff plug for a meter according to an embodiment of the present invention.

FIG. 4 is a schematic view showing a buried state of a conventional water stopcock.

[Explanation of symbols] 1 ball type water stop 2
First housing 3 Ball (valve body) 10
Joint body 11 Joint straight pipe section 12
Taper pipe part 13 Joint large diameter part 14
Female screw 20 Joint structure 21
Tightening bush 25 Packing 27
Ball 51 Meter δ Annular Gap M Meter Masu

Claims (3)

[Claims] 1. An expandable flexible pipe joint comprising a joint body and a joint structure is connected to at least a water stopcock having first and second housings in which a valve body is housed. In the telescopic water stopper for a meter, the first housing of the first and second housings of the water stopper extends in a substantially cylindrical shape in the axial direction. An extendable stopcock for a meter, wherein the existing portion is a joint body of the extendable flexible pipe joint. 2. The joint body according to claim 1, wherein the joint straight pipe portion, the taper pipe portion that is tapered in diameter from the joint straight pipe portion toward the end, and the maximum of the taper pipe portion. An expansion / contraction water faucet for a meter, comprising a joint large-diameter portion having a diameter substantially equal to that of the diameter portion, and a screw into which the tightening bush of the joint structure is screwed is formed in the joint large-diameter portion. 3. The joint structure according to claim 1 or 2,
At least a tightening bush having a screw that is screwed into a screw of the joint large diameter portion of the joint body, a packing that closely adheres to the inner peripheral surface of the tapered pipe portion of the joint body during assembly, the tightening bush and the connected pipe. An expansion / contraction stop for a meter having a plurality of balls interposed between the inner and outer peripheral surfaces of the connected pipe and the inner peripheral surface of the tightening bush. Water faucet.