JP2000329256A - Water stop cock with check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a water pressure test from the outflow side as it is by providing an opening/closing member for opening or closing a bypass passage connecting the inflow side and outflow side of a check valve to detour the check valve. SOLUTION: This water stop cock 1 is installed on a pipe together with a meter, and water pressure is applied from the outflow side for a water pressure test after the installation work is completed. A ball 9 is set to a water passing state in this case, and a needle 45 is rotated to open a branch passage 41. Water flows into a valve chamber 7 from an expansion pipe 19 via a communication passage 23, a large-diameter section 18b, a communication passage 39 and a branch passage 41 and flows to the primary side through a second passage 9b and a passage 9a of the ball 9. A passage connecting the primary side and the secondary side by detouring a check valve 25 is completed, and water pressure can be applied from the secondary side (outflow side) for the water pressure test.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopcock with a check valve used for water supply, and more particularly, to a water stopcock with a check valve which is capable of performing a water pressure test by applying water pressure from a secondary side. About.

[0002]

2. Description of the Related Art Some water stopcocks used for water supply are provided with a check valve for preventing backflow from a secondary side. By the way, after installing a meter, a water stopcock, and the like in a pipe, it is usual to perform a water pressure test by applying a water pressure to check that there is no leak in the pipe portion.

[0003] In this case, there is no problem in applying the water pressure from the primary side, but depending on the business entity, the test may be performed by applying the water pressure from the secondary side. When water pressure is applied from the secondary side with a water stopcock with a check valve, the check valve closes and the water pressure test cannot be performed. Therefore, in this case, the check valve is removed during the hydraulic pressure test, and the check valve is attached after the test. Therefore, the operation becomes complicated, and it takes a long time to complete the installation operation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to perform a water pressure test by applying water pressure from a secondary side with a check valve attached. It is an object of the present invention to provide a water stopcock with a check valve.

[0005]

In order to solve the above-mentioned problems, a water stopcock with a check valve according to the present invention bypasses the check valve and connects the primary side and the secondary side of the check valve. A bypass passage to be connected and an opening / closing member for opening and closing the bypass passage are provided.

In one embodiment, a water drainage mechanism is provided in the water stopcock, and the primary side and the secondary side of the check valve are connected with a part of the flow path from the secondary side to the water drainage stopcock. The configuration is such that a part of the bypass flow path is defined.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited to the embodiments described below.

FIG. 1 is a longitudinal sectional view showing a water stopcock (hereinafter simply referred to as a water stopcock) 1 with a check valve according to a first embodiment of the present invention. The water stopcock is a ball water stopcock and a water drainage ball water stopcock with a check valve, which also has a water drainage mechanism.

Reference numeral 3 denotes a stopper main body of the water stopcock 1, which defines a valve chamber 7 together with the ball retainer 5. The ball retainer 5 has an inlet 5 a connected to the primary side pipe and communicating with the valve chamber 7. In the valve chamber 7, a ball 9 as a valve body for switching the cutoff water is supported by a ball seat 11 and rotatably received. The ball 9 has a flow path 9a formed therein.
By rotating via a spindle 15 inserted from above into a spindle housing 13 provided above the valve chamber 7, the water stoppage of the water stopcock 1 is switched between the water-stop state and the water-stop state. Since this configuration is well known, detailed description is omitted. The ball 9 further has a side flow passage 9b extending in a direction orthogonal to the flow passage 9a and having one end connected to the flow passage 9a and the other end connected to a space 7a around the ball 9 in the valve chamber. However, this will be described later.

The plug body 3 is provided with a secondary connecting portion 17 on the side opposite to the ball holder 5 with the valve chamber 7 interposed therebetween. The connecting portion 17 has an outlet 18 communicating with the valve chamber 7. Is formed. The outlet 18 is formed in two stages, and includes a large-diameter portion 18a having a large inner diameter at an end near the secondary side and a small-diameter portion 18b having a small inner diameter near the primary side. A telescopic pipe 19 is attached to the large-diameter portion 18a so that the rear end 19a is slidably inserted therein so as to be telescopic.
Since the configuration and function of the telescopic pipe 19 are well known, a detailed description thereof will be omitted.

Reference numeral 21 denotes an adapter for mounting a cartridge type check valve 25 described later. A male screw is provided on the outer periphery of a front end 21a of the adapter, and the male screw is provided on a rear end 19a of the telescopic pipe 19. , So as to move integrally with the telescopic pipe 19. The rear end 21 b of the adapter 21 is slidably fitted in the small diameter portion 18 b of the outlet 18. A part of the male screw on the outer periphery of the front end portion 21 a of the adapter 21 is partially cut in a plane, and between the inner periphery of the extendable pipe 19 and the inside of the extendable pipe 19 and the outlet 18. A communication path 23 for communicating with a space around the adapter 21 in the large diameter portion 18a is defined.

Reference numeral 25 denotes a cartridge type check valve, in which a valve body 25b is movably housed in a non-closed casing 25a. A male screw is formed on the outer periphery of the left end of the casing 25a in the figure, and the male screw is screwed to a female screw provided on the inner periphery of the front end 21a of the adapter 21 to be attached to the adapter 21. The state shown in the figure is a water-flowing state, and when the flow of water stops, the valve body 25b closes the opening at the left end of the casing 25a and prevents the backflow of water from the secondary side to the primary side. I have.

A hole extending downward from the upper end of the spindle 15 is formed, and a small-diameter vertical flow path 27 at the lowermost side and a larger-diameter valve chamber 29 thereon are formed.
It is connected to an upper spindle 33 fixed to the handle 31 and is closed. The spindle 15 further has a lateral hole 35 communicating at one end with the vertical flow path 27 and at the other end with a circumferential flow path 33 formed between the spindle 15 and the inner periphery of the spindle housing 13. ing.
In the valve chamber 29, a check ball 36 large enough to close the upper end of the vertical flow path 27 is housed. Further, the spindle 15 is formed with a drain hole 37 penetrating the peripheral wall and having one end communicating with the internal valve chamber 29. When the spindle 15 is rotated clockwise from the illustrated position by about 90 degrees as viewed from above, a drain port (not shown) provided on the peripheral wall of the spindle housing portion 13 of the plug body 3 is formed. , And communicate with each other.

The plug body 3 is provided with a connecting passage 39 for communicating the inside of the large diameter portion 18a of the outlet 18 with the circumferential passage 33 formed below the spindle housing 13. ing. In the middle of the connection flow path 39, there is provided a branch flow path 41 which extends obliquely downward and communicates with the valve chamber 7 in which the ball 9 is stored. The upper end of the branch channel 41 is normally closed by a needle 43 screwed and attached to a screw hole 43 formed concentrically with the branch channel 41. Since the width of the connecting flow path 39 in the direction perpendicular to the plane of the drawing is larger than the diameter of the needle 43, the presence of the needle 43 causes the circumferential flow path 33 to flow.
There is no interruption of communication between the motor and the large diameter portion 18a.
Although not described one by one, an appropriate seal member such as an O-ring is disposed at a necessary portion as shown in the figure, and sealing is performed between the members.

In the drainage ball stopcock 1 with a check valve having the above-described structure, the state shown in the drawing is a water-passing state in which the faucet on the secondary side is opened and water flows. When the secondary side is closed, the valve body 25b of the cartridge-type check valve 25 closes the opening of the casing 25a to prevent backflow.

In order to stop the water to prevent freezing and to drain the water, the ball is rotated about 90 degrees clockwise through the spindle 15 by operating the handle 31 as described above. Drain hole 37 is aligned with a drain hole (not shown) formed in the peripheral wall of the spindle housing portion 13. The water on the secondary side passes from the telescopic pipe 19 to the periphery of the cartridge type check valve 25, and passes through the communication path 23 formed between the adapter 21 and the telescopic pipe 19, and the large-diameter portion 1.
8a. Then, it passes through the connection flow path 39, passes through the circumferential flow path 33 and the horizontal hole 35, and enters the vertical hole 35. Then, the check ball 36 is further pushed up into the valve chamber 29, and is drained to the outside of the water stopcock 1 through a discharge hole 37 (not shown) through a discharge hole 37. At this time, the check valve 25 is closed, and the branch flow path 41 is also closed by the needle 45, so that no water flows to the primary side.

When the water stopcock 1 is installed in a pipe together with a meter or the like, and a water pressure test is performed by applying water pressure from the downstream side after the installation work, the ball 9 is brought into the illustrated water-passing state. . Then, by rotating the needle 45, the branch flow path 4
Open 1. Thereby, the communication path 2 is extended from the telescopic pipe 19.
3, through the large-diameter portion 18b, the connecting flow path 39, and the branch flow path 41, into the valve chamber 7, and further through the second flow path 9b and the flow path 9a of the ball 9 to the primary side. As described above, the flow path connecting the primary side and the secondary side is completed by bypassing the check valve 25, so that a water pressure test can be performed by applying water pressure from the secondary side. If this flow path is not formed, the check valve 25 will be closed by the water pressure from the secondary side, and no water pressure will be applied to the primary side, so that a water pressure test cannot be performed. When the water pressure test is performed, since the ball 9 is in the illustrated water-passing state, the drain hole 37 of the spindle 15 is out of alignment with the drain port of the spindle housing portion 13, and the ball 9 is drained from here. Never.

FIG. 2 shows a water stopcock 1 according to a second embodiment.
It is sectional drawing of No. 01. This stopcock is of the type commonly referred to as the instep stopcock. The plug body 103 has a partition wall 104 inside.
, And is divided into a primary room 105 and a secondary room 106. The spindle 107 is inserted from above the stopper body 103. From the lower end of the spindle 107 to the valve
7a is formed, and the valve piece 108 is attached here.
The valve body 108 includes a valve body 109, and the valve body 109
Has a shaft portion 109a slidably inserted into the valve piece mounting hole 107a, a flange 109b extending outward at a lower end of the shaft portion 109a, and a screw portion 109c extending downward from the flange 109b. A packing 110 is attached to the lower surface side of the flange 109b using a nut 111 screwed into the screw portion 109c. Code 10
4a is an opening formed in the partition wall 104 so as to be centered on the axis of the spindle 107, and 104b is a valve seat formed around the opening 104a on the secondary chamber side.

The state shown in the figure is a water-flowing state,
Is moving upward due to water pressure. When the secondary side is closed, the valve piece 108 falls downward, sits on the valve seat 104b, closes the opening 104a, and prevents backflow from the secondary side to the primary side. When stopping water, the spindle 107 is rotated and moved downward, and the spindle 10 is rotated.
7, the valve piece 108 is pressed against the valve seat 104b.

Reference numeral 113 denotes a bypass flow path connecting the primary chamber 105 and the secondary chamber 106 separately from the opening 104a, and a needle 115 is disposed in the middle of the bypass flow path. By providing the bypass channel 113 and the needle 115, a water pressure test can be performed by applying water pressure from the secondary side. That is, in a conventional water stopcock of this type not provided with this configuration, when water pressure is applied from the secondary side in the water stoppage state as well as in the water stoppage state, the valve piece 108 sits on the valve seat 104b and the opening 104a The test cannot be performed because the test is closed. In the water stopcock 101 of the present embodiment,
Open the bypass channel 113 by operating the needle 115,
Since the primary chamber 105 and the secondary chamber 106 can be communicated, a water pressure test from the secondary side can be performed.

[0021]

As described above in detail, according to the present invention, in a water stopcock with a check valve, a bypass passage bypassing the check valve and communicating between the primary side and the secondary side is provided. Since the opening and closing member for opening and closing the flow path is provided, after installing the stopcock, the water pressure test from the secondary side can be performed as it is, and the check valve is removed during the water pressure test as in the related art. In addition, work such as mounting after the test is completed becomes unnecessary, and the work efficiency of installation and test is greatly improved.

In the construction of the drain plug, a check mechanism for the drain plug is provided by using a spindle for rotating the ball. The installation space is much smaller than when the device is installed in a location.

In this case, since the bypass flow path is branched from the connection flow path for draining water, the configuration becomes simpler and the manufacturing cost can be reduced as compared with the case where the bypass flow path is made independent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water stopcock according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a water stopcock according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopcock 3 Stopper body 7 Valve room 9 Ball 15 Spindle 18a Large diameter part 23 Communication part 25 Check valve 39 Connection flow path 41 Branch flow path

Claims (8)

[Claims] 1. A stopcock provided with a check valve for preventing a backflow from a secondary side to a primary side, wherein the check valve is bypassed and the primary side and the secondary side of the check valve are connected. A water stopcock with a check valve, comprising: a bypass passage that opens; and an opening / closing member that opens and closes the bypass passage. 2. The stopcock with a check valve according to claim 1, wherein the stopcock is a ball stopcock using a ball,
The stopcock with a check valve, wherein the bypass passage bypasses the check valve, and one end thereof communicates with a space in the valve chamber in which the ball is stored. 3. The water stopcock with a check valve according to claim 2, wherein the ball has a water flow passage formed therethrough and one end connected to the water flow passage. A stopcock with a check valve, characterized in that the end is provided with a second flow passage leading to a space in the valve chamber. 4. The stopcock with a check valve according to claim 1, wherein the stopcock is a ball stopcock including a ball and a spindle for rotating the ball. Is rotatably housed in a spindle housing portion of the stopper body, and at a predetermined position in the axial direction of the spindle,
An annular cavity is defined between the outer periphery of the spindle and the inner periphery of the spindle housing portion, and the spindle is formed with a vertical flow path formed therein, and above the vertical flow path, A valve chamber containing a check ball capable of closing the upper end of the vertical hole, a horizontal hole communicating with the vertical flow path and the annular space, and a through hole having one end communicating with the valve chamber; When the spindle rotates by a predetermined angle, a drain hole is formed which is aligned with and communicates with a drain port formed in the spindle housing portion, and the water stopcock communicates the annular space with the secondary side of the ball. A water stopcock with a check valve, characterized in that the water stopcock is provided with a connecting flow path. 5. The stopcock with a check valve according to claim 4, wherein the check valve is disposed downstream of the ball, and the connection flow path is a secondary valve downstream of the check valve. A water stopcock with a check valve, characterized in that it is in communication with the side. 6. The stopcock with a check valve according to claim 5, wherein the bypass passage is defined by branching off from the connection passage in the middle of the connection passage. ,
Stopcock with check valve. 7. The stopcock with a check valve according to claim 6, wherein said bypass passage bypasses said check valve, and one end thereof communicates with a space in a valve chamber in which said ball is stored. A water stopcock with a check valve. 8. The water stopcock with a check valve according to claim 7, wherein the ball has a water flow passage formed therethrough and one end connected to the water flow passage. A stopcock with a check valve, characterized in that the end is provided with a second flow passage leading to a space in the valve chamber.