JP4326551B2 - Check valve - Google Patents

Description

  The present invention relates to the structure of a check valve used in a water supply system.

In a water supply system, for example, in a public water pipe network, main valve operation, main pipe rupture, large pressure fluctuations (extension of pumps, emergency water intake from fire hydrants, etc. cause extreme water demand in part of the piping system. Tap water may flow backward when the pressure drop occurs. This reverse flow may cause the tap water once discharged to be sucked into the water pipe. The check valve is installed in the tap water flow path to prevent such a phenomenon.
Conventionally, various check valves for preventing a back flow of fluid have been used, but most of them are configured to be inserted in the middle of a water pipe and attached at an appropriate position. For example, the check valve includes a housing including a valve body and a spring that biases the valve body, and the spring is disposed in the flow path (see Patent Document 1).
JP 59-37375 A

In the water supply system, various kinds of dust exist in the pipe immediately after the pipe construction, and when the pipe is washed, the dust adheres to the check valve and causes various troubles. Such dust is particularly entangled with the spring of the check valve disposed in the flow path, increasing the obstacle and causing deterioration of the check valve function.
In addition, the function of the check valve is deteriorated due to adhesion of scale due to aging. Therefore, it is sometimes necessary to replace parts and prevent their functional deterioration. Conventionally, the valve body must be removed from the water pipe and replaced with the valve body, which is very difficult.
The present invention has been made under such circumstances, and a spring and a water stop piece are respectively arranged on the outside of the seat to ensure a wide gap so that dust does not easily get entangled, and the spring is isolated from the flow path. In addition, it provides a check valve that does not hinder the spring function and reduces the check function, and prevents deterioration of the check function due to dust adhering to pipe cleaning and initial water flow. In order to improve the workability, a check valve that releases the valve function is provided , and a check valve that simplifies maintenance of the check function is provided by making the entire valve function easily replaceable. .

The check valve of the present invention has a water inlet provided on the primary side and a water outlet provided on the secondary side, has a flow path between the water inlet and the water outlet, and has a separate opening. A valve body, a water stop piece disposed in the valve body and blocking the flow path, a shaft disposed in the valve body and sliding up and down the water stop piece, and the separate valve body. A sheet that is fixed to the opening and has a sheet surface that contacts the sheet portion of the water stop piece, and that guides the sliding of the shaft; and a spring provided on the side of the other opening of the shaft. The water-stopping piece is pushed down by dynamic water pressure when water is passed, so that the sheet portion of the water-stopping piece can be separated from the seat surface of the sheet and water can flow, and a negative flow or the like is caused on the primary side. When the water stops, the water stop piece is pulled up by the spring. The sheet portion of the water blocking piece abuts against the sheet surface of the sheet, and can prevent backflow from the secondary side to the primary side, and the water blocking piece having the spring and the sheet portion is respectively connected to the shaft. Is located outside the longitudinal direction of the seat central axis that guides the sliding of the sheet, and is disposed on the outlet side of the flow path, the spring is installed separately from the flow path , the valve body includes the separate opening and The lid has a lid for sealing the other opening, the lid has a lid opening on the outside in the longitudinal direction of the lid central axis, and a valve function release lid and a valve function release stem for sealing the lid opening. The valve function release lid includes a large diameter portion having an opening at one end and a small diameter portion formed at the other end of the large diameter portion and in contact with the shaft via the valve function release stem. The large diameter portion fits the lid opening of the lid. Alternatively, when the small diameter portion is fitted or screwed into the lid opening portion of the lid, the small diameter portion pushes down the shaft to release the valve function, and reverses the present invention. The stop valve constitutes an integral cartridge by the seat, the water stop piece, the shaft and the spring holding the shaft, and the cartridge is inserted into the valve body from the separate opening of the valve body, It is characterized by being arranged .

In the present invention , since the spring and the water stop piece are arranged on the outside of the seat to secure a wide gap, dust is not easily entangled, and further, the spring function is not hindered as a result of being installed separately from the flow path. The check valve with little deterioration of the check function can be obtained by releasing the check valve function immediately after piping construction, thereby preventing the check valve function from being deteriorated due to dust adhering to pipe cleaning and initial water flow. By improving workability such as pipe cleaning and initial water flow, and easily replacing the entire check valve function, the check valve function due to adhesion of impurities can be easily maintained with little secular change.

  Hereinafter, embodiments of the present invention will be described in detail with reference to examples.

First, Embodiment 1 will be described with reference to FIGS.
FIG. 1 is a front sectional view of the check valve of this embodiment, FIG. 2 is a front sectional view for explaining the water flow state of the check valve of this embodiment, and FIG. 3 is a view of the check valve of this embodiment. It is front sectional drawing explaining a non-return state.

  The check valve 25 has a water inlet 20 provided on the primary side and a water outlet 21 provided on the secondary side, and a flow path indicated by an arrow (see FIG. 2) between the water inlet 20 and the water outlet 21 (see FIG. 2). A valve body 3 having a water flow). In addition to the water inlet 20 and the water outlet 21, the valve body 3 has another opening 23 (see FIG. 6) which is a third port at the upper part between the two ports. In the valve main body 3, a water stop piece 17 that blocks the flow path, a shaft 18 that slides on the water stop piece 17, and another opening 23 of the valve main body 3 are inserted and arranged so that the water stop piece 17 contacts. A seat 14 having a seat surface 14s and guiding the sliding of the shaft 18 and a spring 13 provided on the side of the other opening of the shaft 18 are disposed. When the water stop piece 17 comes into contact with the sheet 14 and enters a water stop state, the top packing 16 attached to the upper surface of the water stop piece 17 is brought into contact with the convex portion at the tip of the sheet 14. The contact portion of the sheet 14 tip convex portion is referred to as a sheet surface 14s, and the contact portion of the top packing 16 is referred to as a sheet portion.

  When the water-stopping piece 17 passes through, the sheet portion of the piece packing 16 provided on the water-stopping piece 17 is moved away from the sheet surface 14 s at the tip end of the sheet 14 by dynamic water pressure. Further, when a reverse flow factor such as a negative pressure occurs on the primary side, the water stop piece 17 is attracted to the sheet surface 14 s by the holding force of the spring 13, and the water stop piece 17 is moved to the sheet surface 14 s at the front end of the sheet 14. The sheet portion of the top packing 16 provided on the side abuts to prevent backflow from the secondary side to the primary side. Since the spring is installed on the side of the separate opening 23, it is isolated from the flow path formed between the water inlet 20 and the water outlet 21. Further, the water stop piece 17 is disposed outside the sheet 14 in the longitudinal direction of the central axis.

  The seat 14 is inserted and arranged in the valve body 3 through the separate opening 23, and the portion in contact with the inner surface 19 of the flow path cylinder is stopped by the O-ring packing 15. The space between the other opening 23 side of the sheet 14 and the water stop piece 17 side is constituted by three supports. The check valve 25 has a lid 11 provided with a valve function release lid 4. The valve body 3 has a separate opening 23 in the middle of the water inlet 20 and the water outlet 21, and this separate opening 23 is sealed by the lid 11. An O-ring packing 12 is interposed between the separate opening 23 and the lid 11 to bring them into close contact.

Next, the operation of the check valve according to the first embodiment will be described with reference to FIGS.
1 is connected to a water pipe or the like. When water is passed through the water inlet 20, the water pushes the water stop piece 17 along the flow path and flows out from the water outlet 21 along the flow path. At this time, the water stop piece 17 is separated from the seat 14 by dynamic water pressure against the holding force of the spring 13 (FIG. 2).
Next, a state where the check function is activated will be described (FIG. 3). When a reverse flow factor such as negative pressure occurs on the primary side, the water stop piece 17 is drawn toward the sheet surface 14s by the holding force of the spring 13, and the water stop piece 17 is provided on the sheet surface 14s at the front end of the sheet 14. The sheet portion of the frame packing 16 thus brought into contact prevents back flow from the secondary side to the primary side.
In this embodiment, the water stop piece is arranged on the outside of the seat to secure a wide gap, so that dust is difficult to get entangled, and as a result of the spring being isolated from the flow path, the check function is not hindered. A check valve with little deterioration in function can be obtained.

Next, Embodiment 2 will be described with reference to FIGS.
FIG. 4 is a front sectional view for explaining the release of the check function of the check valve of this embodiment, and FIG. 5 is a perspective view for explaining the release method of the check function of this embodiment.
As shown in FIG. 5A, the valve function release lid 4 includes a large diameter portion 42 having an opening at one end and a small diameter portion 41 formed at the other end of the large diameter portion 42. The large-diameter portion 42 can be fitted or screwed (in this embodiment, screwed), and the opening of the lid 11 can be sealed. The small-diameter portion 41 can seal the lid 11 by being inserted into the opening of the lid 11 (threaded and screwed).

  For example, after the check function is canceled immediately after the pipe construction, pipe cleaning, initial water flow, etc. (including pressure resistance inspection by secondary side water supply) are performed. At that time, by releasing the check function, it is possible to prevent the check function from being lowered due to the adhering of dust, etc., and to improve the workability of pipe cleaning and initial water flow (including pressure resistance test by secondary side water supply). Can do. As shown in FIG. 1, when the lid 11 is sealed with the large-diameter portion 42 of the valve function release lid 4, this check valve has a check function, and the valve function is released as shown in FIG. When the lid 11 is sealed by the small diameter portion 41 of the lid 4, the check function is released. As shown in FIG. 5A, after removing the valve function release lid 4 from the lid 11, the small-diameter portion 41 of the valve function release lid 4 is inserted into the opening of the lid 11 (threaded and screwed).

Thus, when the small diameter portion 41 of the valve function release lid 4 is inserted into the opening of the lid 11, the valve function release stem 7 is pushed by being pushed by the small diameter portion 41 inserted therein. The pressed valve function release stem 7 pushes the shaft 18 to release the water stop piece 17 from the seat 14 and open the flow path.
At this time, when the small-diameter portion 41 of the valve mechanism release lid 4 is inserted into the opening of the lid 11, the non-return function can be released when the screw is screwed and screwed. The workability such as initial water flow that needs to be improved.
In this embodiment, by canceling the check function immediately after the construction of the pipe, it is possible to prevent the check function from being deteriorated due to adhesion of dust etc. in pipe cleaning and initial water flow (including pressure resistance test by secondary side water supply). , Workability such as pipe cleaning and initial water flow (including pressure test by secondary side water supply) is improved.

Next, Example 3 will be described with reference to FIG.
FIG. 6 is a perspective view for explaining the cartridge replacement method of this embodiment. In this embodiment, the cartridge is composed mainly of the sheet 14, the water stop piece 17, the shaft 18 and the spring 13 for holding the shaft 18.
In order to replace the cartridge with a new one, first, the hexagonal portion 22 of the lid 11 is sandwiched with a tool and the lid 11 is loosened. When the lid 11 is removed from the other opening 23 of the valve body 3, the old cartridge integrated with the lid 11 can be extracted from the valve body 3 through the support ring 8. After the extraction, the support ring 8 is removed, and the old cartridge is removed from the lid 11 (FIG. 6A). Thereafter, a new cartridge is attached to the lid 11 using the support ring 8, and the lid 11 and the new cartridge are integrated. A new cartridge integrated with the lid 11 is inserted into another opening 23 of the valve body 3, the hexagonal portion 22 is sandwiched with a tool, and the lid 11 is tightened and attached (FIG. 6B).
In this embodiment, it is possible to easily maintain the check function by making the entire valve function into a cartridge that can be replaced.
In order to replace the cartridge in a different embodiment (not shown) in which the lid 11 and the cartridge are not integrated, first, the hexagonal portion 22 of the lid 11 is clamped with a tool and the lid 11 is loosened. The lid 11 is removed from the other opening 23 of the valve body 3, the support ring 8 is removed, and finally the old cartridge is removed. Thereafter, a new cartridge, the support ring 8 and the lid 11 are inserted into the valve body 3 in this order from the separate opening 23, the hexagonal portion 22 is sandwiched with a tool, and the lid 11 is tightened and attached.

Next, the water flow / backflow prevention operation of the check valve of the present invention will be described with reference to FIG. FIG. 7 is a layout view of a water system in which the check valve of the present invention is arranged.
In the water system, a meter M and a stop cock 24 are disposed on the water main P side (primary side) from the check valve 25. That is, the stop cock 24, the meter M, and the check valve 25 are arrange | positioned in order from the primary side in the ground. At the time of water flow, the water stop piece 17 shown in FIG. 1 is pushed by the water pressure (water flow) on the primary side from the check valve 25 to enter a water flow state. And the primary side tap water is supplied from the check valve 25 to the faucet 26 side (secondary side). When a reverse flow factor such as negative pressure occurs on the water main P side (primary side), the water stop piece 17 is drawn toward the seat surface 14 s by the spring 13, and the water stop piece 17 is moved to the sheet at the tip of the sheet 14. It abuts against the surface 14s to prevent backflow from the secondary side to the primary side (see FIG. 3).

1 is a front sectional view of a check valve according to Embodiment 1. FIG. FIG. 3 is a front cross-sectional view illustrating a water flow state of the check valve according to the first embodiment. FIG. 3 is a front cross-sectional view illustrating a check state of the check valve according to the first embodiment. The front sectional view explaining cancellation of the check function of the check valve of Example 2. The perspective view explaining the cancellation | release method of the non-return function of Example 2. FIG. FIG. 9 is a perspective view illustrating a cartridge replacement method according to Embodiment 3. The layout of the water supply system which arranged the check valve of the present invention.

Explanation of symbols

3 ... Valve body 4 ... Valve function release lid 6, 13 ... Spring 7 ... Valve function release stem 8 ... Support ring 9, 10, 12, 15 ... O-ring packing 11. ··· Lid 14 ··· Seat 16 · · · Frame packing 17 · · · Water stop piece 18 · · · Shaft 19 · · · Cylinder inner surface 20 · · · Water inlet 21 · · · Water outlet 22 · · · Hexagon part 23 ... Separate opening part 24 ... Stop cock 25 ... Check valve 26 ... Faucet 41 ... Small diameter part of valve function release lid 42 ... Large diameter of valve function release lid Part 14s ... sheet surface

Claims (1)

A valve body having a water inlet provided on the primary side and a water outlet provided on the secondary side, having a flow path between the water inlet and the water outlet, and having another opening, and in the valve body Disposed in the valve body, a shaft disposed in the valve main body and sliding up and down the water stop piece, and fixed to the separate opening of the valve main body, The water top has a seat surface that contacts the seat, and includes a seat that guides the sliding of the shaft, and a spring provided on the side of the separate opening of the shaft, At that time, when the hydraulic pressure is pushed down and the sheet portion of the water stop piece is separated from the sheet surface of the sheet, water flow is possible, and when a reverse flow factor such as negative pressure occurs on the primary side, The water-stopping piece is pulled up by a spring and the seat The sheet portion of the water stop piece abuts on the seat surface to prevent backflow from the secondary side to the primary side, and the water stop piece having the spring and the sheet portion respectively guides the sliding of the shaft. The seat is disposed outside the longitudinal direction of the seat central axis and is disposed on the outlet side of the flow path , the spring is installed separately from the flow path , and the valve body includes the separate opening and the separate opening. The lid has a lid opening on the outside in the longitudinal direction of the lid central axis, and includes a valve function release lid and a valve function release stem for sealing the lid opening , The valve function release lid is formed of a large diameter portion having an opening at one end and a small diameter portion formed at the other end of the large diameter portion and connected to the shaft via the valve function release stem. Fitting or screwing the lid opening of the lid When the small diameter portion is fitted or screwed into the lid opening of the lid, the small diameter portion pushes down the shaft to release the valve function, and the seat, the water stop piece, the shaft And the spring holding the shaft constitutes an integral cartridge, and the cartridge is inserted into the valve body from the separate opening of the valve body and arranged .

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