JP2733638B2 - Check valve with pressure relief structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a check valve having a pressure relief structure.

[0002]

2. Description of the Related Art Some water supply pipes and hot water supply pipes connected to the inside of a faucet device or to the faucet device have a check valve provided in a flow path thereof. Some non-return valves have not only the original non-return flow preventing function but also an abnormal pressure increase on the secondary side of the non-return valve. This abnormal pressurization causes problems such as heavy operation of the operation handle of the water faucet device, water leakage and fatigue destruction of the water faucet device. The cause of the abnormal pressure increase is that the faucet device or the water supply pipe is heated by hot water or the outside air, and the cold water in the sealed state expands on the secondary side, or the sudden stop operation of the faucet device occurs. Some are caused by water hammer shock waves.

FIG. 3 is a sectional view showing a check valve having a conventional pressure relief structure described in Japanese Utility Model Laid-Open No. 55-34036. In this check valve, a tubular sliding valve seat body 2 is slidably housed in a flow path of a valve case 1 formed in a tubular shape. The check valve body 3 is incorporated, and the check valve body 3 is seated on the valve seat 2a. The valve case 1 has joint portions 1a and 1b for connection to a water supply pipe, a faucet device, and the like at both ends thereof, and an upper joint portion 1b in the figure is a secondary joint and a lower joint portion. Piping is performed so that 1a is the primary side. The sliding valve element 2 is pressed by a spring 4 from the primary side to the secondary side of the valve case 1. The check valve body 3 is pressed by a spring 5 in a direction opposite to the sliding valve seat body 2. The check valve thus configured has a check valve blocking effect by a combination of the sliding valve seat 2 and the valve body 3, and has a combination of the sliding valve seat 2 and the valve case 1. The pressure relief function at the time of secondary side pressure increase is exerted.

[0004]

This check valve has a secondary valve structure in which the sliding valve seat body 2 moves toward the primary side against the elastic repulsion of the spring 4 when the secondary side pressure is increased. The pressure on the side is increased by increasing the volume on the side. Therefore, in the conventional check valve, as the sliding valve seat body 2 moves toward the primary side, the elastic repulsive force of the compressed spring 4 gradually increases, and the amount of relaxation of the secondary side pressure rise is reduced. The problem described above, such as increasing the weight of the operation handle of the faucet device, could not be fundamentally solved because the size was gradually reduced.

According to the present invention, in order to fundamentally solve the problem, the secondary side is boosted on the secondary side, and the primary side
Pressure relief by increasing the volume on the secondary side while
It is another object of the present invention to provide a check valve having a pressure relief structure that does not raise the pressure on the secondary side to a set value or more when an abnormal pressure rise follows the initial stage .

[0006]

SUMMARY OF THE INVENTION The gist of a check valve having a pressure relief structure according to the present invention (hereinafter referred to as "the check valve of the present invention") is a slide slidably housed in a flow passage. The valve seat is pressed by the spring from the primary side to the secondary side, and the check valve seated on the valve seat provided on the sliding valve seat is pressed by the spring from the secondary side to the primary side. , With the check valve seated
When the sliding valve seat moves toward the primary side, the secondary side
A check valve provided with a relief valve seat provided on the check valve body, and a relief valve seated on the release valve seat is provided with a relief valve seat from the primary side to the secondary valve seat. is pressed by the spring toward the side, the pressing force of the spring for pressing the relief valve body, der after the sliding valve seat body with the boosting of the secondary side moves from the secondary side to the primary side connexion , Secondary and
The relief valve element is set so as to be separated from the relief valve seat when the differential pressure with the primary side reaches a set value .

[0007]

The operation of the check valve of the present invention will be described with reference to the embodiment shown in FIGS. As shown in FIG. 1, when the pressure on the secondary side 11c-2 of the flow path 11c decreases as the water is supplied, the check valve body 13 is pressed by the pressure on the primary side 11c-1 and opens, and the primary side 11c is opened. -1 and the secondary side 11c-2 are brought into a water-permeable state. Conversely, the check valve body 13 causes the flow path 1
When the pressure on the secondary side 11c-2 of 1c is equal to the pressure on the primary side 11c-1, the valve is closed by the pressing force of the spring 15 (not shown).

As shown in FIG. 2, the secondary side 11 of the flow path 11c is
When the pressure of c-2 rises, the sliding valve seat body 12
4 moves toward the primary side 11c-1 against the repulsive elastic force of the secondary side 4c, thereby increasing the volume of the secondary side 11c-2.
-2 alleviates the initial pressure rise. This first
When the pressure on the secondary side 11c-2 rises and reaches the set pressure value after the initial stage , the relief valve element 16 moves the secondary side 11c-
2, the valve 11 is opened by being pressed by the pressure of 2 and the primary side 11c-1 and the secondary side 11c-2 are brought into a water-permeable state.
The water of c-2 is discharged to the primary side 11c-1. Channel 11c
The secondary side 11c-2 is opened by opening the relief valve body 16.
It does not rise abnormally. With this release, the secondary side 11c
When the pressure of -2 decreases, the relief valve element 16
The valve is closed by a pressing force of 7 (not shown).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a check valve according to the present invention will be described with reference to the embodiments shown in FIGS. The improvement of the check valve of the present invention is that the check valve body 13 is provided with a relief valve seat 13a, and the relief valve body 16 seated on the relief valve seat 13a has a primary side 11c-.
1 is pressed toward the secondary side 11c-2 by the spring 17, and the pressing force of the spring 17 against the release valve body 16 is increased by the pressure on the secondary side 11c-2.
After moving from 1c-1 to the secondary side 11c-2 ,
When the secondary side 11c-2 reaches the set pressure, the relief valve body 16 is set so as to be separated from the relief valve seat 13a and open. Except for this improvement, it is substantially the same as the conventional check valve.

The tubular valve case 11 has a cylindrical sliding valve seat 12 slidably housed therein, and the sliding valve seat 12 causes the internal flow passage 11c to be on the primary side. 11c-
1 and a secondary side 11c-2. Valve case 1
1 has joint portions 11a and 11b for connection to a water supply pipe, a faucet device and the like at both ends.

The sliding valve seat body 12 has a seal ring 18 fitted around the outer periphery and a check valve body 13 incorporated therein, so that the check valve body 13 is seated on the valve seat 12a. ing. The sliding valve seat 12 is provided on the primary side 11 of the valve case 11.
It is pressed by the spring 14 from c-1 to the secondary side 11c-2. A guide ring 21 is inserted into the sliding valve seat body 12 at a secondary end thereof. The check valve body 13 is
The sliding valve seat body 12 is pressed by a spring 15 in the opposite direction. The check valve body 13 is provided with a through hole 13b,
A relief valve seat 13a is formed on the primary side of the through hole 13b.

The relief valve body 16 is inserted through the through hole 13b of the check valve body 13 from the primary side, and the relief valve seat 13 is provided.
a and is sealed with a packing 19. The relief valve body 16 is configured such that a spring seat 20 is fitted to a valve shaft portion 16a, and is guided by the guide ring 21 via the spring seat 20.

The spring 17 is disposed between the check valve 13 and the spring seat 20 so as to fit the valve stem 16a. The pressing force of the spring 17 is applied to the secondary side 11c of the flow path 11c.
-2, the secondary side 11c-2 and the primary side 11c-1
Is a set value (for example, ΔP = 7.5 kg / c)
m ² ), the relief valve 16 is opened (FIG. 2).
See). Therefore, when the pressure on the secondary side 11c-2 of the flow path 11c increases, the check valve of the present invention slides toward the primary side 11c-1 so that the sliding valve seat body 12 compresses the spring 14 first. Then, when the differential pressure ΔP reaches the set value, the relief valve body 16 opens to prevent the secondary side 11c-2 from increasing its pressure.

[0014]

As described above in detail, according to the present invention, the present invention check valve, the flow path
In the due to the boosting of the secondary side, the secondary side and the secondary side slides the sliding valve seat body until the pressure difference between the primary side reaches the set value
To alleviate the step-up of the initial stage, following the initial stage abnormal boost
There are relief valve when the differential pressure reaches the set value prevents boosting of opened secondary side. Therefore, the check valve of the present invention has an excellent effect that can fundamentally solve the problems such as the heavy operation of the operation handle of the faucet device which the conventional check valve has.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a check valve according to the present invention and showing a state where a check valve body is opened.

FIG. 2 is a cross-sectional view showing an embodiment of the check valve of the present invention and showing a state in which a relief valve element is opened.

FIG. 3 is a cross-sectional view showing a conventional check valve.

[Explanation of symbols]

11c ... Flow path 11c-1 ... Primary side 11c-2 ... Secondary side 12 ... Sliding valve seat 12a ... Valve seat 13 ... Check valve 13a ... Relief valve seat 14 ... Spring 15 ... Spring 16 ... Relief Valve 17
…Spring

Continuation of the front page (72) Inventor Reiji Seki 5-1-1 Koiehonmachi, Tokoname-shi, Aichi Prefecture Inax Corporation (56) References JP-A 2-50574 (JP, U) JP-A 62-91074 (JP, U) Japanese Utility Model 1-157286 (JP, U)

Claims (1)

(57) [Claims] 1. A sliding valve seat body slidably housed in a flow path is pressed by a spring from a primary side to a secondary side, and is seated on a valve seat provided on the sliding valve seat body. The stop valve is pressed by the spring from the secondary side to the primary side, and the check valve is seated.
When the sliding valve seat in the state moves toward the primary side,
In a check valve having a pressure relief structure configured to increase the volume on the secondary side , a relief valve seat is provided on the check valve body, and the relief valve body seated on the relief valve seat is provided on the primary side. It is pressed by a spring towards the secondary side from the pressing force of the spring for pressing the relief valve body, after the sliding valve seat body with the boosting of the secondary side moves from the secondary side to the primary side And secondary
A check valve provided with a pressure relief structure , wherein the relief valve element is set so as to be separated from the relief valve seat when the differential pressure between the side and the primary side reaches a set value .