JPH11325279A - Spring energized disc check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring energized type check valve capable of passing fluid from an inlet to an outlet during resting when the transportation of the fluid is stopped. SOLUTION: A valve body 6 energized by a coil spring 11 is arranged at the outlet 3 of an annular valve seat 5. A cylindrical sleeve 15 is provided integrally with the valve body 6. A through-hole 16 for communicating an inlet 1 with the outlet 3 is provided for a sleeve 15. The coil spring 11 has spring force enough to replace the valve body 6 to a position slightly apart from the annular valve seat 5 when fluid pressure at the inlet is equal to that at the exit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention allows a fluid to flow in a forward direction from an inlet to an outlet by means of a spring-biased valve body attached to a fluid pipe, but closes the reverse flow in the reverse direction. The present invention relates to a stop valve, and more particularly, to a spring-loaded disc check valve capable of allowing an inlet fluid to pass to an outlet when the fluid is stopped.

[0002]

2. Description of the Related Art An example of a spring-loaded disk check valve is disclosed in Japanese Utility Model Publication No. 49-36740. In this method, an annular valve seat is provided in a valve casing having an inlet and an outlet, a disc-shaped valve body is arranged on the outlet side of the annular valve seat, and the disc-shaped valve body is closed on the outlet side of the disc-shaped valve body. A coil spring biasing in the valve direction is disposed, a rib is provided on the inner peripheral wall of the valve casing, and the outer periphery of the disc-shaped valve body is slid on the inner surface of the rib.

[0003]

The above-mentioned conventional spring-biased check valve is provided with a spring-biased valve when the transportation of the fluid is stopped and the fluid pressure at the inlet falls substantially equal to the fluid pressure at the outlet. In order for the valve body to sit on the annular valve seat and close the valve,
A fluid reservoir is formed on the inlet side.

[0004] The reservoir of the fluid becomes a culture site for bacteria,
There is a problem that bacteria proliferate at the time of rest and cause serious accidents particularly when used in the food and medical fields.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a spring-loaded disc check valve which allows the fluid at the inlet to pass to the outlet at rest when the transportation of fluid is stopped.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made to solve the above problems by providing an inlet and an outlet by valve casing, providing an annular valve seat between the inlet and the outlet, and providing an annular valve seat. A flat valve body is spring-biased on the outlet side of the valve seat so that it can be separated and seated freely, allowing the passage of fluid in the forward direction but closing the fluid in the reverse direction. A sleeve that slides on the inner circumference of the valve seat is fixed, a through hole is provided on the valve body side of the sleeve, and a spring that biases the valve body in the valve closing direction via the sleeve is arranged. The spring is a spring-loaded disc check valve characterized in that the spring displaces the valve body to a position slightly away from the annular valve seat when the inlet and outlet fluid pressures are equal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS At rest, when the inlet and outlet fluid pressures are equal, the valve body is displaced to a position slightly away from the annular valve seat by a spring, so that the inlet fluid passes through the through hole to the outlet. be able to.

When the inlet fluid pressure becomes higher than the outlet fluid pressure, the valve body moves further away from the annular valve seat against the spring by the inlet fluid pressure, thereby passing more fluid to the outlet. Let it.

When the fluid pressure at the outlet becomes higher than the fluid pressure at the inlet, the valve element displaced to a position slightly separated from the annular valve seat by the spring is seated on the annular valve seat by the fluid pressure at the outlet, thereby allowing the inlet to move. Prevent backflow of fluid to the

[0010]

1, an inlet member 2 provided with an inlet 1 and an outlet member 4 provided with an outlet 3, an annular valve seat 5 provided between the inlet 1 and the outlet 3, and an outlet 3 of the annular valve seat 5. A flat plate-shaped valve element 6 arranged on the side constitutes a spring-biased disk check valve.

A valve chamber 8 is formed by the inlet member 2 and the outlet member 4, and an annular valve seat 5 is attached to an end of the inlet member 2 on the valve chamber 8 side. The annular valve seat 5 is made of a synthetic rubber or a synthetic resin, or a copper or stainless metal material in accordance with the type of fluid passing therethrough. Contact the sealing surface.

A cylindrical sleeve 15 is provided on the inlet 1 side of the valve body 6.
Are integrally formed. The outer diameter of the sleeve 15 is
Is slightly smaller than the inner diameter of the annular valve seat 5 so that the inner periphery of the annular valve seat 5 can slide. A plurality of through holes 16 penetrating through the sleeve 15 are provided on the valve 15 side of the sleeve 15. A spring receiver 17 is fixed to the end of the sleeve 15 on the inlet 1 side, and between the spring receiver 17 and the end of the annular valve seat 5, the sleeve 1 is fixed.
A coil spring 11 as an urging means is arranged outside of the coil spring 5. Coil spring 11 for urging valve body 6 toward annular valve seat 5
Is formed as a spring force for displacing the valve body 6 to a position slightly separated from the annular valve seat 5 when the fluid pressures at the inlet 1 and the outlet 3 are equal.

A plurality of ribs 18 are mounted inside the inlet member 2 so that the spring receiver 17 can slide up and down along the ribs 18. A screen 1 having a large number of small holes of mesh shape between the through hole 16 and the inner circumference of the sleeve 15
9 is attached. When the valve body 6 is separated from the annular valve seat 5, the fluid from the inlet 1 flows down from the inside of the sleeve 15 to the outlet 3 through the screen 19 and the through hole 16.

At rest, when the fluid pressures at the inlet 1 and the outlet 3 are equal, the valve body 6 is displaced by the coil spring 11 to a position slightly away from the annular valve seat 5, so that the fluid at the inlet 1 is moved to the sleeve 15. Screen 19 and through hole 16 from inside
Through to the outlet 3.

When the fluid pressure at the inlet 1 becomes higher than the fluid pressure at the outlet 3, the valve body 12 further moves away from the annular valve seat 5 against the spring force of the coil spring 11 by the fluid pressure at the inlet 1. Allows more fluid to pass through to the outlet 3.

When the fluid pressure at the outlet 3 becomes higher than the fluid pressure at the inlet 1, the valve body 12, which is displaced to a position slightly separated from the annular valve seat 5 by the coil spring 11, moves to the outlet 3.
Is seated on the annular valve seat 5 by the fluid pressure of
Prevents the fluid from flowing back to the inlet 1.

[0017]

As described above, in the spring-loaded disc check valve according to the present invention, the valve body is displaced to a position slightly separated from the annular valve seat by the spring when the fluid pressure at the inlet and the outlet is equal and at rest. So that the fluid at the inlet can be passed to the outlet. Therefore, propagation of bacteria can be prevented, and it can be used in the food and medical fields.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a spring-biased disc check valve according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 3 Outlet 5 Annular valve seat 6 Valve body 11 Coil spring 15 Sleeve 16 Through hole

Claims (1)

[Claims] An inlet and an outlet are formed by valve casing, an annular valve seat is provided between the inlet and the outlet, and a flat valve body is spring-biased on the outlet side of the annular valve seat to be detachably seated. In this arrangement, a fluid sliding in the inner circumference of the annular valve seat is fixed to the valve body to allow the fluid in the forward direction to pass but close the fluid in the reverse direction. And a spring for urging the valve body in the valve closing direction via a sleeve. When the fluid pressures at the inlet and outlet are equal, the spring moves the valve body into an annular valve seat. A spring-loaded disk-type check valve characterized in that the valve is displaced to a position slightly away from the seat.