JPH1182772A - Spring energized check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring energized check valve in which fluid in an inlet can be passed toward an outlet during a stopping time when fluid transportation is stopped. SOLUTION: A valve casing is formed of an inlet member 2 provided with an inlet 1 and an outlet member 4 provided with an outlet 4. Between the inlet 1 and the outlet 3, a ring type valve seat 11 is arranged. A valve element 12 is arranged on the outlet 3 side in the ring type valve seat 11. A coil spring 13 energizing the valve element 12 toward the ring type valve seat 11 is arranged. The valve element 12 is displaced by means of the coil spring 13 from the ring type valve seat 11 to the position apart from the valve seat 11 when a fluid pressure in the inlet 1 is equal to that in the outlet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring which is attached to a fluid pipe and allows a forward flow of fluid from an inlet to an outlet by a spring-biased valve provided therein, but closes the reverse flow. The present invention relates to a biased check valve, and more particularly to a spring-biased 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 check valve is disclosed in Japanese Utility Model Laid-Open No. 60-1.
No. 0964. 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 outer periphery of the disc-shaped valve body, and the outer end of the rib is slidably in contact with the inner peripheral wall of the valve casing.

[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.

[0005] It is therefore an object of the present invention to provide a spring-loaded check valve which allows the fluid at the inlet to pass to the outlet at rest when fluid transport 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. By disposing a valve body on the outlet side of the valve seat and providing a spring that biases the valve body to the annular valve seat, the passage of fluid in the forward direction is allowed, but the fluid in the reverse direction is closed. A spring-loaded check valve characterized in that a valve body is displaced to a position slightly separated from an annular valve seat when fluid pressures at an inlet and an outlet are equal.

[0007]

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

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 is higher than the fluid pressure at the inlet, the valve body is seated on the annular valve seat by the fluid pressure at the outlet and a spring, thereby preventing the fluid from flowing back to the inlet.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the present invention will be described (see FIGS. 1 and 2). A valve casing is formed by an inlet member 2 provided with an inlet 1, an outlet member 4 provided with an outlet 3, and a gasket 5 interposed between the two members. The valve casing is fastened by fastening clamps 8, 9 having hinges 6, 7 with screws 10. The inlet member 2 and the outlet member 4 are formed of a corrosion-resistant material such as stainless steel, and the gasket 5 is formed of synthetic rubber or synthetic resin according to the type of fluid.

An annular valve seat 11 is formed at the inner end of the inlet member 2, and a flat valve body 12, a coil spring 13 as a biasing means, and a spring receiver 14 are arranged on the outlet 3 side of the annular valve seat 11. The valve body 12, the coil spring 13, and the spring receiver 14 are made of a corrosion-resistant material such as stainless steel, like the entrance / exit members 2 and 4.

The valve body 12 has a plurality of ribs 15 having a diameter slightly smaller than the inner diameter of the outlet member 4 on the outer periphery so as to be slidable up and down. The coil spring 13 for urging the valve body 12 toward the annular valve seat 11 has a spring force for displacing the valve body 12 to a position slightly separated from the annular valve seat 11 when the fluid pressures at the inlet 1 and the outlet 3 are equal. Form.

At rest, when the fluid pressures at the inlet 1 and the outlet 3 are equal, the valve body 12 is displaced by the coil spring 13 to a position slightly away from the annular valve seat 11, so that the fluid at the inlet 1 passes through the outlet 3. be able to.

When the fluid pressure at the inlet 1 becomes higher than the fluid pressure at the outlet 3, the valve body 12 is further separated from the annular valve seat 11 against the spring force of the coil spring 13 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 is seated on the annular valve seat 11 by the fluid pressure at the outlet 3 and the spring force of the coil spring 13, so that the valve 1 Prevent backflow of fluid.

In this embodiment, a disk check valve using a flat plate as the valve body 12 has been exemplified. However, a valve body having another shape such as a sphere, a swing type or a wafer type can be used. Etc. can be applied to the check valve.

[0017]

As described above, in the spring-loaded 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 inlet and outlet fluid pressures are equal to each other at rest. 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 check valve of the present invention.

FIG. 2 is a plan view of the clamp of FIG. 1;

[Description of Signs] 1 inlet 2 inlet member 3 outlet 4 outlet member 5 gasket 8,9 clamp 10 screw 11 annular valve seat 12 valve body 13 coil spring 15 rib

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, a valve body is disposed on an outlet side of the annular valve seat, and the valve body is attached to the annular valve seat. By providing a biasing spring, the fluid in the forward direction is allowed to pass through but the fluid in the reverse direction is closed.The spring slightly separates the valve body from the annular valve seat when the inlet and outlet fluid pressures are equal. A spring-biased check valve characterized by being displaced to a predetermined position.