JPH1182774A - 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 3. 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. A communication hole 16 connecting the inlet 1 to the outlet 3 is arranged in the valve element 12. An auxiliary valve element 17 is arranged on the outlet 3 side of the communication hole 16. An auxiliary coil spring 19 energizing the auxiliary valve element 17 onto the communication hole 16 side is arranged. When a fluid pressure in the inlet 1 is equal to that in the outlet 3, the auxiliary coil spring 19 energizes the auxiliary valve element 17 to the position in which the communication hole 16 is opened slightly.

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 urges the valve body to the annular valve seat, the forward direction fluid is allowed to pass, but the reverse direction fluid is closed. A communication hole that communicates the inlet and the outlet with the biased valve body is provided, an auxiliary valve body is provided opposite the communication hole, and an auxiliary spring that urges the auxiliary valve body to the communication hole is provided. A spring-operated check valve characterized in that when the fluid pressures are equal, the auxiliary valve body is displaced to a position where the communication hole is slightly opened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS At the time of rest when fluid pressures at an inlet and an outlet are equal, a spring-loaded valve body is seated on an annular valve seat and remains closed, but an auxiliary valve body has a communication hole formed by an auxiliary spring. Is displaced to a position slightly opened to open a communication hole. This allows the fluid at the inlet to pass through the communication hole to the outlet.

When the fluid pressure at the inlet becomes higher than the fluid pressure at the outlet, the auxiliary valve body further increases the opening of the communication hole against the auxiliary spring by the fluid pressure at the inlet. The valve body that has been closed also opens from the annular valve seat against the spring due to the fluid pressure at the inlet. This allows more fluid to pass to the outlet.

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. The auxiliary valve element displaced to a position where the communication hole is slightly opened by the auxiliary spring closes the communication hole by the fluid pressure at the outlet. This prevents backflow of the fluid 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 is disposed between the valve body 12 and the spring receiver 14 in a compressed state. Therefore, the valve element 12 is constantly urged toward the annular valve seat 11 by the spring force of the coil spring 13.

A communication hole 16 for communicating the inlet 1 and the outlet 3 is provided at the center of the valve body 12, and an auxiliary valve body 17 is arranged facing the outlet 3 side of the communication hole 16. The auxiliary valve element 17 is connected to the communication hole 1.
6 is a sphere large enough to close
Auxiliary coil spring 19 as biasing means disposed between
Urges the communication hole 16 side.

An auxiliary coil spring 19 for urging the auxiliary valve element 17 toward the communication hole 16 displaces the auxiliary valve element 17 to a position where the communication hole 16 is slightly opened when the fluid pressures at the inlet 1 and the outlet 3 are equal. Formed by spring force. The auxiliary valve element 17, the spring receiver 18, and the auxiliary coil spring 19 are also formed of a corrosion-resistant material such as stainless steel.

At rest, when the fluid pressures at the inlet 1 and the outlet 3 are equal, the spring-biased valve body 12 remains seated on the annular valve seat 11 while the auxiliary valve body 17 is closed by the auxiliary coil spring 19. Is displaced to a position where the communication hole 16 is slightly opened,
The communication hole 16 is opened. This allows the fluid at the inlet 1 to pass through the communication hole 16 to the outlet 3.

When the fluid pressure at the inlet 1 becomes higher than the fluid pressure at the outlet 3, the auxiliary valve element 17 further increases the opening of the communication hole 16 against the auxiliary coil spring 19 by the fluid pressure at the inlet 1. I do. In addition, the valve body 12 that was closed is also the inlet 1
Is opened from the annular valve seat 11 against the spring 13 by the fluid pressure. This allows more fluid to pass to outlet 3.

When the fluid pressure at the outlet 3 becomes higher than the fluid pressure at the inlet 1, the valve body 12 adjusts the fluid pressure at the outlet 3 and the spring 13.
Thereby, the annular valve seat 11 is seated. The auxiliary valve element 17 displaced to a position where the communication hole 16 is slightly opened by the auxiliary spring 19 closes the communication hole 16 by the fluid pressure at the outlet 3. This prevents the backflow of the fluid to the inlet 1.

In this embodiment, a disk-type 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. Further, the auxiliary valve element 17 can be not only a sphere but also other shapes.

[0019]

As described above, the spring-loaded check valve according to the present invention is such that the auxiliary valve is displaced to a position where the communication hole is slightly opened by the auxiliary biased spring at the time of stoppage when the fluid pressures at the inlet and outlet are equal. Since the body has opened the communication hole, the fluid at the inlet can be passed to the outlet, so that the growth 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;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 2 Inlet member 3 Outlet 4 Outlet member 5 Gasket 8,9 Clamp 10 Screw 11 Annular valve seat 12 Valve 13 Coil spring 15 Rib 16 Communication hole 17 Auxiliary valve 19 Auxiliary coil spring

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 passage of fluid in the forward direction is allowed but the fluid in the reverse direction is closed, and a communication hole that connects the inlet and the outlet to the spring-biased valve element is provided, facing the communication hole. In addition to providing an auxiliary valve body, an auxiliary spring for urging the auxiliary valve body to the communication hole is provided, and the auxiliary spring is provided at a position where the communication hole is slightly opened when the inlet and outlet fluid pressures are equal. A spring-loaded check valve characterized by being displaced.