JPH10288266A - Spring energizing check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spring energizing check valve which is capable of securing a passing flow rate even when the flow rate from an entrance is little. SOLUTION: A valve element 6 which is energized by a coil spring 11 is arranged on an exit 3 side of an annular valve seat 5. A communicating hole 12 communicating an entrance 1 and the exit 3 is provided on the valve element 6. On the exit 3 side of the communicating hole 12, an auxiliary valve element 7 energized by a coil spring 14 is arranged. Even when a fluid from the entrance 1 is little, the auxiliary valve element 7 opens at first and the fluid is made to flow down to the exit 3 side from the communicating hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is mounted on a fluid pipe and allows a fluid to flow in a forward direction by a spring-biased valve body provided therein, but closes the flow in the reverse direction. The present invention relates to a spring-biased check valve capable of flowing a relatively large flow rate even when the flow rate is small.

[0002]

2. Description of the Related Art An example of a spring-loaded check valve is disclosed in Japanese Utility Model Publication No. 49-3.
No. 6740. 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 has a disadvantage that the flow rate from the inlet to the outlet is small.
There is a problem that the passage area is not sufficiently secured, the pressure loss increases, and the small flow rate further decreases.

[0004] When the flow rate from the inlet is small, the valve opening force acting on the valve element is also small, and the valve element that is biased by the spring cannot be separated from the valve seat by a sufficient distance. The opening degree of the body is not sufficiently secured, the flow path resistance is increased, the pressure loss is increased, and the small flow rate is further reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spring-loaded check valve capable of ensuring a sufficient flow rate by minimizing a pressure loss even when the flow rate from an inlet is small.

[0006]

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems by providing an inlet and an outlet by valve casing, providing an annular valve seat between the inlet and the outlet, A flat valve body is spring-biased at the outlet side of the annular 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 communication hole communicating the inlet and the outlet is provided in the valve body, and the auxiliary valve body is detachably attached to and detached from the communication hole, and the auxiliary valve body is biased toward the through hole side of the valve body. This is one in which an urging spring is arranged.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When a flow rate from an inlet is small, a spring-biased valve body does not open while being seated on a valve seat, but an auxiliary valve mounted opposite a communication hole of the valve body. Even if the valve body has a small flow rate, the fluid can flow from the inlet to the outlet by separating from the communication hole and opening the communication hole against the spring force of the auxiliary biasing spring.

[0008] When the flow rate from the inlet increases, the seated valve body also moves away from the valve seat, causing the fluid that cannot flow down from the auxiliary valve body to flow to the outlet. When the fluid pressure at the outlet side becomes higher than that at the inlet side, the fluid at the outlet side tends to flow back to the inlet side.However, the auxiliary valve body biased by the auxiliary valve body closes the communication hole and is provided with a spring. When the urged valve element is seated on the valve seat, backflow of the fluid to the inlet side is prevented.

[0009]

In FIG. 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 side of the annular valve seat 5 are provided. A spring-biased check valve is constituted by the flat plate-shaped valve element 6 arranged and the auxiliary valve element 7 further attached to the outlet 3 side of the valve element 6.

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.

The valve body 6 is provided with a plurality of ribs 9 having a diameter slightly smaller than the inner diameter of the valve chamber 8 so as to be slidable left and right in the valve chamber 8. The coil spring 11 as the urging means is arranged in a compressed state. Accordingly, the valve element 6 is constantly urged toward the annular valve seat 5 by the spring force of the coil spring 11.

A communication hole 12 for communicating the inlet 1 and the outlet 3 is provided at the center of the valve body 6, and the auxiliary valve body 7 is arranged facing the outlet 3 side of the communication hole 12. The auxiliary valve element 7 is a flat plate having a size capable of covering the communication hole 12 and is made of synthetic rubber, synthetic resin, or a metal material, like the annular valve seat 5. A coil spring 14 as an urging means is also provided on the outlet 3 side of the auxiliary valve element 7.
Is disposed in a compressed state with the spring receiver 10 to constantly urge the auxiliary valve element 7 toward the communication hole 12 of the valve element 6.

The valve element 6 and the auxiliary valve element 7 are urged toward the inlet 1 by coil springs 11 and 14, respectively.
The spring strength of the coil spring 14 for urging the auxiliary valve body 7 is smaller than that of the coil spring 11 for urging the valve body 6, and the fluid pressure from the inlet 1 As a result, the auxiliary valve element 7 first opens the communication hole 12 and then the fluid pressure from the inlet 1 rises to a predetermined value and the valve element 6
Is formed so as to separate from the annular valve seat 5 and open.

When the fluid flows down from the inlet 1 and the fluid pressure is almost equal to zero, both the valve body 6 and the auxiliary valve body 7 remain energized by the coil springs 11 and 14 and the annular valve seat 5 And the valve body 6 is seated, so that the fluid does not pass to the outlet 3.

When the fluid pressure rises and becomes, for example, about 0.05 to 0.1 KG, the auxiliary valve element 7 urged by the coil spring 14 having a small spring constant opens the communication hole 12 and opens the inlet port. The fluid from 1 flows down to the outlet 3. Therefore,
Even if the fluid pressure is low, the auxiliary valve element 7 opens the communication hole 12 and communicates the inlet 1 and the outlet 3 before the valve element 6 opens, thereby ensuring a sufficient flow rate. it can.

When the fluid pressure from the inlet 1 further increases,
Not only the auxiliary valve element 7 but also the valve element 6 overcomes the spring force of the coil spring 11 and separates from the annular valve seat 5, so that more fluid flows down to the outlet 3 through the space of the rib 9.

When the fluid pressure on the outlet 3 side becomes higher than the fluid pressure on the inlet 1 side, the fluid on the outlet 3 side tends to flow back to the inlet 1 side. 12 is closed, and the valve body 6 is seated on the annular valve seat 5 to prevent the fluid from flowing back to the inlet 1 side.

In this embodiment, an example of a so-called disc-type check valve using a plate-shaped valve element 6 as the check valve has been described.
Other check valves, for example, a swing check valve or a wafer check valve, can be used as well.

[0019]

As described above, in the spring-biased check valve according to the present invention, since the auxiliary valve body urged by the auxiliary spring is mounted to face the communication hole of the valve body, the flow rate from the inlet can be reduced. Even if the number is small, only the auxiliary valve element opens the communication hole, so that the pressure loss can be reduced, and the flow rate to the outlet side can be secured.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 3 Outlet 5 Annular valve seat 6 Valve body 7 Auxiliary valve body 9 Rib 10 Spring receiver 11 Coil spring 12 Communication hole 14 Coil spring

Claims (1)

[Claims] 1. 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 separate the seat. By freely arranging, in the one that allows the passage of fluid in the forward direction but closes the fluid in the reverse direction, a communication hole that connects the inlet and the outlet to the spring-biased valve body is provided, and the communication hole is A spring-biased check valve characterized in that an auxiliary valve body is attached to be detachable and seated oppositely, and an auxiliary biasing spring for biasing the auxiliary valve body toward a through hole of the valve body is disposed.