JP2010144755A - Spring energized check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring energized check valve adjusting a flow rate flowing down to an outlet from an inlet through the communication hole of a valve element. <P>SOLUTION: An inlet 1 and an outlet 3 are formed by a valve casing comprising an inlet member 2 and an outlet member 4. An annular valve seat 5 is provided between the inlet 1 and the outlet 3, and the valve element 6 is disposed on the outlet 3 side of the annular valve seat 5 in such a manner that the same is energized by a spring and is freely seated on and separated from a seat. A communication hole 12 providing communication to the inlet 1 and the outlet 3 is provided in the valve element 6 energized by the spring, and an auxiliary valve element 7 is disposed oppositely to the communication hole 12 in such a manner that the same can be freely seated on and separated from the seat. An auxiliary energizing spring 14 energizing the auxiliary valve element 7 to the communication hole 12 side of the valve element 6 is disposed. A flow rate adjusting member 15 including a plurality of small communication holes 17a, 17b, 17c, and attached to the valve element 6 with desired numbers of small communication holes oppose to the communication hole 12 is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is attached to a fluid pipe such as liquid or gas, and allows a forward flow of the fluid from the inlet to the outlet by the spring-biased valve body provided inside, but the reverse direction, that is, the flow from the outlet to the inlet is not allowed. More particularly, the present invention relates to a spring-biased check valve that can flow a relatively large flow rate even when the passage flow rate is small.

  A conventional spring-biased check valve is disclosed in Japanese Patent Laid-Open No. 10-288266. This is because the valve casing forms an inlet and an outlet, an annular valve seat is provided between the inlet and the outlet, and the valve body is spring-biased on the outlet side of the annular valve seat so that it can be freely attached and detached. An auxiliary urging spring for providing a communicating hole for communicating the inlet and the outlet of the valve body, disposing the auxiliary valve body so as to be detachable so as to face the communicating hole, and urging the auxiliary valve body toward the communicating hole side of the valve body Is arranged. When the flow rate from the inlet is small, the spring-biased valve body does not open while sitting on the valve seat, but the auxiliary valve body mounted facing the communication hole of the valve body has a low flow rate. The fluid can flow down from the inlet to the outlet by separating from the communication hole against the spring force of the auxiliary biasing spring and opening the communication hole. When the flow rate from the inlet increases, the seated valve body also moves away from the valve seat, and the fluid that cannot flow down from the communication hole of the valve body flows down to the outlet. When the fluid pressure on the outlet side becomes higher than that on the inlet side, the fluid on the outlet side tends to flow backward to the inlet side, but the auxiliary valve body biased by the auxiliary biasing spring closes the communication hole and When the biased valve body is seated on the valve seat, the backflow of fluid to the inlet side is prevented.

The conventional spring-biased check valve has a problem that the flow rate flowing from the inlet to the outlet through the communication hole of the valve body cannot be adjusted.
Japanese Patent Laid-Open No. 10-288266

  The problem to be solved is to provide a spring-biased check valve capable of adjusting the flow rate flowing from the inlet to the outlet through the communication hole of the valve body.

  In the present invention, an inlet and an outlet are formed by a valve casing, an annular valve seat is provided between the inlet and the outlet, and the valve body is spring-biased on the outlet side of the annular valve seat so as to be freely attached and detached. Provided with a communication hole that connects the inlet and the outlet to the valve body that has been urged, the auxiliary valve body is detachably seated opposite the communication hole, and the auxiliary valve body is urged toward the communication hole side of the valve body In the arrangement of the spring, a flow rate adjusting member that has a plurality of small communication holes and that is attached to the valve body with a desired number of small communication holes facing the communication holes is provided.

  The spring-biased check valve of the present invention has an inlet through the communication hole of the valve body by attaching a flow rate adjusting member to the valve body with a desired number of small communication holes facing the communication hole so as to obtain a desired flow rate. Since the flow rate flowing from the outlet to the outlet can be adjusted by the number of small communication holes, it is possible to provide a spring biased check valve capable of adjusting the flow rate flowing from the inlet to the outlet through the communication hole of the valve body. This produces an excellent effect of being able to.

  The present invention is provided with a flow rate adjusting member that has a plurality of small communication holes and is attached to the valve body with a desired number of small communication holes facing the communication holes. Therefore, the flow rate flowing from the inlet to the outlet through the communication hole of the valve body is reduced by connecting the flow rate adjusting member to the valve body with the desired number of small communication holes facing the communication hole so as to obtain a desired flow rate. It can be adjusted by the number of holes.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). 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 a flat plate disposed on the outlet 3 side of the annular valve seat 5. The valve body 6 and the flat auxiliary valve body 7 arranged further on the outlet 3 side of the valve body 6 constitute a spring-biased check valve. A valve casing is formed by the inlet member 2 and the outlet member 4, a valve chamber 8 is formed inside, and an annular valve seat 5 is attached to the end of the inlet member 2 on the valve chamber 8 side. The annular valve seat 5 is made of a synthetic rubber, a synthetic resin, or a copper-based or stainless-based metal material according to the type of fluid passing therethrough, and a flat valve body 6 disposed in the valve chamber 8 and one end side. Abut 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 and is urged between the spring receiver 10 attached to the outlet 3 side. The coil spring 11 as a means is arranged in a compressed state. Accordingly, the valve body 6 is constantly urged toward the annular valve seat 5 by the spring force of the coil spring 11. A communication hole 12 that communicates the inlet 1 and the outlet 3 is provided in the central portion of the valve body 6, and the auxiliary valve body 7 is disposed facing the outlet 3 side of the communication hole 12. The auxiliary valve body 7 is a flat plate having a size capable of covering the communication hole 12 and is made of a synthetic rubber, a synthetic resin, or a metal material like the annular valve seat 5. A coil spring 14 as a biasing means is also arranged in a compressed state between the auxiliary valve body 7 on the outlet 3 side and the spring receiver 10 so that the auxiliary valve body 7 is always biased toward the communication hole 12 side of the valve body 6. Let

  The valve body 6 and the auxiliary valve body 7 are urged toward the inlet 1 side by coil springs 11 and 14, respectively. The spring strength of the coil springs 11 and 14 is that of the coil spring 14 that urges the auxiliary valve body 7. However, the spring constant is smaller than that of the coil spring 11 that urges the valve body 6, and the auxiliary valve body 7 first opens the communication hole 12 by the fluid pressure from the inlet 1, and then from the inlet 1. The fluid pressure is increased to a predetermined value so that the valve body 6 is separated from the annular valve seat 5 and opened. A flat plate flow rate adjusting member 15 is attached to the side surface of the inlet 1 of the valve body 6 with a set screw 16. In FIG. 2, the flow rate adjusting member 15 has three small communication holes 17a, 17b, and 17c having the same opening area on the upper circumference. The opening area of the communication hole 12 is larger than the total opening area of the three small communication holes 17a, 17b, and 17c, and one to three desired numbers of small communication holes can be opened. The illustration shows a state in which three small communication holes 17a, 17b, and 17c are opened to face the communication hole 12, and one small communication hole is formed by rotating the flow rate adjusting member 15 and attaching it to the valve body 6. It is possible to close and open two small communication holes, or to close two small communication holes and open one small communication hole. The broken line indicates the communication hole 12 of the valve body 6.

  When fluid flows down from the inlet 1, when the fluid pressure is almost equal to zero, both the valve body 6 and the auxiliary valve body 7 remain biased by the coil springs 11 and 14, and the annular valve seat 5 and the valve body. 6 is seated and no fluid passes through the outlet 3. When the fluid pressure rises to, for example, about 0.05 to 0.1 KG, the auxiliary valve body 7 urged by the coil spring 14 having a small spring constant opens the communication hole 12 and fluid from the inlet 1 Is allowed to flow down from the small communication holes 17a, 17b, 17c through the communication hole 12 to the outlet 3. Therefore, even when the fluid pressure is low, the auxiliary valve body 7 opens the communication hole 12 before the valve body 6 opens, and the inlet 1 and the outlet through the communication hole 12 from the small communication holes 17a, 17b, 17c. By connecting 3, the passage flow rate can be secured. When the flow rate flowing from the inlet 1 to the outlet 3 through the communication hole 12 of the valve body 6 is reduced, the flow rate adjusting member 15 is rotated and attached to the valve body 6, one small communication hole is closed, and two small communication holes are closed. Or the two small communication holes are closed and one small communication hole is opened, so that the flow rate can be reduced sequentially. When the fluid pressure from the inlet 1 further increases, not only the auxiliary valve body 7 but also the valve body 6 overcomes the spring force of the coil spring 11 and separates from the annular valve seat 5, thereby allowing the space of the rib 9 to pass through. More fluid flows down to the outlet 3. 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 backward to the inlet 1 side, but the auxiliary valve body 7 closes the communication hole 12 by the fluid flow and pressure. At the same time, the valve body 6 is seated on the annular valve seat 5 to prevent backflow of fluid to the inlet 1 side.

It is sectional drawing which shows the Example of the spring-biased check valve of this invention. It is a left view of the flow volume adjustment member of FIG.

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 16 Flow rate adjustment member 17a, 17b, 17c Small communication hole

Claims (1)

The valve casing forms an inlet and an outlet, an annular valve seat is provided between the inlet and the outlet, the valve body is spring-biased on the outlet side of the annular valve seat, and the valve body is spring-biased. Provided with a communication hole for communicating the inlet and the outlet, the auxiliary valve body is arranged so as to be able to be attached and detached so as to face the communication hole, and an auxiliary biasing spring for urging the auxiliary valve body toward the communication hole side of the valve body is arranged. A spring-biased check valve having a plurality of small communication holes and a flow rate adjusting member attached to the valve body with a desired number of small communication holes facing the communication holes.

Images