JPH0536512U - Pressure reducing valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a pressure reducing valve that can change the pressure reducing pressure with a small force when reducing the pressure of a fluid. [Structure] (1) A primary pressure chamber and (2) a secondary pressure chamber are provided independently of each other and the mutual distance is changed to provide a pressure reducing valve capable of changing the pressure reducing pressure with a small force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure reducing valve that can change the pressure with a slight force by changing the mutual positional relationship between the primary chamber and the secondary chamber when decompressing a fluid.

[0001]

[Prior Art]

 There are two types of pressure reducing valves depending on the opening direction. That is, as shown in FIG. 3, there are a type in which the valve is opened downstream in which the fluid flows and a type in which the valve is opened upstream as shown in FIG. In either type, the product of the effective pressure receiving area of the diaphragm and the secondary pressure is applied to the (10) pressure adjusting screw. That is, the secondary pressure is applied to the diaphragm, and the resulting force is (8) applied to the pressure adjusting screw via the pressure adjusting spring. Therefore, due to the large flow rate, the effective pressure receiving area of the diaphragm is large, the secondary pressure is high, or both, a large force is applied to the pressure adjustment screw, making it difficult to change the pressure. It is necessary to make the screws etc. have a structure that can withstand a sufficient force. In the prior art, in order to solve this, the pressure of the fluid is used instead of the pressure adjusting spring, and a small pressure reducing valve, that is, a pilot pressure reducing valve is used to change the pressure of the fluid on behalf of this spring, and Some have solved it by performing a modification operation, but this makes the structure complicated and therefore expensive to manufacture.

[0002]

[Problems to be solved by the device]

 In this invention, the primary chamber and the secondary chamber are not provided in the common body but separately provided, and the force due to the secondary pressure applied to the diaphragm is applied to one wall of the main body of the secondary chamber via the pressure adjusting spring. Since this wall has a fixed positional relationship with the secondary chamber, it does not exert its force on the outside of the secondary chamber, but by changing the positional relationship between the secondary chamber and the primary chamber, a slight force can change the pressure. I thought about realizing a pressure reducing valve that can do it.

[0003]

[Means for Solving the Problems]

 As the basic structure of the pressure reducing valve, a type in which the valve opens downstream is adopted. In FIG. 1, (1) A valve opening (5) facing the downstream side is provided on the most downstream side of the primary chamber. (6) Arrange the valve so that the valve port can be closed. This valve body is (7) integrated with the diaphragm and slides on the lower side of the primary chamber body (3) via the (11 ') oling for fluid sealing downstream from the valve body. On the other hand, the diaphragm slides inside the secondary chamber body (12) through the (11) auring. (8) One end of the pressure adjusting spring is in contact with the side of the diaphragm opposite to the secondary chamber, and the other end is (12) received by the wall of the main body of the secondary chamber. The structure of (12) the secondary chamber body, which incorporates the valve body, diaphragm, and pressure adjustment spring, is such that the mutual position can be changed on the same axis as the (3) primary chamber body. This mutual positional relationship can be changed by turning the (10) pressure adjusting screw.

[0005]

[Action]

 In FIG. 1, when (3) the primary chamber main body and (12) the secondary chamber main body are brought closest to each other by rotating the (10) pressure adjusting screw, (8) the pressure adjusting spring is not compressed at all, Therefore, the force of the downward spring in the figure is not applied to the diaphragm (7). Then, (4) the valve is closed by the valve closing spring, and the secondary pressure becomes zero. Then, (10) turn the pressure adjusting screw so that (12) the secondary chamber body is moved away from (3) the primary chamber body, the valve opens and the fluid flows to (2) the secondary chamber, increasing the secondary pressure. . This secondary pressure (7) pushes up the diaphragm, (8) compresses the pressure adjustment spring, balances the force of the spring with the product of the effective pressure receiving area of the diaphragm and the secondary pressure, and adjusts the valve opening. To do. Thus, a constant secondary pressure is maintained. Assuming that the valve opening is constant, (3) When the distance between the primary chamber body and (12) secondary chamber body is increased, (7) diaphragm and (8) pressure adjusting spring contacts (7) diaphragm. The distance from the wall of the secondary chamber body on the side (12) is shortened, and the pressure adjusting spring (8) is further compressed, and the secondary force rises due to the larger force balance with the spring force. On the contrary, when the distance between the (3) primary chamber body and the (12) secondary chamber body is reduced, the secondary pressure decreases. (10) The force applied to the pressure adjusting screw is the product of the axial projection area of the (11 ') O-ring and the secondary pressure. The outer diameter of the (11 ') O-ring is (7) the outer diameter of the diaphragm. Therefore, (11) the outer diameter is 1/3 to 1/4 of the outer diameter of the O-ring. It is 1/16 of the pressure reducing valve of 1 to 16, which is a force that can be operated by hand in most cases.

[0006]

【Example】

 An example is shown in FIG. In the principle diagram of FIG. 1, the position of the secondary chamber main body is changed by a pressure adjusting screw at one point on the circumference of the secondary chamber main body, but in the embodiment, the force is evenly applied to the circumference. As shown, a screw with a large diameter is used. Although it may be necessary to install a primary pressure gauge, a secondary pressure gauge, a safety valve, a filter, etc. for practical use, they are not shown.

[0007]

[Effect of the device]

 The primary chamber and the secondary chamber are independent, and the secondary pressure is changed by changing the mutual positional relationship, so a large force is not required to change the pressure. Therefore, the operation becomes easier and the pressure adjusting screw and the parts around it are lightly loaded, which improves the operation. Furthermore, since the primary chamber and the secondary chamber are independent, the secondary chamber can freely rotate around its axis with respect to the primary chamber, and there is also a side effect that the direction of the outlet can be freely changed. can get.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a principle of a conventional technique.

FIG. 4 is a diagram showing another example of the principle of the conventional technique.

[Explanation of symbols]

(1) Primary chamber (2) Secondary chamber (3) Primary chamber body (pressure reducing valve body in FIGS. 3 and 4) (4) Valve closing spring (5) Valve opening (6) Valve body (7) ) Diaphragm (8) Pressure adjusting spring (9) Pressure adjusting spring bearing (10) Pressure adjusting screw (11) and (11 ') O-ring (12) Secondary chamber body The white arrow indicates the direction of fluid flow.

Claims (1)

[Scope of utility model registration request] 1. A pressure reducing valve in which the valve opens downstream,
Pressure reducing valve capable of pressure adjustment by changing the mutual positional relationship between the primary chamber and the secondary chamber