Pressure Regulating Valve

Abstract

In order to achieve seal durability and bring about a damping action for a piston-type pressure regulating valve, a pressure regulating valve (10) of the present invention is characterized by a valve moving member (11, 14) moving in such a manner as to cause communication or block communication between a primary chamber (17) and a secondary chamber (19) within a case (21, 26), wherein a plurality of central members (20, 25) are arranged between the case and the valve moving member and the plurality of central members are taken to be different materials. It is then possible to bring about both a damping action and seal durability using the central members by providing central members of different materials.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure regulating valve for regulating fluid pressure. BACKGROUND ART [0002] Pressure regulating valves such as disclosed in, for example, Japanese Utility Model Laid-open Publication No. Hei. 1-178285, exist as pressure regulating valves for reducing pressure of gases. Such pressure-reducing valves are configured from a pressure regulating spring, a piston moving within a cylinder, a valve element, and a return spring etc. Between the piston and cylinder is then sealed using a U-shaped seal. DISCLOSURE OF THE INVENTION [0003] However, there is the problem that rubber seals that are typically used as seals have low durability. Further, when hard resin seal material of high durability is used, it is not possible to obtain a sufficient damping action (attenuating action) with respect to movement (vibration or oscillation, over shoot) of the valve using the rubber seal material and fluctuations in the secondary pressure of the...

AI Technical Summary

Benefits of technology

[0004] It is therefore the object of the present invention to provide a pressure regulating valve capable of providing both durability for a seal material between a valve member (piston) and a case (cylinder) for the valve member and of providing a damping action for suppressing vibration of the valve element and for suppressing overheating.

[0006] By providing central members of different materials, it is possible to bring about both a damping action and seal durability.

[0008] By providing central members of different resistances to sliding, it is possible to bring about both a damping action and seal durability. A central member with a large resistance to sliding (for example, rubber seal material) has a damping action (attenuating action) with respect to vibration of the piston and overshooting. A hard central member (for example, a Teflon group resin etc.) of small resistance to sliding has high durability.

[0010] According to this configuration, the damping member has a function for attenuating moving energy (kinetic energy) using frictional force during movement of the piston and suppresses vibration and overshooting at the time of movement of the piston. As a result, it is possible to make gas pressure fluctuation on the downstream side (secondary side) of the pressure regulating valve small.

[0014] It is further desirable for the central member positioned at the secondary chamber-side of the piston to seal fluids more effectively than the central member on the side of the reference pressure chamber.

[0018] By providing communicating means, the space and the reference pressure chamber are made to communicate, and it is possible to regulate the pressure value of the space at the time of moving the piston. Further, the communicating means may also be utilized in checking a sealed state of a central member during manufacture or when valve abnormalities are detected.

Problems solved by technology

However, there is the problem that rubber seals that are typically used as seals have low durability.

Further, when hard resin seal material of high durability is used, it is not possible to obtain a sufficient damping action (attenuating action) with respect to movement (vibration or oscillation, over shoot) of the valve using the rubber seal material and fluctuations in the secondary pressure of the pressure regulating valve are therefore large.

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