A Study on Unstable Phenomenon and Resonance of a Pressure Regulating Valve

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Abstract
A pressure regulating valve (regulator) is used to keep automatically and sensitively the delivery pressure constant in response to the variation of load in pneumatic pressure transmission lines. Under a certain condition, the regulator occasionally causes in unstable phenomenon and resonance accompanied with the vibration of a spring system and the pressure vibration in chambers of the regulator. In the present paper, to clarify this unstable phenomenon, the effects of the adjusting pressure, the configuration of a pipeline and the elements of the regulator such as the mass of a valve spring system, the spring constant etc. on the response of the regulator have been studied experimentally and theoretically. In the theoretical calculations, the flow in the regulator is solved using a one-dimensional flow model, and the motion of the spring system is solved as a damped vibration of one degree of freedom with external forces. The calculated results fairly agree with the experimental values.

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