Analysis and Synthesis of a Pressure Compensated Deceleration Valve

概要

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A Pressure Compensated Deceleration Valve (abbreviated as the PCD-valve) is a new type hydraulic valve which combines an ordinary pressure compensated flow control valve (abbreviated as the FC-valve) with a hydraulic deceleration one. Our object is to produce a constant pressure difference between the inlet and outlet of the throttle for the varying input pressure and area of the throttle of this valve, and to obtain, with high response and stability, the flow rate which is proportional to the spool displacement. In this report, the influential factors on the pressure difference between the inlet and outlet of the throttle of this valve, and the methods of improving its static characteristics are discussed. Further, the influential factors on the response and stability are also discussed, and through a frequency response test, the improvements of the dynamic characteristics are presented. With the data obtained from these pre-experiments a PCD-valve was made for trial. Its deceleration characteristics when used in a metering-out circuit are discussed. According to the result, the natural frequency of this PCD-valve increases remarkably and its 0-dB gain range becomes wider than an ordinary FC-valve in the frequency response test.
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