Fluid handling – Pressure modulating relays or followers
Patent
1984-08-06
1987-05-12
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
13762564, 2511291, G05D 1600, F16K 3106
Patent
active
046641351
ABSTRACT:
A pilot valve suited for use as the first stage of a large hydraulic valve system. The pilot valve virtually eliminates the steady state fluid leakage associated with orifice-based prior art systems. A pair of low noise and long life fluid restrictors are employed having flat openings thereto over which a flexible metal strip is disposed. The ends of the strip adjacent each opening are attached to one edge of rolling members whereby they can be rolled progressively off of and over the openings by an electrically driven actuator. In this manner, fluid flow through the two restrictor paths are controlled simultaneously to change the amount of fluid passing therethrough. Taps are provided in each restrictor for taking out the control fluid flow and pressure which are applied to the main valve as the driving means thereto.
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Cohan Alan
Etlinger Louis
Sanders Associates Inc.
Weinstein Stanton D.
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