Valves

Details Valves Valves

1978-06-14

1980-05-27

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

251DIG3, G05D 1600

Patent

active

042045533

ABSTRACT:
A fluid control valve, especially intended as a pilot valve in pneumatic control systems, in which the controlled flow path is provided by the gaps between adjacent coils of a helical spring. The flow direction is from the outside to the inside of the spring; this allows the valve to seal against high pressures, since the spring will be helped to remain closed by the pressure forces acting thereon.

REFERENCES:
patent: 2638925 (1953-05-01), Monahan
patent: 3749109 (1973-07-01), Rosenfeld
patent: 3976280 (1976-08-01), Alexander

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