Normally closed fluid switching logic element

Details Normally closed fluid switching logic element Normally closed fluid switching logic element

1987-07-06

1989-01-03

Jones, Larry

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251 12, 137 87, F16K 31143

Patent

active

047951290

ABSTRACT:
A normally closed fluid switching logic element has a plurality of radial ports to a first chamber. A poppet, connected to a piston within the element, moves between an open position off its poppet seat and a closed position. In the open position another port is provided to the first chamber permitting fluid flow. The poppet is biased to the closed position by a spring, but also by fluid pressure at either or both ports. The poppet may be displaced only by pressure in a second chamber behind the piston. In one configuration this opening pressure is provided from an external source. In other configurations, the opening pressure is derived from the first chamber, from the pressure outside the poppet and from either of these.

REFERENCES:
patent: 4291718 (1981-09-01), Sanin et al.
patent: 4304253 (1981-12-01), Roger
patent: 4391293 (1983-07-01), Keenan

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