Normally closed pilot operated bi-directional poppet valve

Details Normally closed pilot operated bi-directional poppet valve Normally closed pilot operated bi-directional poppet valve

1992-04-27

1992-12-29

Cohan, Alan

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 44, 137493, F16K 31383, F16K 3140

Patent

active

051745445

ABSTRACT:
A normally closed pilot operated bi-directional poppet valve for controlling flow between first and second valve ports. When the pilot valve is closed, pressure is applied from whichever port is at the higher pressure to the poppet in a manner to hold the poppet closed. When the pilot valve is open, pressure is vented to whichever port is at the lower pressure in a manner to allow the poppet to open.

REFERENCES:
patent: 2404349 (1946-07-01), Brant et al.
patent: 2969088 (1961-01-01), Kramer
patent: 3799497 (1974-03-01), Zeuner
patent: 3862738 (1975-01-01), Stumpmeier
patent: 4526340 (1985-07-01), Kelchimsky et al.
patent: 4592533 (1986-06-01), Guglielmi
patent: 4679586 (1987-07-01), Riedel
patent: 5036877 (1991-08-01), Distler
patent: 5072752 (1991-12-01), Kolchinsky

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