Pilot valve

Details Pilot valve Pilot valve

2007-02-01

2010-02-02

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S025000

Reexamination Certificate

active

07654503

ABSTRACT:
A valve assembly is disclosed that includes a main valve, a pilot valve, and means providing fluid communication between the main valve and the pilot valve. The main valve includes an inlet, outlet, and means adapted to selectively open and close fluid flow between the inlet and the outlet. The pilot valve includes a housing having a first port, a second port, and a third port, and a piston disposed within the housing. The piston cooperates with the housing and the means providing fluid communication to selectively establish fluid communication between the first port of the pilot valve and one of the inlet and the outlet of the main valve.

REFERENCES:
patent: 2744719 (1956-05-01), McRae
patent: 4376444 (1983-03-01), Michael
patent: 4482127 (1984-11-01), Hafele
patent: 4615354 (1986-10-01), Bianchi
patent: 4715578 (1987-12-01), Seltzer
patent: 4981280 (1991-01-01), Brandenberg
patent: 5301919 (1994-04-01), May
patent: 5520366 (1996-05-01), Elliott
patent: 5927257 (1999-07-01), Hackett
patent: 6039071 (2000-03-01), Tomita et al.
patent: 6945507 (2005-09-01), Baarda et al.

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