Pilot valve

Details Pilot valve Pilot valve

1987-09-09

1988-12-06

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91404, 251 77, 251 634, F16K 31124

Patent

active

047891319

ABSTRACT:
A pilot valve assembly is provided which substantially eliminates stalling in air motors. The pilot valve assembly is located on one end over an air piston such that when the air piston hits the trip rod, the trip rod compresses a trip spring which is in turn compressed until the load of the force stored in this spring is sufficient to overcome the inlet air pressurizing the opposite side of the pilot valve and the main spring which also pre-loads the pilot valve. At this point, air is allowed to pass through the open pilot valve, allowing a spool valve to switch over and reverse the direction of the motor.

REFERENCES:
patent: 1373599 (1921-04-01), Clark
patent: 2476378 (1949-07-01), Majneri
patent: 2576554 (1951-11-01), Ashton
patent: 2653626 (1953-09-01), Finlayson
patent: 3029061 (1962-04-01), Hoxworth
patent: 3087510 (1963-04-01), Normand, Jr.
patent: 3170487 (1965-02-01), Julifs et al.
patent: 3219056 (1965-11-01), Dyson
patent: 3282294 (1966-11-01), Corniello
patent: 3385166 (1968-05-01), Kroffke
patent: 3874406 (1975-04-01), Von Loewis

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