Pilot operated valve

Details Pilot operated valve Pilot operated valve

1985-05-13

1987-06-02

Scott, Samuel

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 612, 13762566, F16K 3112

Patent

active

046697004

ABSTRACT:
To minimize friction losses and hysteresis losses while providing convenient adjustability without alignment problems in a pilot operated valve, a poppet is disposed between two ports in a valve body and is biased by means of a spaced diaphragm assembly. The poppet is axially positionable in the body in a nearly zero lapped position relative to the first and second ports. In cooperation with the diaphragm assembly, fluid pressure signals delivered to three separate chambers are utilized to control valve opening ramp rate, pressure variations within the limit of a set point, and adjustability of the set point.

REFERENCES:
patent: 2013766 (1935-09-01), Sandvoss
patent: 2965128 (1960-12-01), Silver
patent: 3366315 (1968-01-01), Alberani
patent: 3367367 (1968-02-01), Moriyama et al.
patent: 3435626 (1969-04-01), Wile et al.
patent: 3572359 (1971-03-01), Weise
patent: 3769998 (1973-11-01), Avant
patent: 4226258 (1980-10-01), Nakanishi
patent: 4238109 (1980-12-01), Powers
patent: 4269028 (1981-05-01), Hattori
patent: 4497335 (1985-02-01), Masuda

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