Pressure regulating and on-off valve

Details Pressure regulating and on-off valve Pressure regulating and on-off valve

1986-05-12

1987-05-26

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374895, 137490, G05D 1600

Patent

active

046676953

ABSTRACT:
A two stage relief valve, in which the pilot flow is limited by an active flow control element to a specific maximum predetermined level, to extend its maximum operating pressure range and to improve its operating characteristics. The downstream orifice may be fully open and of a fixed area type, or may be controlled by a spring or solenoid biased member. With the downstream orifice solenoid or stepper motor operated, the relief pressure level becomes responsive to an electrical input signal.

REFERENCES:
patent: 2309848 (1943-02-01), King
patent: 2747606 (1956-05-01), Adams et al.
patent: 3442485 (1969-05-01), Reynolds
patent: 3482588 (1969-12-01), Kreuter
patent: 3740174 (1973-10-01), Amtsberg
patent: 4314585 (1982-02-01), Nishimiya
patent: 4431020 (1984-02-01), Kowalski
patent: 4476893 (1984-10-01), Schwelm

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