Pressure relief valves

Details Pressure relief valves Pressure relief valves

1985-02-14

1986-10-28

Garrett, Robert E.

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91459, F15B 1110

Patent

active

046191860

ABSTRACT:
A pilot operated relief valve has a main relief valve (10) and a pilot relief valve (31) connected between a control chamber (23) and drain. A restriction (16) connects the control chamber (23) to the inlet chamber (22) which is separated from the control chamber by a piston (24) integral with the main relief valve closure member (12). Thus opening of the pilot relief valve against the adjustable force of a spring (14) determines the maximum pressure in the inlet chamber (22). The control chamber (23) can also be connected to drain (70) by a pilot valve (19) which is operated by a force motor (52) against pressure in a feedback chamber (56) connected to the inlet passage (22). The energization of the force motor (52) can be adjusted to adjust the relief pressure to a value below that at which the pilot relief valve (31) opens. Alternatively the pressure in the feedback chamber (56) can depend on the pressure at at least one side of a load fed via a directional valve from the inlet passage (22).

REFERENCES:
patent: 3180355 (1965-04-01), Long
patent: 3294104 (1966-12-01), Mercier
patent: 3613717 (1971-10-01), Smith
patent: 3698682 (1972-10-01), Berning et al.
patent: 3763746 (1973-10-01), Walters
patent: 3878765 (1975-04-01), Walters et al.

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