Blocking and thermal relief valve

Details Blocking and thermal relief valve Blocking and thermal relief valve

1981-10-22

1984-02-28

Schwadron, Martin P.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

137508, 137106, 1375962, F15B 13042

Patent

active

044336152

ABSTRACT:
A combination hydraulic lock and pressure relief valve for use in an actuator system for operating a spoiler control surface is interposed between the retract side of the actuating piston and the servo valve controlling the piston. In this valve a poppet urged closed against a seat member by means of a light spring aided by the fluid pressure in the retract chamber of the piston holds the poppet closed whenever the system is shut down. A piston exposed to supply pressure carries a spring retainer which includes an elongated rod movable to dislodge the poppet from its seat to permit fluid to move toward and from the retract side of the piston during normal operation of the spoiler. A second retainer abuts against the seat and a heavy spring is interposed between the spring retainers. The seat member is loaded by the heavy spring to a predetermined level above normal system pressure. Differential operating areas are chosen such that when fluid pressure in the retract chamber increases to exceed the predetermined level this pressure, operating against the seat, causes the seat to move away from the poppet, thus relieving the overpressure condition.

REFERENCES:
patent: 2845088 (1958-07-01), Crausman et al.
patent: 3098443 (1963-07-01), Spencer
patent: 3450155 (1969-06-01), Froehner et al.
patent: 3792715 (1974-02-01), Parrett et al.
patent: 3993361 (1976-11-01), Stelzer

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