Dual concentric poppet valves for maintaining substantially cons

Details Dual concentric poppet valves for maintaining substantially cons Dual concentric poppet valves for maintaining substantially cons

1994-12-21

1998-11-24

Thorpe, Timothy S.

Power plants

Reaction motor

Condition responsive thrust varying means

60 3927, 239423, F02K 900

Patent

active

058392726

ABSTRACT:
A dual concentric poppet valve assembly (44) includes an assembled body (45) having an opening (55) therethrough and having a sealing surface (56) surrounding the opening. A first member (46) is mounted in the body opening for axial movement relative to the body. The first member has a first sealing surface (70) arranged to be moved toward and away from the body sealing surface (56) to define a first variable-area orifice (96) therebetween. The first member has a concentric opening (72) therethrough and has a second sealing surface (71) surrounding the first member opening. A second member (48) is mounted in the first member opening for co-axial movement relative to the first member. The second member has a sealing surface (83) arranged to be moved toward and away from the first member second sealing surface (71) to define a second variable-area orifice (98) therebetween. The device further includes an actuator (49) for selectively moving the first member relative to the body and for simultaneously moving the second member relative to the first member so that the ratio of the areas of the first and second orifices will remain substantially constant within an operating range of movement.

REFERENCES:
patent: 2643916 (1953-06-01), White et al.
patent: 2907529 (1959-10-01), Ghelfi
patent: 2933259 (1960-04-01), Raskin
patent: 3074231 (1963-01-01), Klein
patent: 3215352 (1965-11-01), Meraz, Jr.
patent: 3527056 (1970-09-01), Hoffman
patent: 3534909 (1970-10-01), Paine
patent: 3897008 (1975-07-01), Dettling et al.

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