Servovalve having fluidic actuator

Details Servovalve having fluidic actuator Servovalve having fluidic actuator

1979-05-25

1981-05-05

Maslousky, Paul E.

Motors: expansible chamber type

Jet control type

91 6, 91 24, 91359, 91459, F01B 2502, F15B 1522

Patent

active

042651620

ABSTRACT:
A fluidic driver amplifier for a servovalve has its controllably directed fluid jet differentially divided by a divider element which moves with a main valve piston in a manner to equalize the differential pressure received from the jet when the piston reaches the commanded position. In order to permit use of a small, low-leakage, fluidic driven amplifier, without the disadvantage of reduced speed of response, a derivative piston is linked to move with the main piston and displace fluid in a chamber containing a spring-centered secondary valve piston. When displaced, the secondary piston admits pressurized fluid into the main valve chamber in a positive feedback sense to aid the fluidic driver in positioning the main piston. The secondary piston is displaced only when the main piston is in motion and therefore has no effect once the main piston reaches the commanded position.

REFERENCES:
patent: 2917026 (1959-12-01), Hall et al.
patent: 3386343 (1968-06-01), Gray
patent: 3464318 (1969-09-01), Thayer et al.
patent: 3739689 (1973-06-01), Craven
patent: 3772962 (1973-11-01), Suzuki

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