Fluid handling – Systems – Multi-way valve unit
Patent
1992-05-01
1993-03-30
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762564, F15B 13043
Patent
active
051975165
ABSTRACT:
A hydraulic servo valve arangement of the type having a hydraulic amplifier followed by a spool type servo valve second stage, includes a deceleration control mechanism. A spindle-type positioner has first and second positions which respectively permit and block flow of fluid from the first amplifier stage to the first end of the second stage spool. The hydraulic actuator urges the positioner into its first position, and a spring urges the positioner into a second or closed position in the event a failure mode is encountered. A solenoid valve has a communicating port coupled through a dropping orifice to a source of fluid supply and a second port coupled to drain, such that in an actuated condition, input port is at high pressure but in an unactuated condition the input port drops to low pressure. Relief channels and in fluid communication with the one end of the spool member have metered orifices to limit the flow of hydraulic fluid when the spool transits to its null position. Relief passages in communication with the positioner piston have respective transit and null override orifices which achieve smooth movement of the positioner to push the spool member to its set position.
REFERENCES:
patent: 3078863 (1963-11-01), Wolpin et al.
patent: 3221760 (1965-12-01), Buchanan
patent: 3228423 (1966-03-01), Moog, Jr.
patent: 3910314 (1975-03-01), Nicholson
patent: 4041983 (1977-08-01), Bianchetta
patent: 4046165 (1977-09-01), Rose et al.
patent: 4185660 (1980-01-01), Faix
patent: 4337797 (1982-04-01), Caruso
patent: 4456031 (1984-01-01), Taplin
patent: 4617966 (1986-03-01), Nicholson
Michalsky Gerald A.
Moog Controls Inc.
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