Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1977-08-22
1980-04-01
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251141, F16K 3102
Patent
active
041958110
ABSTRACT:
A valve which is normally biased in a first operative position is provided with control means including a first pressure fluid orifice for directing such fluid to a control member for changing the operative position of the valve. The device further includes a housing which communicates with said first orifice and which has a bleed orifice assembly having a second or bleed orifice. The bleed orifice assembly further includes a bleeder valve seat and a piezoelectric crystal mounted adjacent thereto so that upon bending of the crystal, as by energization thereof, pressure contact is made with an intermediate valve element. The valve element is in turn adapted to move against the bleeder valve seat to close the same. When the bleed orifice assembly is closed in the manner above described, pressure is permitted to build up in the first orifice to activate the valve.
REFERENCES:
patent: 2651326 (1953-09-01), Ray
patent: 3029743 (1962-04-01), Johns
patent: 3038500 (1962-06-01), Lansky et al.
patent: 3152612 (1964-10-01), Avery
patent: 3524474 (1970-08-01), McCormick
patent: 3934816 (1976-01-01), Terrell et al.
patent: 3981480 (1976-09-01), Eernisse et al.
Corrado Anthony P.
Marchese Vincent P.
Morici Frank S.
Timte Frank W.
EMX Controls Inc.
Schwadron Martin P.
Walton G. L.
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