Fluid handling – Systems – Supply and exhaust
Patent
1979-10-05
1981-09-22
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
91447, 91464, F15B 13043
Patent
active
042904471
ABSTRACT:
Disclosed is an electrohydraulic proportional valve comprising an electromagnetic force motor, a pilot actuator assembly, and a main spool and body assembly. The pilot actuator assembly comprises a pilot spool slidably received in a pilot sleeve and a feedback spool which has a camming surface against which the pilot sleeve rides. The camming surface comprises a first portion in which the position of the pilot sleeve is a function of the axial position of the camming surface and a second portion immediately adjacent the first portion in which the position of the pilot sleeve is constant regardless of the axial position of the camming surface.
The main spool and body assembly comprises a main spool connected to the pilot actuator assembly, first and second load holding check valves slidably disposed in a bore, first means for communicating pilot supply pressure to a reduced diameter area on the main spool when it is the float position, and second means for communicating pilot supply pressure from the reduced diameter area on the main spool to the bore between the first and second load holding check valves when the main spool is in its float position.
REFERENCES:
patent: 3381587 (1968-05-01), Parquet
patent: 3653409 (1972-04-01), Brannon
patent: 4011891 (1977-03-01), Knutson et al.
Byrne John J.
Dynex/Rivett Inc.
Michalsky Gerald A.
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