F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/99
F15B 13/044 (2006.01)
Patent
CA 1145646
ELECTROHYDRAULIC PROPORTIONAL VALVE Abstract of the Disclosure 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 which it is in 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.
361657
Dynex/rivett Inc.
Smart & Biggar
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