Fluid handling – Systems – Multi-way valve unit
Patent
1992-05-19
1993-10-05
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
251 65, 2511291, F15B 13044
Patent
active
052496031
ABSTRACT:
A proportional electrohydraulic pressure control device is disclosed. The device includes a linear motor having a permanent magnet. The magnet is radially magnetized providing first and second oppositely directed magnetic flux paths. A valve body is included which has a fluid supply port, first and second fluid control ports, and a central bore. The central bore defines first and second chambers at opposite ends of the bore. A linearly shiftable spool having first and second ends is disposed in the central bore. The first and second control ports define an annulus communicable with the central bore. A fluid source is communicable with the annulus of the control ports and supplies pressurized fluid to one of the first and second chambers. The fluid pressure in an associated chamber applies an axial force on a respective end of the spool. The spool is positional to a first neutral position causing a minimum fluid pressure at the first control port. Advantageously, the permanent magnetic flux forces are equal and opposite to the pressurized fluid force applied to the first end of the spool, thereby latching the spool at the first neutral position.
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Caterpillar Inc.
Masterson David M.
Michalsky Gerald A.
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