Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2007-08-17
2010-12-14
Bastianelli, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C251S129060, C251S175000, C251S325000, C251S344000
Reexamination Certificate
active
07849876
ABSTRACT:
A valve assembly (10) comprising a valve member (14) having surfaces (70, 72, 74, 76, 78) radially sized and axially situated to provide an axial sealing force to insure leakfree operation. When the valve member (14) is in a supply position, the sum of fluid forces imposed on the radial surfaces is positive towards supply position, and, when the valve member (14) is a nonsupply position, the sum of fluid forces imposed on the radial surfaces is positive towards the nonsupply position. The valve assembly (10) is compatible with a piezo-type actuator (18) that provides lift-shift forces early in its stroke. Once movement of the valve member (14) has been initiated by the actuator (18), the fluid forces can be relied upon to complete the shift and seal the valve member (14) against the corresponding seat (40/42).
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Bastianelli John
Parker-Hannifin Corporation
Renner , Otto, Boisselle & Sklar, LLP
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