Fluid handling – Systems – Multi-way valve unit
Patent
1986-04-04
1987-05-12
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
1374542, 13762569, F15B 1304
Patent
active
046641521
ABSTRACT:
A flow control valve includes an outer housing with a central bore in communication with pressure, return and working ports in the housing, and an inner cartridge subassembly disposed in the housing bore. The subassembly being slidably and sealably receivable within, and removable from, the housing bore is composed of concentrically-nested members arranged for relative movement to define fluid flow paths within the subassembly for connecting the pressure, return and working bores in selected ways. First, the subassembly has a hollow cylinder and a by-pass sleeve press fitted within the cylinder with both adapted to be disposed in a stationary position within the outer housing. Also, a hollow valve spool plugged at its opposite ends to define an interior flow cavity is slidably received within the by-pass sleeve and axially movable to change the fluid flow paths between the housing ports. Finally, the spool includes a self-centering mechanism which is self-contained therein and engaged with the by-pass sleeve and cartridge cylinder such that upon axial movement of the spool in either direction away from a center position the centering mechanism moves therewith and is thereby actuated to return the spool to the center position.
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Marzocco Ralph L.
Michalsky Gerald A.
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