Fluid handling – Systems – Multi-way valve unit
Patent
1979-01-15
1980-12-23
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762569, 251324, 251DIG1, 277177, F15B 13042
Patent
active
042404673
ABSTRACT:
A valve assembly has an elongated body with an axial bore defining a valve seat, with axially apertured end caps sealed over opposite ends thereof and with the body having therein a series of pressure, cylinder and exhaust ports. A valve spool is reciprocally nested within said bore and at its ends is sealed and movably supported therein for controlling flow of pressure fluids through the respective ports. A coil spring is seated within one end cap and is biased against one end of the spool urging the spool to one control position. The other end cap is adapted for connection to a source of pressurized pilot air for moving the spool when energized to a second control position. The spool has an axial portion and a plurality of spaced, radially projecting valve seal supporting portions with a plurality of pairs of annular grooves formed in said supporting portion to define axial seal supports of predetermined length. An annular apertured flexible valve seal is loosely nested in each groove and loosely mounted upon the axial support, the base of such seal being of an axial width less than the length of said axial support. The valve seal has an annular rim portion of decreasing width towards its periphery, is transversely rounded at its outer edge and is of a diameter greater than said bore for flexing sealing engagement with the valve seat and to form a fluid tight contact with the bore. Rim portions of the seals are movable over the valve seat with a minimum of friction and the seal bases are adapted for a limited action movement on their axial supports for reducing resistance of the spool when reciprocated for its control movements. The spool is under size with respect to the bore so that O-ring seals adjacent its opposite ends loosely and supportably and sealingly mount the valve spool within the valve body as its sole support to provide a floating relationship of the spool within the valve body. The outer rim of each valve seal is of a relatively high Durometer, is less flexible and of sufficient hardness to reduce the frictional contact thereof with the valve seat. The base portion of each valve seal is of increased resiliency and lower Durometer for ease of flexibility and expansion upon its axial support.
REFERENCES:
patent: 2360734 (1944-10-01), Smith
patent: 2920650 (1960-01-01), Moog
patent: 3017901 (1962-01-01), Hicks
patent: 3212522 (1965-10-01), Williams
patent: 3515442 (1970-06-01), Munroe
patent: 3542073 (1970-11-01), Holbrook
patent: 3918726 (1975-11-01), Kramer
patent: 3985337 (1976-10-01), Gripe et al.
Blatt L. Douglas
Blatt Leland F.
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