Fluid handling – Systems – Multi-way valve unit
Patent
1986-04-03
1986-12-02
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
1376256, 251 634, F15B 13042
Patent
active
046257640
ABSTRACT:
Disclosed is a relay valve having a valve body with a longitudinal bore having axially spaced apart along its length and extending into the valve bore an inlet, and outlet, an exhaust, and a pilot inlet. A valve stem is slidingly mounted in the valve bore and is movable between a first position in which the inlet is in communication with the outlet and communication from the outlet to the exhaust is blocked, and a second position in which the outlet is in communication with the exhaust and communication from the inlet to the outlet is blocked. A piston is slidingly mounted in the valve bore and is movable with respect to the valve stem. The piston has a longitudinal piston bore and a piston spring is provided for urging the piston toward a closed end of the valve bore. A spool is connected to the stem and is slidingly positioned in the piston bore. The spool is movable with respect to the piston between an open position in which a chamber defined between the piston and the closed end of the bore is in communication with the exhaust and a closed position in which communication between the chamber and the exhaust is blocked and the pilot inlet is in communication with the chamber. A spool spring is provided for urging the spool toward the open position.
REFERENCES:
patent: Re31845 (1985-03-01), Peters
patent: 3877484 (1975-04-01), Theriot et al.
patent: 4073466 (1978-02-01), Snyder
patent: 4145025 (1979-03-01), Bergeron
patent: 4239058 (1980-12-01), Peters
patent: 4320779 (1982-03-01), Peters
patent: 4355658 (1982-10-01), Snyder
patent: 4364412 (1982-12-01), Peters
Gundel Norman L.
Snyder David E.
Axelson, Inc.
Michalsky Gerald A.
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