Fluid handling – Systems – Multi-way valve unit
Patent
1977-05-27
1980-08-05
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762564, 13762566, F15B 13043
Patent
active
042157234
ABSTRACT:
A fluid pressure servo valve assembly driven by a pilot servo valve assembly and having a valve body formed therein with a cylindrical bore, input ports and output ports opening in the cylindrical bore, a spool valve member fitted in the cylindrical bore for axial reciprocatory movement and including axially spaced lands for connecting and disconnecting the input ports with the output ports as the spool valve member moves in axial reciprocatory movement in the cylindrical bore, a sealed annular space defined by an annular recess formed in the peripheral surface of the cylindrical bore of the valve body and an outer peripheral surface of one of the lands of the spool valve member, a piston member integrally connected to the outer periphery of the one of the lands of the spool valve member and extending radially outwardly therefrom into the annular space to divide the same into two pressure chambers, and passages for communicating the two pressure chambers with the pilot servo valve assembly. An actuating pressurized fluid is introduced alternately into one or the other of the two pressure chambers from the pilot servo valve assembly so as to cause the spool valve member connected to the piston member to move in axial reciprocatory movement in the cylindrical bore.
REFERENCES:
patent: 3434390 (1969-03-01), Weiss
patent: 3556154 (1971-01-01), Kramer
patent: 3736958 (1973-06-01), Rostad
patent: 3774641 (1973-11-01), Mindner et al.
patent: 3964518 (1976-06-01), Hesse et al.
patent: 4072087 (1978-02-01), Mueller
Ichiryu Ken
Matsuura Katsumasa
Nakamura Ichiro
Beall, Jr. Thomas E.
Hitachi , Ltd.
Michalsky Gerald A.
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