Fluid handling – Systems – Multi-way valve unit
Patent
1994-11-10
1995-11-21
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
91 39, 91467, 13762413, 13762523, 13762524, F15B 13044
Patent
active
054678005
ABSTRACT:
A rotary servo valve includes a valve body having a longitudinal bore therethrough. A sleeve fits into the bore. The wall of the sleeve is perforated by two groups of port openings, each group includes a plurality of sets of radially-disposed ports. In each group, the central longitudinal axis of one set of ports is radially displaced from the central longitudinal axis of one other set of ports by a preselected angular displacement. At least a third set of ports in one group is in continuous fluid communication with a source of pressurized fluid; at least a third set of ports in the other group in continuous fluid communication with a return sump. A hollow rotary control member consists of two internal chambers. Each chamber includes a number of sets of apertures that are radially disposed around the walls of the chambers, spaced-apart by a preselected angular separation. A torque motor means is furnished to rotate the control member between two opposite angular positions with respect to a null position, thereby to apply power to cause a hydraulic actuator to operate in a desired manner.
REFERENCES:
patent: 2893357 (1959-07-01), Clarke
patent: 3810417 (1974-05-01), Sieke
patent: 4442755 (1984-04-01), Rozycki
patent: 4593719 (1986-06-01), Leonard
patent: 4977816 (1990-12-01), Kuttruf
patent: 5014748 (1991-05-01), Nogami et al.
Atlas Fluid Controls Inc.
Knox William A.
Michalsky Gerald A.
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