Fluid handling – Systems – Multi-way valve unit
Patent
1994-06-20
1996-02-27
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
91 38, 251 634, 92130R, F15B 13042, F15B 2110
Patent
active
054940753
ABSTRACT:
A hydraulic time delay valve includes a hydraulic timer valve having a valve pressure port, a valve return port, a valve cylinder port and a porting device for porting hydraulic fluid from the valve pressure port to the valve cylinder port. A cylinder is coupled to the timer valve and has a cylinder return port and an opening port at the bottom. A piston in the cylinder is axially movable from a depressed position in which the piston blocks the opening of the cylinder to an extended position in which the piston frees the opening. A control applies hydraulic fluid under pressure to the opening. The control includes a fluid restricting device for restricting fluid flowing to the opening. Thus, hydraulic fluid applied under pressure to the valve pressure port depresses the piston to its depressed position and hydraulic fluid applied under pressure via the control is restricted by the fluid restricting device for a period of time determined by a desired time delay. The hydraulic fluid then flows through the open port and extends the piston against the force of return hydraulic fluid supplied under pressure to the cylinder return port. After the lapse of the period of time, the piston activates the porting device, thereby causing hydraulic fluid to port from the valve pressure port to the valve cylinder port to provide high pressure hydraulic fluid flow to a hydraulic device coupled to the valve cylinder port.
REFERENCES:
patent: 2807238 (1957-09-01), Pilch
patent: 2922432 (1960-01-01), Huntinton et al.
patent: 2986368 (1961-05-01), Moore
patent: 3131722 (1964-05-01), Abbott et al.
patent: 3147671 (1964-09-01), Geyer
patent: 3253516 (1966-05-01), Huntington et al.
patent: 3543643 (1970-12-01), Southwell
patent: 3896852 (1975-07-01), Holmes
Anderson Terry J.
Hoch Jr. Karl J.
Michalsky Gerald A.
Northrop Grumman Corporation
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