Fluid handling – Systems – Supply and exhaust
Patent
1978-10-30
1980-07-08
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
60466, 60469, 91443, 91446, 1375962, 137613, F15B 1304
Patent
active
042112540
ABSTRACT:
A fluid flow control valve assembly provides metering of the hydraulic fluid from a cylinder port at a constant desired rate for lowering a load at a corresponding constant rate which has been raised by the cylinder. The valve assembly comprises a normally closed valve having an input orifice communicating with the cylinder port and an output orifice and is selectively actuable for permitting the flow of fluid from the cylinder. A normally closed pressure compensating valve has an input orifice communicating with the normally closed valve output orifice, an output orifice, and a control input adapted for direct communication with the cylinder port for continuously sensing the fluid pressure within the cylinder. The pressure compensating valve maintains a constant fluid flow pressure differential and a constant fluid flow rate from the cylinder. A baffle restricts the rate of fluid flow from the normally closed valve to thereby cause the pressure compensating valve to gradually increase the fluid flow rate from the cylinder to a desired fluid flow rate and the compensating valve thereafter maintains the fluid flow rate constant responsive to the cylinder pressure sensed at the control input. The pressure compensating valve is maintained normally closed by the control input prior to the actuation of the normally closed valve.
REFERENCES:
patent: 2157707 (1939-05-01), Keel
patent: 2345973 (1944-04-01), Harrington
patent: 2570317 (1951-10-01), Busson
patent: 2570351 (1951-10-01), Klessig
patent: 2583296 (1952-01-01), Harrington
patent: 3376792 (1968-04-01), Clarke et al.
patent: 3882896 (1975-05-01), Budzich
Michalsky Gerald A.
Modular Controls Corporation
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