Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1976-11-09
1979-01-02
Maslousky, Paul E.
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91420, 91443, 91447, 137599, 1376253, F15B 1522, F15B 13042
Patent
active
041321537
ABSTRACT:
A fluid power system including a fluid power cylinder having a piston and fluid ports at its opposite ends, a directional valve for selecting the direction of piston actuation, and a metering control valve coupled between the directional valve and the cylinder. The control valve includes a cylinder section having a control piston therein and a valve body connected to the cylinder section and having a valve spool-receiving cavity therein. The valve body has first and second fluid ports therein communicating with the cavity, one of the valve body ports being coupled to one of the power cylinder ports and the other being coupled to the directional valve. A valve spool is disposed in the valve body cavity operatively connected to the control piston and movable therewith, the spool having a passage therein. The spool passage communicates with the valve body ports and provides unrestricted fluid flow therebetween in a first spool position and substantially restricts fluid flow between the valve body ports in a second spool position, movement of the spool between its positions progressively metering the fluid flow between unrestricted and substantially restricted conditions. The spool passage is arranged so that with the spool in one of its positions fluid under pressure entering the passage from one of the valve body ports moves the spool and the control piston in one direction to the other position thereby providing the metering operation. The cylinder section has a port for admitting fluid under pressure thereto so as to move the control piston and spool in the direction opposite the one direction.
REFERENCES:
patent: 519436 (1894-05-01), Schweim
patent: 3304842 (1967-02-01), Shafer
patent: 3906991 (1975-09-01), Haussler
Boyer Peter W.
Grotness Gunnar
Maslousky Paul E.
PHD, Inc.
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