Directional control valve

Details Directional control valve Directional control valve

1989-03-20

1990-04-03

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91438, F15B 1304

Patent

active

049131915

ABSTRACT:
A four way directional control valve comprises a valve body having a sleeve formed therein, a spool slidable in the sleeve, two output ports, two pump ports and a tank port formed in the valve body so that the output ports can be a pressure side and an exhaust side by operation of the spool. The four way directional valve further comprises a communicating passage formed in the valve body to provide communication of the output ports with each other, a fixed orifice disposed in the communicating passage, a control passage, formed in parallel with the communicating passage, a control spool disposed in the control passage movable in response to a differential pressure between the output ports to block the communicating passage.

REFERENCES:
patent: 2362349 (1944-11-01), Bryant
patent: 3020008 (1962-02-01), Rumsey
patent: 3138072 (1964-06-01), Gray
patent: 3403601 (1968-10-01), Eddy

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