Pneumatically controlled, four position hydraulic valve

Details Pneumatically controlled, four position hydraulic valve Pneumatically controlled, four position hydraulic valve

1980-04-15

1982-10-26

Nilson, Robert G.

Fluid handling

Systems

Multi-way valve unit

91464, 13762566, 251297, F16K 1107

Patent

active

043556604

ABSTRACT:
A four position hydraulic valve having a first power, a hold, a float, and a second power position is adapted for pneumatic control by enclosing the ends of the power spool in pneumatic chambers. A three position pneumatic valve having its two output ports connected respectively to the pneumatic chambers, drives the power spool from the hold position to either power position and from the float position to the hold position. A detent retains the powers spool in the float position after a second power position and a centering spring biases the power spool toward the hold position from either power position and the float position.

REFERENCES:
patent: 2831466 (1958-04-01), Stueland
patent: 3106135 (1963-10-01), McAfee, Jr. et al.
patent: 3120858 (1964-02-01), Markovich
patent: 3160174 (1964-12-01), Schmiel et al.
patent: 3346012 (1967-10-01), Williams
patent: 3641876 (1972-02-01), Wienke
patent: 3866880 (1975-02-01), Schexnayder
patent: 3939870 (1976-02-01), Giugliano
patent: 4154262 (1979-05-01), Blume et al.
patent: 4182534 (1980-01-01), Snyder

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