Swing valve circuit

Details Swing valve circuit Swing valve circuit

1976-02-02

1977-12-27

Spar, Robert J.

91420, 91454, E02F 332

Patent

active

040650103

ABSTRACT:
Control for a swing mechanism having linear actuators such as hydraulic cylinders connected to the swing mechanism in a manner whereby the actuators work in unison with each other over a portion of the swing of the swing mechanism and in opposition to each other over another portion of the swing when imparting arcuate motion to the swing mechanism with the linear motion of the actuators. The control includes a pressure reducing-metering valve and a metering valve in each of two sets of lines which supply and return pressurized fluid to the actuators. The respective valves limit the pressure of fluid to one actuator while requiring a predetermined minimum actuation pressure to provide a more constant speed and torque characteristic for the swing mechanism. A check valve is placed in a line interconnecting the head end of one actuator and the rod end of the other actuator to prevent a regenerative effect occurring from interaction of the actuators, and pilot lines to the metering valves can be provided with orifice sets to damp the signal to the metering valves.

REFERENCES:
patent: 3033170 (1962-05-01), Norton et al.
patent: 3047171 (1962-07-01), Long
patent: 3795178 (1974-03-01), Roche
patent: 3922855 (1975-12-01), Bridwell et al.
patent: 3960286 (1976-06-01), Spooner et al.

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