Closed-center controller and neutral bypass arrangement therefor

Details Closed-center controller and neutral bypass arrangement therefor Closed-center controller and neutral bypass arrangement therefor

1976-08-24

1978-06-27

Cohan, Alan

Fluid handling

Systems

Supply and exhaust

60384, 91467, 180132, 137339, 13762524, B62D 508

Patent

active

040968839

ABSTRACT:
A closed-center controller is disclosed, especially of the type utilized in hydrostatic power steering systems. The controller includes valving which, in the neutral position, defines a bypass passage communicating inlet fluid through the interior of the hollow, primary valve member to the tank port of the controller. The bypass passage includes a variable bypass orifice having a maximum flow area in the neutral position of the valving and decreasing to zero as the valving is displaced from the neutral position. The variable bypass orifice permits the passage of just enough fluid, typically in the range of about 0.25 gpm to about 0.5 gpm, to minimize the temperature difference between the controller valving and the remainder of the hydraulic system, thus minimizing the possibility of thermal seizure of the valving within the controller.

REFERENCES:
patent: RE25126 (1962-02-01), Charlson
patent: 2718903 (1955-09-01), Noon et al.

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