Control device for a hydraulically operated load

Details Control device for a hydraulically operated load Control device for a hydraulically operated load

1978-12-13

1982-04-20

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91451, F15B 1304, F15B 1308

Patent

active

043254101

ABSTRACT:
The control device for a hydraulically operated load includes a multiway piston valve defining a plurality of working chambers, a plurality of control chambers, a piston having axial and radial bores acting as first choke channels and a control collar cooperating with the control chambers to act as additional choke channels, a piston manometer valve biased by a spring and connected between a pump channel and a return flow channel. A control conduit including at least one choke is connectable via additional choke channels between the pump channel and the return flow channel and has a branch conduit leading to the spring-biased end of the manometer piston. The valve piston is displaceable from its neutral position into an intermediate control position in which in the range of the fine adjustment of the flow the pressure from the load is applied through the control conduit to the manometer piston to provide a load compensated control. In the end control position of the multiway piston the load compensated control is disconnected and maximum through-flow is attained.

REFERENCES:
patent: 3815477 (1974-06-01), Ailshie et al.
patent: 3924655 (1975-12-01), Schwerin

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