Hydraulic speed control and braking apparatus for draw works

Details Hydraulic speed control and braking apparatus for draw works Hydraulic speed control and braking apparatus for draw works

1985-01-23

1986-09-09

Michalsky, Gerald A.

Power plants

Pressure fluid source and motor

Methods of operation

60486, F15B 1500

Patent

active

046101390

ABSTRACT:
A winch apparatus, such as draw works used for raising and lowering drill pipe into a borehole, in which motive power is provided by a hydraulic motor. A multi-stage rotary disk valve is interposed between the fluid supply pump and the hydraulic motor to provide a variable fluid flow rate and thereby to provide means for variably controlling the speed and direction of rotation of the draw works. A directional control disk is provided in the valve to provide reverse flow to prevent cavitation when the drill pipe is in free fall into the borehole, which drives the hydraulic motor in reverse. The directional control disk also controls the entry into the reverse flow of additional fluid provided by a high volume, low pressure auxiliary pump.

REFERENCES:
patent: 4219049 (1980-08-01), Skelly
patent: 4330008 (1982-05-01), Skelly
patent: 4448215 (1984-05-01), Skelly

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