Control valve

Patent · Tue Jan 26 04:00:00 EST 1988

OSTI ID:5340446

Gunter, W C

This patent describes a control valve for controlling a reversible winch motor and winch brake, the winch motor having first and second ports, entry of a pressurized fluid in the first port while permitting fluid to drain from the second port rotating the winch motor in a first direction to raise a load, entry of a pressurized fluid in the second port while permitting fluid to drain from the first port rotating the winch motor in the opposite direction to lower a load, the winch motor being operated by a three position operating valve, the neutral position of the operating valve draining raise and lower lines, the raise position of the operating valve providing pressurized fluid to the raise line and draining the lower line, the lower position of the operating valve providing pressurized fluid to the lower line and draining the raise line; and the winch brake being releasable by entry of pressurized fluid into a brake release chamber communicating hydraulically with the control valve. The control valve comprising: a valve body defining a cylindrical valve chamber centered on a first axis, the cylindrical valve chamber opening into a first spring chamber at a first end of the valve chamber and opening into a second spring chamber at the opposite end of the valve chamber; a cylindrical valve spool slidable along the cylindrical valve chamber; first spring means for progressively resisting movement of the valve spool into the first spring chamber; second spring means for progressively resisting movement of the valve spool into the second spring chamber; the raise and lower lines and first and second ports each individually being hydraulically connected with a recess formed into the valve body through the surface of the cylindrical valve chamber, the recesses being spaced along the length of the cylindrical valve chamber along the fist axis.

• Assignee: Ramsey Winch Co., Tulsa, OK
• Patent Number(s): US 4720975
• OSTI ID: 5340446
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
BRAKES
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FIELD PRODUCTION EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
FLUIDS
HYDRAULIC FLUIDS
HYDRAULICS
MACHINE PARTS
MATERIALS HANDLING EQUIPMENT
MECHANICS
NATURAL GAS WELLS
OIL WELLS
OPERATION
VALVES
WELLS
WINCHES
WORKING FLUIDS