Combination pressure control selector valve

F - Mech Eng,Light,Heat,Weapons – 15 – B

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138/47, 137/88

F15B 13/00 (2006.01) F16D 48/02 (2006.01) F16D 48/04 (2006.01) F16K 11/07 (2006.01) F16H 59/08 (2006.01) F16H 61/02 (2006.01)

Patent

CA 1039618

ABSTRACT A manually operated clutch valve adapted for use with a forward-reverse clutch provides modulated flow by use of a combination of linearly tapered metering slots and passages on the valve spool lands. The valve provides for linear pressure rise for proportionate lever movement in addition to the capability of selection of forward or reverse clutch engagement. Linear pressure rise occurs until about 90% of the maximum spool travel has been achieved at which point the full flow is abruptly provided to produce engagement of the clutch and thereby prevent a stick slip clutch condition.

256843

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