Header height valve

Details Header height valve Header height valve

F - Mech Eng,Light,Heat,Weapons

15

B

51/116, 138/79.1

F15B 13/042 (2006.01) A01D 41/14 (2006.01) F15B 13/01 (2006.01) F15B 13/04 (2006.01)

Patent

CA 1122881

ABSTRACT OF THE DISCLOSURE A hydraulic valve in a load responsive pressure flow compensated system for operating a header height cylinder including a lockout check valve which is opened by an accompanying plunger experiencing pressure in an adjacent motor port. Said plunger includes a metering notch opening to drain when the plunger is actuated, said metering notch is sized larger than the flow-sensing notch on the valve spool so that while lowering the machine header, the pressure compensating means of the system does not go to full pressure compensation level but rather stands by at the low pressure level relieved across the lockout actuating plunger. The valve further includes metering notches in the control valve spool which are so shaped that a FLOW vs. TIME curve of the spool from the neutral position to an opening position has a plateau at as time interval from zero which is substantially equal to one-half of the cycle time of the natural frequency of the machine.

339806

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