Header height valve

Details Header height valve Header height valve

1979-03-12

1981-08-18

Moore, Chris K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

F15B 1108, F15B 1304

Patent

active

042839963

ABSTRACT:
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 operating position has a plateau at a time interval from zero which is substantially equal to one-half of the cycle time of the natural frequency of the machine.

REFERENCES:
patent: 3049101 (1962-08-01), Ruhl
patent: 3198088 (1965-08-01), Johnson et al.
patent: 3272085 (1966-09-01), Hajma
patent: 3410306 (1968-11-01), Malott
patent: 3508847 (1970-04-01), Martin
patent: 3980000 (1976-09-01), Iijima et al.
patent: 4180908 (1979-12-01), Budzich

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