Closed center draft control valve

Details Closed center draft control valve Closed center draft control valve

1978-09-11

1980-01-22

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60484, 91461, 251122, F16H 3946

Patent

active

041843347

ABSTRACT:
A variable displacement pump supplies fluid to the single acting draft control cylinder of an agricultural tractor through a valve for controlling flow to and from the draft control cylinder. The valve houses a control rod activated valve spool that when displaced allows fluid to unseat a check valve between the spool valve and the draft control cylinder.
Fluid is exhausted from the draft control cylinder when the control rod causes unseating of a main poppet by unseating a pilot valve in the main poppet. Fluid being exhausted from the draft control cylinder then passes through the valve to tank.

REFERENCES:
patent: 2938346 (1960-05-01), Gratzmuller
patent: 3945208 (1976-03-01), O'Connor

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