Hydrostatic transmission bleed-off valve

Details Hydrostatic transmission bleed-off valve Hydrostatic transmission bleed-off valve

1979-12-03

1982-06-01

Cline, William R.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60488, 137115, F16K 3112

Patent

active

043321348

ABSTRACT:
A valve to provide a controlled loss of hydraulic fluid from a closed loop hydrostatic transmission. A method of converting a bleed-off valve from one sensitive only to loop pressure to one sensitive to both loop pressure and charging line pressure. A pressure sensitive surface in flow communication with charging line pressure is used to position the valve to shut off flow in the event that charging line pressure is lost. In the event that charging line pressure and loop pressure are normal the valve provides a controlled bleed of hydraulic fluid. Finally, in the event that loop pressure becomes unacceptably high, flow is shut off.

REFERENCES:
patent: 3230699 (1966-01-01), Hann et al.
patent: 3583157 (1971-06-01), Adams et al.
patent: 3866421 (1975-02-01), Kersten et al.
patent: 4189921 (1980-02-01), Knapp
patent: 4209988 (1980-07-01), Langworthy et al.

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