Combination valve including improved neutral valve for use in hy

Details Combination valve including improved neutral valve for use in hy Combination valve including improved neutral valve for use in hy

1999-01-04

2000-06-13

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60468, 91468, 137110, F16D 3102

Patent

active

060734442

ABSTRACT:
A valve mechanism for use in a hydrostatic transmission including a closed porting system for hydraulic fluid and a sump is provided. The valve mechanism includes a valve body mounted to the hydrostatic transmission whereby the valve body is open to the closed porting system at one end thereof and open to the sump at the other end thereof. The valve body has a first open position whereby hydraulic fluid is pulled into the closed system from the sump when the pressure of the fluid in the closed system is below a first pressure, a second open position whereby hydraulic fluid exists the closed system to the sump when the pressure of the fluid is at a second pressure higher than the first pressure, and a closed position when the pressure of the hydraulic fluid in the closed system is at a third pressure higher than the second pressure.

REFERENCES:
patent: 4891943 (1990-01-01), Okada
patent: 4905472 (1990-03-01), Okada
patent: 4936095 (1990-06-01), Ross et al.
patent: 5031403 (1991-07-01), Okada
patent: 5356347 (1994-10-01), Komura et al.
patent: 5546752 (1996-08-01), Horton et al.
patent: 5855116 (1999-01-01), Horton et al.

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