Valve for a hydraulic drive apparatus

Details Valve for a hydraulic drive apparatus Valve for a hydraulic drive apparatus

2006-12-12

2006-12-12

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C060S489000

Reexamination Certificate

active

07146809

ABSTRACT:
An improved valve for use in a hydrostatic drive apparatus for a vehicle such as a zero turn vehicle. For each hydraulic drive system in the vehicle, a valve is located between the high and low pressure sides of the closed hydraulic circuit connecting the hydraulic pump and motor. The valve opens when the pressure rise rate in the high pressure side reaches a set level to minimize pressure spikes in the high pressure side and thus improve performance of the vehicle. A valve block may be used to mount the valve, and a second valve may also be included therein to connect the two pressure sides of the hydraulic circuit in a similar manner when the vehicle is operated in reverse.

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