Hydraulic valve assembly

Details Hydraulic valve assembly Hydraulic valve assembly

1995-09-14

1996-11-26

Nguyen, Hoang

Motors: expansible chamber type

Relatively movable working members with one having motive...

Single valve unit controlling plural working chambers

91536, F01L 1500, F15B 1100

Patent

active

055774342

ABSTRACT:
A hydraulic valve assembly configured for controlling the elevation and operation of a mowing deck of a power mower. The valve assembly includes a housing having a valve spool positionable in four positions, a cylinder activation position, a neutral position, a cylinder relief and motor start position, and a motor run position. In the cylinder activation position pump pressure is connected to a deck raising cylinder. In the neutral position, a status quo is maintained, and pump is vented to tank. In the cylinder relief and motor start position, the mowing deck, if elevated, is lowered under its own weight by relieving pressure on the deck cylinder, and the mowing motor is started in operation under low pressure. In the motor run position, the motor is connected to high pressure, and the deck cylinder continues to be vented to tank.

REFERENCES:
patent: 2853891 (1958-09-01), Tuck
patent: 3986434 (1976-10-01), Kohler
patent: 4004779 (1977-01-01), Flesburg
patent: 4037743 (1977-07-01), Pedersen
patent: 4319609 (1982-03-01), Debrus

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