Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1985-07-18
1987-03-24
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91420, 91448, 91459, 91516, F15B 1108
Patent
active
046516247
ABSTRACT:
A hydraulic control arrangement for height regulation of an agricultural vehicle has a control valve with a control slider provided with a first piston portion with a control edge and a second piston portion with a throttle point. In the positions of neutral and lifting of the control slider the control edge blocks the communication from a control chamber to a working chamber which is connected with a spring chamber of a throttle valve. In the position of lifting the control edge opens and the pressure medium flows via the throttle point from the working chamber in the control chamber. Thereby the pressure in the spring chamber of the throttle valve is lifted. Therefore a lower neutral circulating pressure and a higher pressure level in the position of lifting is possible.
REFERENCES:
patent: 2778378 (1957-01-01), Presnell
patent: 3465519 (1969-09-01), McAlvay et al.
patent: 4344355 (1982-08-01), Schwerin
patent: 4475442 (1984-10-01), Breeden
Look Edward K.
Robert & Bosch GmbH
Striker Michael J.
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