Fluid handling – Systems – Supply and exhaust
Patent
1976-07-06
1978-02-07
Nilson, Robert G.
Fluid handling
Systems
Supply and exhaust
91461, 13762564, F15B 13043, F16K 1107
Patent
active
040721698
ABSTRACT:
A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.
REFERENCES:
patent: 3176954 (1965-04-01), Cameron
patent: 3556154 (1971-01-01), Kramer
patent: 3628567 (1971-12-01), Bender
patent: 3744374 (1973-07-01), Schneider
patent: 3768375 (1973-10-01), Flaschar
Braunlinger Konrad
Flaschar Heinz
Gand Heinz
Heiser Joachim
Hoheisel Rainer
Nilson Robert G.
Robert & Bosch GmbH
Striker Michael J.
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