Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1997-10-09
2000-01-25
Lee, Kevin
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 3004, 251 44, F16K 3112
Patent
active
060170158
ABSTRACT:
In a magnetically operated drain valve of an electrohydraulic lifting mod comprising a closing element which in the closing direction is assigned to a main valve seat, a pilot valve which is actuable by the magnet and arranged in a control chamber of the closing element, a throttle arranged upstream of the control chamber, and a closing member of the pilot valve which is adjustable by the magnet against a spring, the closing member being actuable by the magnet against the spring acting either in the closing adjustment direction or in the opening adjustment direction, a spring with a steep characteristic curve is used as the spring, and the closing element and the main valve seat form a lift-dependent flow-quantity adjusting device.
REFERENCES:
patent: 3977649 (1976-08-01), Zeuner et al.
patent: 5048790 (1991-09-01), Wells
patent: 5205531 (1993-04-01), Kolchinsky
patent: 5564673 (1996-10-01), Pieren
Heilmeier & Weinlein Data Sheet No. D 7490/1 (no translation).
Heilmeier & Weinlein Fabrik Fur Oel-Hydraulik GmbH & Co. KG
Lee Kevin
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