Position-controlled proportional directional valve
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United States of America Patent
Stats
-
Sep 8, 1992
Grant Date -
N/A
app pub date -
Dec 3, 1990
filing date -
Dec 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The main control piston (8) is controlled hydraulically by pilot control slide valves, operated in each case via two control magnets (4, 6) with force build-up proportional to the control current. In the case of failure of the electrical activation, the valve is always positioned in the center position by pressure centering and in the case of failure of the pilot control pressure it is positioned in the center position by spring centering.
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