Proportional action valve with a biased spring unproportionately variable to the load pressure
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United States of America Patent
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-
Jan 3, 1989
Grant Date -
N/A
app pub date -
Oct 22, 1986
filing date -
Feb 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic proportional action valve apparatus includes a throttle valve, and a pressure balance which permits adjustment of the pressure difference between a supply pressure and a consumer pressure. The pressure balance, which may be provided with a spring, is hydraulically supported. A supporting assembly, which is provided for this purpose, is biased by a constantly controllable pressure-regulating valve. The control of the pressure-regulating valve may occur as a function of hydraulic parameter, such as, for example, the load pressure or the pilot pressure of the throttle valve.
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