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This document does not deal with valve
sizing. However, it should be recognized
that proper sizing will directly affect the
control of acceleration and deceleration.
Select the smallest valve size possible
and the smallest spool size within that
valve size. This results in pressure drop
through the valve that exceeds levels
traditionally experienced with on-off
solenoid valves. Smooth speed change
oltage into the amplifier. The greater
the current to the solenoid coil, the
greater will be the valve spool
displacement (travel) and oil flow
through the valve. By controlling the rate
the high shock with on-off solenoid
valves. A single proportional solenoid
valve can replace several conventional
how proportional valves work.
of current increase or decrease, the
spool displacement or valve opening
rate will increase or decrease resulting
in acceleration or deceleration control of
the hydraulic actuator and its working
load.transitions are obtained as compared to
This procedure may also be applied to
the EEA-PAM-5**-C-30 and partially to
the EEA-PAM-5**-B-30. Refer to Vickers
catalog GB-C-2007C for more ***ed
information on these power amplifiers.
This is an easy-to-use procedure for
anyone with a little understanding of
Proportional valve solenoids are current
controlled. This current is usually
regulated by varying the command
valves in a control system. Deceleration
valve, acceleration valve, flow controls
and solenoid switching valve functions
are all packaged in one proportional
valve envelope. Smaller manifolds and
fewer hydraulic interconnecting lines are
needed. Remote electric, programmable
signals to the amplifier controls all of the
above functions.

主要參數(shù)美國eaton比例閥放大版電