The flow control servovalves
D661 Highresponse Series are
throttle valves for 2-, 3- and 4-
way applications. These valves
are suitable for electrohydraulic
position, velocity, pressure or
force control systems including
those with high dynamic response
requirements.
The spool of the main stage is
driven by a jet pipe pilot stage in
an electrically closed loop.
Principle of operation
An electric command signal (flow
rate setpoint) is applied to the
integrated control amplifier which
drives the pilot stage. Thus the
deflected ServoJet highresponse
system produces a pressure
difference across the drive areas
of the spool and effects its
movement. The position transducer
which is supplied via an
oscillator measures the position
The integrated electronics of the
valve is a new development
featuring SMD technology and
requires 24 VDC power supply.
Operational features of the
ServoJet Highresponse pilot
stage
The ServoJet Highresponse pilot
stage consists mainly of torque
motor, jet pipe and receiver.
A current through the coil displaces
the jet pipe from neutral.
This displacement combined
with the special shape of the
nozzle directs a focussed fluid
jet more into one receiver
opening than the other. The jet
now produces a pressure difference
in the control ports.This
pressure difference results in a
pilot flow which in turn causes a
spool displacement. The pilot
stage drain is through the
annular area around the nozzle
to tank.
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