CLA-VAL
CPC
Actuated Position Control 4-20 mA
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CLA-VAL
Europe
www.cla-val.ch
1
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LIN040DE
A 02/10
© Copyright CLA-VAL Europe - Specifications subject to change without notice - no contractual illustrations.
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Simple, Reliable and Accurate
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Key Points and Description
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Accurate 4-20 mA Position Control Actuator
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Pressure, Level or Flow Control
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Easy interfacing to SCADA 4-20 mA
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Submersible
(IP-68)
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Extended Electronic Protection
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Motor 24 VDC and powered with only 6 W!
The CLA-VAL CPC SERIES includes all valves with the Electronic
Position Actuator. CPC provides accurate remote 4-20 mA set-
point adjustments and can adjust pressure, flow or even reservoir
level by positioning the valve precisely and smoothly between the
fully closed and the fully open position.
Used for large water supply systems, transport pipelines or
industrial applications the CLA-VAL CPC position control is a
Hydraulic Actuator combined with Electronic « brushless » Motor
Technology.
The CPC Actuator adjusts valve operating
position by controlling its lift, using hydraulic
forces present in the main valve, it creates a
balance between inlet, outlet and cover
chamber pressure. Valve inlet water
pressure enters in the valve cover chamber
through a calibrated fixed orifice. Water flows
out of cover chamber to valve outlet through
the stem tube and a variable orifice as
illustrated in (Fig. 1). The variable orifice size
is adjusted only by the CPC orifice coupling
(coloured brown on Fig. 1) by the
«brushless» motor, inducing the opening or
the closing of the main valve. The single
positioning of the orifice coupling is
completely independent of the main valve
diaphragm assembly and will produce
identical positioning of the main valve
diaphragm assembly, regardless of the
system pressure.
As shown in (Fig. 1) there is no mechanical
link between the orifice coupling and the
valve stem, which are operating as a servo-
piston unit. Consequently the «brushless»
motor provides frictionless operation
together with a very low power consumption
of 6 W to move (at an adjustable speed) the
orifice coupling up or down to reach any
prescribed valve position, Security sensors
and loss signal mode are integrated in the
motor assembly.
Electronic “brushless” Motor Technology
Hydraulic Actuator
Security Sensor
Fig. 1
Variable
orifice
outlet
Orifice
coupling
Stem
tube
Valve
stem
Motor
shaft
Summary of Contents for CPC 138-01
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