Cla-Val 138-01/638-01 - Manual (Page 23)

The Cla-Val CPC Electronic Actuated Positioning Control regulates
flow through Cla-Val Main Valves by changing valve position from full
open to shut-off. The CPC consists of electronic actuator and
hydraulic pilot sub-assembly. The CPC controls valve position by
hydraulically limiting valve opening with hydraulically-assisted pilot
modulating main valve.
The pilot sub-assembly has two calibrated orifices that are positioned
proportional to valve position to vary Cla-Val basic valve control cham-
ber operating pressure. The CPC actuator creates slight changes in
orifice position and in turn operating pressure hydraulically changes
valve position. The pilot sub-assembly requires very little torque and
is virtually frictionless for long service life. The actuator features high
repeatable-accuracy brush-less motor technology and low energy
consumption. Precision, no-contact hall-effect internal position sensor
assures durability. The CPC is factory pre-configured to full stroke,
preset rotation speed, and default setting on loss of set point. Actuator
parameters can be changed using free downloadable software and
special USB cable. Valve fully-closed position is assured by signaling
solenoid to lock control pressure in main valve operating chamber
when valve is very close to seat (adjustable). Operating on 24 VDC
and with customer supplied battery backup, the CPC can eliminate
downtime due to power failures.
Note: When retrofitting an existing valve, high capacity cover bearing
must be installed. This requires removing the valve cover. Consult
factory for details.
• Precise Valve Position Control
• Completely Self-contained
• High Energy Efficiency with Low Operation Friction
• Direct Control of Valve Opening and Closing
• Combines with Pressure, Flow or Level Control
• Ideal for SCADA Control
• Optional 133VF Valve-Mounted Flow Monitoring
Typical Applications The CPC Electronic Actuated Positioning Control is used with
138 Series Electronic Actuated Control Valves in high rise
building chill water circulating system applications. Building
SCADA control systems often use multiple circulating system
parameters to control valve position for optimizing water circu-
lating system. Also, 138 Series valves are used in large water
transmission systems where several system parameters must
be controlled by one valve. SCADA system monitors various
water distribution system parameters, such as downstream
pressure, upstream pressure, tank level, time of day, flow rates
in several zones, etc., and then remotely changes 138 Series
valve position to meet several system requirements as all
parameters continue changing.
Cla-Val 138 Series valves can have optional
133VF Flow Metering System installed for flow
rate monitoring. Consult factory for details.
Electronic Actuated Positioning Pilot Control
Model CPC