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Simplified Remote Valve Set-Point Control
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12-24VDC Input Power
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Easy Interfacing to SCADA Systems
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Accurate Flow Rate Control
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Reliable Hydraulic Operation
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Submersible (IP-68)
The Cla-Val Model CDHS-32 Electronic Actuated Differential Pressure Pilot
Control provides remote set-point adjustment and accurate differential pres-
sure control for rate of flow control on Cla-Val 340 Series Control Valves.
Remote set-point command signals can be from any SCADA-type control
system that uses analog 4-20 mA signals. A precision orifice plate installed
with the valve creates differential pressure used for rate of flow control by
the CDHS-32. Operating on 12 to 24 VDC and consuming very little power,
it is an ideal control system for remote valve sites that may even be solar
powered. Existing manually-set Cla-Val 40 Series Rate-of-Flow control
valves can be retrofitted with CDHS-32 to add remote set-point control.
Verification of differential pressure and corresponding flow rate may be sent
to SCADA system from customer supplied differential pressure sensor
attached to orifice plate.
The CDHS-32 consists of a hydraulic pilot and integral controller that
accepts a 4-20 mA remote set-point and positions the pilot to maintain a
maximum pressure differential at orifice plate and corresponding flow rate
within preset limits. Pressure differential settings are linear between these
settings. Special USB connector cable and free downloadable software is
required to change built-in electronic range limits for differential pressure
and corresponding flow rate. Continuous internal monitoring of actuator
position results in smooth transitions between pilot set-points with no back-
lash or dithering. When power or control input fail, the CDHS-32 pilot
remains in automatic hydraulic control assuring system stability under all
conditions.
Electronic Actuated
Rate of Flow Pilot Control
Remote
Set-Point
SCADA
Computer
Remote Telemetry Unit
(Customer Supplied)
Standard Flow Sensing
Orifice Plate Assembly
and Optional
Customer Supplied
Transmitter
CLA-VAL
340 Series
Electronic Actuated
Rate of Flow Valve
with CDHS-32 Pilot Control
Flow
CLA-VAL
CDHS-32
Control
Typical Applications
The CDHS-32 Is installed on Cla-Val 340 Series valves that maintain
flow rate and require this flow to be changed from a remote location. It
is also an effective solution for lowering costs associated with "confined
space" requirements by eliminating the need for entry in valve structure
for set-point adjustment. Additional pilot controls, hydraulic and/or elec-
tronic, are also available to perform multiple functions to fit exact system
requirements.
CDHS-32
MODELS
CLA-VAL
