Cla-Val CRD-33 - Manual

2.00"
6.50"
6.18"
3.94"
• Ideal for Pressure Management
• Simplified Remote Valve Set-Point Control
• Isolated Input
• 12-24VDC Input Power
• Reverse Polarity Protection
• IP-68 Submersible
The Cla-Val Model CRD-33 and CRA-33 Electronic Actuated Pressure
Reducing Pilot Controls provide remote set-point adjustment and accurate
downstream pressure control on Cla-Val 390 Series Control Valves.
Remote set-point command signals can be from any SCADA-type control
system using an analog 4-20 mA signal or by contact closure for cc/ccw
rotation.
The CRD-33 senses valve outlet pressure directly and the CRA-33 sens-
es downstream pressure with remote hydraulic connection. Operating on
12 to 24 VDC and consuming very little power, they are an ideal control
system for remote valve sites that may even be solar powered. Existing
manually-set Cla-Val 90 Series Pressure Reducing control valves can be
retrofitted with CRD-33 or CRA-33 to add remote set-point control of deliv-
ery pressure. Verification of downstream pressure may be sent to SCADA
system from customer supplied pressure sensor attached to valve outlet.
The CRD-33 and CRA-33 consists of a hydraulic pilot and integral con-
troller that accepts a 4-20 mA remote set-point and positions the pilot to
maintain a pressure at valve outlet within preset limits. Pressure settings
are linear between these settings. Pressure settings are calibrated to the
specific spring range of the control. Special USB connector cable and free
downloadable software can be used to change this range if needed.
Continuous internal monitoring of actuator position results in smooth tran-
sitions between pilot set-points with no backlash or dithering. Should
power or control input fail, the CRD-33 or CRA-33 pilot remains in auto-
matic hydraulic control assuring system stability under all conditions.
Electronic Actuated
Pressure Reducing Pilot Control
Remote
Set-Point
SCADA
Computer
Remote Telemetry Unit
(Customer Supplied)
Optional
Process Variable Transmitter of
Lower Downstream Pressure
(Customer Supplied)
Higher Upstream
Pressure
CLA-VAL
390 Series
Electronic Actuated
Pressure Reducing Valve
with CRD-33 Pilot Control
Flow
CLA-VAL
CRD-33
Control
Typical Applications
The CRD-33 and CRA-33 are installed on Cla-Val 390 Series valves
that maintain downstream pressure and require this pressure to be
changed from a remote location. It can be an effective solution for low-
ering costs associated with "confined space" requirements by eliminat-
ing the need for entry in valve structure for set-point adjustment. It is
also ideal for pressure management, and can be programmed to mini-
mum night time and optimum daytime pressures. Optional profiler can be
used to create custom correlation between pressure and flow information.
Flow information can also be provided from the main valve, see E-133VF.
Additional pilot controls, hydraulic and/or electronic, are
also available to perform multiple functions to fit exact sys-
tem requirements.
CRD-33 and CRA-33
MODELS