Cla-Val CRL-33 - Manual

2.00"
6.50"
6.18"
3.94"
• Simplified Remote Valve Set-Point Control
• 12-24VDC Input Power
• Isolated Input
• Reverse Polarity Protection
• Reliable Hydraulic Operation
• IP-68 Submersible
The Cla-Val Model CRL-33 Electronic Actuated Pressure Sustaining Pilot
Control provides remote set-point adjustment and accurate pressure sus-
taining control on Cla-Val 350 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 CRL-33 senses upstream pressure with a remote hydraulic connec-
tion. 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 pow-
ered. Existing manually-set Cla-Val 50 Series Pressure Sustaining control
valves can be retrofitted with CRL-33 to add remote set-point control of
minimum inlet pressure. Verification of inlet pressure may be sent to
SCADA system from customer supplied pressure sensor attached
upstream of valve.
The CRL-33 consists of a hydraulic pilot and integral controller that
accepts a 4-20 mA remote set-point and positions the pilot to maintain a
minimum pressure at valve inlet within preset limits. Pressure settings are
linear between these settings. Pressure settings are calibrated to the spe-
cific 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 CRL-33 pilot remains in automatic hydraulic
control assuring system stability under all conditions.
Electronic Actuated
Pressure Sustaining Pilot Control
CRL-33
MODEL
The CRL-33 is installed on Cla-Val 350 Series valves that main-
tain minimum upstream pressure by relieving excess pressure
to lower zone and require this pressure setting to be changed
from a remote location. It is also an effective solution for lower-
ing costs associated with "confined space" requirements by
eliminating the need for entry in valve structure for set point
adjustment. 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 system requirements.
Remote
Set-Point
SCADA
Computer
Remote Telemetry Unit
(Customer Supplied)
Optional
Process Variable
Transmitter of
Upstream Pressure
(Customer Supplied)
Upper
Zone
CLA-VAL
350 Series
Electronic Actuated
Pressure Sustaining Valve
with CRL-33 Pilot Control
Flow
CLA-VAL
CRL-33
Control
Lower Zone
Typical Applications