Cla-Val 350-07/3650-07 - Manual (Page 16)

• Simplified Remote Valve Set-Point Control
• 12-24VDC Input Power
• Easy Interfacing to SCADA Systems
• Accurate Pressure Control
• Reliable Hydraulic Operation
• Submersible (IP-68)
The Cla-Val Model CRL-32 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 that uses
analog 4-20 mA signals. The CRL-32 senses upstream pressure with a
remote hydraulic connection. 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 50 Series
Pressure Sustaining control valves can be retrofitted with CRL-32 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-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
minimum pressure at valve inlet within preset limits. Pressure settings are
linear between these settings. Special USB connector cable and free
downloadable software is required to change built-in electronic range lim-
its for upstream sustained pressure. Continuous internal monitoring of
actuator position results in smooth transitions between pilot set-points with
no backlash or dithering. When power or control input fail, the CRL-32
pilot remains in automatic hydraulic control assuring system stability under
all conditions.
Electronic Actuated
Pressure Sustaining Pilot Control
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-32 Pilot Control
Flow
CLA-VAL
CRL-32
Control
Lower Zone
Typical Applications
The CRL-32 is installed on Cla-Val 350 Series valves that maintain min-
imum 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 lowering costs associated with "con-
fined space" requirements by eliminating the need for entry in valve
structure for set point adjustment. Additional pilot controls, hydraulic
and/or electronic, are also available to perform multiple functions to fit
exact system requirements.
CRL-32
MODELS