Cla-Val 350-01/3650-01 - Manual (Page 5)

Typical Applications
Schematic Diagram
Item Description
1 Hytrol (Main Valve)
2 X42N-2 Strainer & Needle Valve
3 CRL-30 Electronic Pressure Sustaining Control
Optional Features
Item Description
B CK2 (Isolation Valve)
D Check Valves with Isolation Valve
F Remote Pilot Sensing
H Drain to Atmosphere
P X141 Pressure Gauge
S CV Flow Control (Opening)
V X101 Valve Position Indicator
• Simplified Interfacing with SCADA Systems
• Accepts Local or Remote Set-Point
• Integral Loop Power Supply
• Accurate Pressure Control
• Reliable Hydraulic Operation
• Rugged Durable Design
The Cla-Val Model 350-01/3650-01 Electronic Actuated Pressure Sustaining
Control Valve combines the precise control of field proven Cla-Val hydraulic
pilots and the convenience and versatility of remote Set-Point control. The
Model 350-01/3650-01 control valve is a hydraulically operated, pilot controlled,
modulating valve designed to maintain constant upstream pressure within
close limits. This valve can be used for pressure sustaining, back pressure,
or unloading functions in a by-pass system. The pilot control, consisting of a
hydraulic pilot and integral controller, accepts a Set-Point and compares it
with a pressure or internal potentiometer signal and makes incremental
adjustments to modulate the valve to a Set-Point.
Adjustable solid state limit switches eliminate over ranging. In the event of a
power or transmitter failure, the CRL-30 pilot remains in hydraulic control
virtually assuring system stability under changing conditions. If check
feature ("D") is added, and pressure reversal occurs, the valve closes to
prevent return flow.
Electronic Actuated
Pressure Sustaining Control Valve
RTU
Area Of Demand
Remote Set Point
Remote Telemetry Unit
(Customer Supplied) Upper Zone
Process
Variable
Upstream
Pressure
CLA-VAL
350-01/3650-01
Electronic Actuated
Pressure Sustaining Valve
SCADA
Computer
F
D1
B1
2
S
B1 D2
D3
B2
3
1
INLET OUTLET
H
DRAIN TO
ATMOSPHERE
Remote Sensing
The valve is designed to be used with supervisory control systems having
a isolated remote analog Set-Point output and a process variable
upstream pressure input. When installed in a line between an upper zone
and a lower area of demand, the valve acts to maintain desired upstream
pressure to prevent "robbing" of the upper zone. Water in excess of pressure
setting flows to area of demand, control is smooth, and pressure regula-
tion is positive.
It is also an effective solution for lowering costs associated with "confined
space" requirements by eliminating need for entry into valve structure for
Set-Point adjustments and system information.
Additional Pilot Controls, hydraulic and/or electronic, can be easily added
to perform multiple control functions to fit exact system requirements.
350-01
MODEL
(Full Internal Port)
3650-01
(Reduced Internal Port)