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CL38 Regulator
ITRON / ACTARIS / SCHLUMBERGER / SPRAGUE CL38 GAS REGULATOR.
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Applications
Appropriate for commercial and industrial applications where very accurate pressure
control is required such as “fixed-factor” metering applications or large boiler
and furnace applications.
Description
The CL38 is a constant pressure loaded regulator for use where a closer pounds to
pounds regulation is desired than can be obtained from conventional spring loaded
regulators. Since, it requires an inlet pressure supply of only 1/2 PSIG above outlet
pressure, this unit can be used where demand type loading will not meet the low pressure
differential. The key feature of the CL38, compared to other CL series regulators,
is the large 2” valve body which is designed to handle the increased gas flows of the
larger orifice sizes.
Operating Temperature Range:
-20°F to 150°F
-29°C to 65°C
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Maximum Outlet Pressure: 30 PSIG
Weight -
NPT: 45 LB
Flanged: 65 LB
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Principle of Operation
(See Operating Schematic below)
Inlet pressure connected by tubing to the pilot regulator, is utilized as supply
pressure for pilot. Outlet pressure of the Pilot Regulator is applied to top of Main
Regulator diaphragm. This Loading pressure is a constant pressure equal to the desired
outlet pressure plus the pressure required to counter-balance the Light Closing Spring.
Increasing Load Condition
As load increases downstream, the outlet pressure in lower diaphragm chamber is reduced
and constant pressure above the main diaphragm forces the diaphragm downward. This motion
is transmitted through the Main Regulator lever to open the main valve to the proper
position to meet the flow rate. Gas simultaneously begins to flow across the Bleed Hole,
which momentarily reduces the loading pressure. The pilot diaphragm senses the reduced
loading pressure and the pilot valve opens to maintain a constant loading pressure.
Decreasing Load Condition
When the flow rate is decreased, the outlet pressure tends to increase. The pressure
increase is reflected in the lower diaphragm chamber increasing pressure below the main
diaphragm, thereby decreasing the differential pressure across the main diaphragm.
This allows the closing spring to move diaphragm upward, closing the main valve and
throttling gas flow. The pilot then senses a pressure rise in the loading pressure
chamber and closes its valve.
No-Load (Lock-up) Condition
As load decreases to zero, the downstream pressure begins to rise, which stops the
flow of gas through the bleed hole in the main diaphragm. At the same time, the
pressure across the main diaphragm is equalized, which allows the closing spring to
close the main valve. The upward movement of the main diaphragm causes the loading
chamber pressure to increase slightly, which in turn causes the pilot to close.
Option Designations
Standard - (See description below)
M - (See description below)
IM - (See description below)
IMV - (See description below)
Descriptions
CL38 – Internal registration (no control line required)
CL38M– Equipped with closed-throat and control line tap for remote
downstream control (External registration)
CL38IM – Equipped with an Internal Monitor orifice; Internal Registration
(no control line required)
CL38IMV – Equipped with an Internal Monitor Orifice plus Vent hole option
for Monitor warning indication; Internal Registration (no control line required)
*All versions are available with either
–1 or –2 pilot:
#1 pilot for 5“ w.c. to 5 PSIG outlet pressure (Model Name Example: CL38-1)
#2 pilot for 1 PSIG to 30 PSIG outlet pressure (Model Name Example: CL38-2)
Features
Constant loaded pilot design (“fixed-factor” pressure control)
Interchangeable brass orifice
Internal lower diaphragm chamber pressure flow control
133 in2 of diaphragm area
Spring-loaded pilot internal relief valve assembly
Field interchangeable pilot adjustment spring
Controlled internal bleed hole eliminates pulsation
Wide range of valve body sizes including NPT and Flange connections
16 different available assembly positions
Capacities from 1500 CFH to 20,000 CFH available
Benefits
Economical
Light weight
Accurate pressure control for “fixed-factor” measurement applications
No special start-up procedures required
Internal Monitor version eliminates the need for external relief valves or separate monitoring devices
No special tools required for outlet pressure adjustment
No minimum differential pressure requirement
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