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CL231 Regulator
ITRON / ACTARIS / SCHLUMBERGER / SPRAGUE CL231 GAS REGULATOR.
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Applications
The CL231 regulator is designed primarily for use in medium size commercial and industrial installations requiring highly accurate pressure regulation. The CL231 can produce substantial savings for users in lower initial costs, lower installation costs, and lower maintenance costs.
The CL231 was designed for systems requiring highly accurate pressure regulation such as:
Metering loads (approx. 500 to 7500 CFH) without the need for expensive instrumentation.
As a 1 ½” or 2” regulator covering the outlet range from 1 PSIG to 20 PSIG without downstream control.
Where very accurate PSI to PSI regulation (± 1% outlet pressure absolute) is desired than is obtainable from conventional spring loaded regulators ahead of a “Fixed Factor Billing” meter or ahead of a “Pressure Compensating Index” meter.
As a reliable and accurate replacement (without downstream control) for conventional regulators requiring downstream control.
Operating Temperature Range:
-20°F to 150°F
-29°C to 65°C
Principle of Operation
(See Operating Schematic below)
Inlet pressure (Tint 1), connected by tubing to the pilot regulator, is utilized as supply pressure for the pilot. Setting of the pilot regulator spring determines the desired outlet pressure (Tint 3) of main regulator. Outlet pressure of the pilot regulator is applied to the top of the main diaphragm (B). Loading pressure (Tint 2) is a constant pressure equal to the desired outlet pressure plus the pressure required to counterbalance the light closing spring (C). When rate of flow is less than 50 cfh, the only regulator in operation is the pilot regulator. The Main valve (D) is closed any time flow rate is less than that supplied by the pilot regulator (through the bleed orifice (E) between the upper and lower diaphragm case) and the pressure is equalized in both the upper and lower diaphragm chambers (tints 3 and 2). No flow, or lock up pressure, is the outlet pressure required to close the pilot regulator.
Increasing Load:
If the demand for gas is increased, the outlet pressure (tint 3) is reduced and loading pressure (tint 2) above the diaphragm forces the diaphragm downward. This motion is transmitted through the lever (F) to open the main valve (D) to the proper position to match the demand.
Decreasing Load:
When flow rate is decreased, outlet pressure (tint 3) will increase. This pressure increase decreases the pressure differential across the main diaphragm (B). This allows the closing spring (C) to move the diaphragm upward, closing the valve (D) and throttling the gas flow.
Option Designations
R - (See description below)
N - (See description below)
Descriptions
CL231R – The CL231R is a constant pressure loaded regulator equipped with a pilot internal relief valve. The pilot relief valve is not designed for “full capacity” relief, but rather to limit the loading chamber pressure to a safe value in the event of failure.
CL231N– The CL231N is a constant pressure loaded regulator that utilizes a pilot with no internal relief (N). This regulator can be used where PSIG to PSIG regulation is required with no internal relief.
Features
Internal bleed to prevent vapor lock-up
Internal lower diaphragm chamber pressure flow control
Wide range of set points available with minimum number of springs
Compact regulator able to provide flow rates up to 7500 CFH
Benefits
No special start-up procedures
Constant pressure loading
Light valve closing spring
Easy pressure adjustment via pilot regulator
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