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Constant Loaded
Actaris / Schlumberger Constant Loaded Regulators
utilize constant pressure supplied by a pilot regulator as the loading element
for the main regulator. This design eliminates the outlet pressure droop at high
flows associated associated with the spring effect in spring loaded regulators.
CL regulators can thus maintain extremely accurate regulation at higher flows
and higher outlet pressures than spring loaded regulators. Typical applications
include elevated pressure gas supply to commercial and industrial installations,
fixed factor metering installations (eliminating the need for expensive
instrumentation), and all types of applications requiring accurate psi-to-psi
regulation at widely varying flow rates. Features of Actaris / Schlumberger
constant loaded regulators include:
- Accurate Regulation
Constant loading pressure is supplied to the main regulator by a pilot
regulator enabling "straight-line" regulation to be maintained over a wide
range of flows and outlet pressures.
- Internal Bleed
Loading pressure bleeds downstream through the main diaphragm. No bleed
occurs at lockup.
- Low Pressure Differential
CL regulators can operate with as little as 1/2 psi differential between
inlet and outlet pressure
| Constant Loaded Principle of Operation
Inlet pressure is piped through external tubing to the pilot regulator. The
pilot regulator is adjusted to reduce the inlet pressure to the desired
outlet pressure plus enough pressure to overcome the light closing spring
(loading pressure). Constant loading pressure is piped to the top of the
main regulator diaphragm. |
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- When demand is approximately 50 cfh or less, gas is supplied
through a bleed hole in the main diaphragm
- When demand increases above what can be supplied through the bleed hole,
outlet pressure decreases slightly, causing an increase in pressure
differential across the diaphragm. The diaphragm moves downward, and the main
valve is repositioned to match the increased downstream demand and recover
desired outlet pressure.
- When flow decreases, outlet pressure increases slightly, causing a
decrease in pressure differential across the diaphragm. The closing spring
causes the diaphragm to move upward. The main valve is repositioned to
restrict flow to match the decreased downstream demand and recover desired
outlet pressure.
- When demand is shut off, outlet pressure continues to rise. The increased
pressure is transmitted through the bleed hole to the pilot regulator. The
pilot regulator locks up bubble-tight. The closing spring maintains
bubble-tight lockup at the main valve.
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CL31 Series
The CL31 Series is designed to provide extremely accurate regulation of
intermediate volumes of gas (to 4000 SCFH) at elevated pressures (1 to 20
psig). The CL31R features a relief-type pilot regulator to provide token
relief and to prevent excess loading pressure from entering the main
regulator should the pilot regulator fail. The CL31N features a non-relief
pilot regulator and can be used for outlet pressures over the entire range
without changing the pilot adjustment spring. |
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CL231 Series
The CL231 Series is a compact, cost-effective regulator designed for
mid-sized commercial applications (to 7500 SCFH) which require accurate
regulation at elevated pressures. The CL231R features a relief-type pilot
regulator to provide token relief and to prevent excess loading pressure
from entering the main regulator should the pilot regulator fail. The CL231N
features a non-relief pilot regulator and can be used for outlet pressures
over the entire range without changing the pilot adjustment spring. |
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