Model 243-RPC Natural Gas Pressure Regulator

The Model 243-RPC natural gas pressure regulator is a pilot-operated, high-precision regulator engineered for applications requiring exceptionally accurate pressure control across wide flow ranges. Built on the rugged Model 243 platform, the 243-RPC uses a secondary pilot regulator to sense downstream pressure and modulate the main valve—delivering stable, repeatable control largely unaffected by inlet pressure fluctuations.

Designed for fixed factoring, pressure factor measurement, pressure-compensated metering, and other critical gas control applications, the Model 243-RPC provides accuracy within ±0.5% of absolute outlet pressure from minimum flow through wide-open conditions. While commonly used for natural gas service, it performs equally well with LP gas, nitrogen, air, dry CO₂, and other non-corrosive gases.

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Model 243-RPC Features

• Pilot-Operated Relay Design: Uses a true relay principle of operation to deliver precise outlet pressure control that remains stable across changing inlet pressures.

• Exceptional Pressure Accuracy: Maintains regulation accuracy within ±0.5% (absolute outlet pressure) from minimum to maximum flow conditions.

• Wide Outlet Pressure Ranges: Supports pressure ranges from inches water column through high-psi outputs, depending on pilot spring selection.

• High Inlet Pressure Capability: Accommodates higher inlet pressures for upstream regulation, district stations, and industrial metering applications.

• Multiple Body & Orifice Configurations: Available in threaded and flanged bodies with a wide range of orifice sizes to match system capacity requirements.

• Monitor & Overpressure Protection Compatible: Designed for use in monitoring regulator sets and compatible with additional over-pressurization protection devices.

Benefits

• Ultra-Precise Pressure Control: Ideal for metering and measurement applications where even small pressure deviations affect accuracy.

• Stable Performance Across Variable Loads: Pilot operation minimizes the impact of inlet pressure changes and fluctuating flow demands.

• Improved System Reliability: Reduces downstream pressure excursions and protects sensitive equipment.

• Flexible Application Use: Suitable for commercial, industrial, and small distribution loads where pilot operation is specified.

• Long-Term Serviceability: Rugged construction and serviceable components support extended service life in demanding environments.

Capability

The Model 243-RPC regulator family supports a wide range of high-accuracy gas regulation applications.

• Application Types: Fixed factoring, pressure factor measurement, pressure-compensated metering, burners, gas engines, district regulator stations

• Gas Compatibility: Natural gas, LP gas, nitrogen, air, dry CO₂, and other non-corrosive gases

• Installation: Indoor or outdoor (not recommended for buried service)

• Pipe Sizes:

  • 1¼", 1½", and 2" NPT

  • 2" ANSI 125 lb flat-face flanged

• Control Options:

  • External control line (243-RPC / 243-RPC-A)

  • Internal control (243-RPC-B)

The 243-RPC is commonly used in monitor regulator arrangements to provide redundant pressure control and downstream protection in critical systems.

Specifications