Sensus 143-IRV-1 Regulator

The Sensus 143-IRV-1 Regulator is a job-site standard for residential natural gas service and light commercial meter sets. Built on the rugged 143-80 chassis, this model features a 1-inch NPT inlet and a 3/8-inch orifice, delivering precise pressure reduction for HVAC burners, unit heaters, and boilers. The integrated internal relief valve (IRV) provides essential overpressure protection, while the green spring is factory-calibrated for an outlet range of 6-14 inches water column (WC).

Designed for versatile installation, the Sensus 143-IRV-1 utilizes a union nut connection that allows the diaphragm case to be rotated or the orifice to be serviced without breaking the piping. The cast iron valve body handles a maximum working pressure of up to 125 psig, making it a reliable choice for natural gas pressure regulation in demanding environments. This regulator also performs effectively with propane, air, and other non-corrosive gases.

• Overpressure Protection: Integrated internal relief valve enhances system safety by venting excess pressure.
• Serviceability: Union nut design permits 360-degree rotation and quick orifice replacement without removing the body from the line.
• Corrosion Resistance: Dip-primed chromate conversion coating with an enamel topcoat for long-term outdoor performance.
• Wide Application: Compatible with natural gas, LP, and air for furnaces, ovens, and gas engines.

What is the maximum inlet pressure for the 3/8" orifice version?
The 3/8-inch aluminum orifice is rated for a maximum inlet pressure of 40 psig. For higher pressure high-load applications, ensure your supply pressure does not exceed this rating to prevent seat damage.

Can this regulator be installed in any orientation?
Yes, it can be mounted in multiple positions. However, for outdoor installations, the vent should face downward to prevent moisture and debris from entering the diaphragm case.

Is this regulator suitable for LP gas?
Absolutely. While commonly used for natural gas, the Sensus 143-IRV-1 is equally effective for regulating propane (LPG) and other non-corrosive technical gases.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.