Sensus 143-IRV-1 1/4 Regulator

The Sensus 143-80-2 Internal Relief Valve (IRV) Regulator is a specialized solution for residential and light commercial natural gas applications requiring precise pressure control. This model features a 1-1/4" NPT pipe size and a high-performance 3/8" orifice, engineered to handle significant flow capacities while maintaining a stable outlet pressure. Equipped with a Green Spring, the unit is calibrated for an adjustable outlet range of 6 to 14 inches Water Column (WC), making it ideal for standard furnace and water heater manifolds. The integrated IRV mechanism provides critical over-pressure protection by venting excess gas during seat failure or debris-related creep, ensuring system safety without requiring external relief piping in most configurations. Its union nut connection allows for 360-degree diaphragm rotation, streamlining installation in tight mechanical rooms where piping orientation is restricted.

• Precise Regulation: Large diaphragm area provides sensitive response to downstream demand changes.
• Internal Relief Protection: Minimizes the risk of over-pressurization with a reliable internal relief valve design.
• Installation Flexibility: The union nut allows for easy swivel of the regulator head to accommodate various inlet/outlet angles.
• Durable Construction: Built with high-strength cast iron and corrosion-resistant components for long-term field reliability.
• Venting Options: Features a 1" NPT vent connection, ensuring compliance with local jurisdictional codes when venting to the atmosphere.

What is the maximum inlet pressure for the Sensus 143-80?
The maximum allowable inlet pressure for this series is typically 125 PSIG, though performance is optimized based on the 3/8" orifice sizing for lower distribution pressures.

Can the 143-80-2 be installed in any orientation?
While the union nut allows the diaphragm to rotate 360 degrees, the regulator should ideally be installed with the vent pointing downward or protected from moisture and debris to prevent blockage.

Is the Green Spring compatible with higher pressure requirements?
The Green Spring is specifically designed for the 6-14" WC range. If your application requires higher delivery pressures, a spring swap to a heavier gauge would be necessary.

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.