Sensus 143-1 Regulator

The Sensus 143-1 Gas Regulator (Rockwell-Equimeter Series 143-80) is a rugged, union-nut connection service regulator engineered for residential and light commercial meter sets. This specific configuration features a 1" NPT inlet, a 3/8" aluminum orifice, and a green spring calibrated for a 6–14" WC (water column) outlet pressure range. Built with a cast iron valve body rated for up to 125 psig working pressure, it provides the precise pressure control required for high-efficiency furnaces, boilers, and gas engines. The 143-1 design eliminates the need for bolts or screws between the diaphragm assembly and the body, allowing for 360-degree rotation and flexible field installation in any orientation—vertical, horizontal, or diagonal.

• Field Versatility: The union nut connection allows for easy orifice inspection and maintenance without removing the regulator from the piping.
• Advanced Safety: Features an integrated Internal Relief Valve (IRV) that activates approximately 7–10" WC above the set point to protect downstream equipment.
• Corrosion Resistance: Die-cast aluminum spring housing and lower case are finished with a chromate conversion coating and enamel topcoat for outdoor durability.
• Broad Media Compatibility: High-performance regulation for natural gas, LPG (propane), air, dry CO2, and other non-corrosive gases.
• Precision Components: Equipped with a Buna-N diaphragm reinforced with nylon fabric for a 26 sq. in. effective area and consistent response.

What is the maximum inlet pressure for this 3/8" orifice model?
While the cast iron body is rated for 125 psig, the 3/8" orifice configuration typically has a maximum recommended inlet pressure of 40 psig to maintain optimal lock-up performance and regulation accuracy.

Can this regulator be installed in any orientation?
Yes, the Series 143-80 can be mounted in any position. However, for outdoor installations, the 1" NPT vent must face downward or be piped away to prevent water and debris from entering the diaphragm chamber.

Is this regulator suitable for propane (LPG) applications?
Absolutely. Simply apply the conversion factor for 1.5 specific gravity to calculate the flow capacity compared to natural gas (0.6 S.G.).

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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.