Sensus 243-8-1 1/4 Regulator

The Sensus 243-8-1 1/4 is a heavy-duty commercial gas regulator engineered for precise pressure reduction in natural gas service. This model features a 1.25-inch NPT connection and a 1/2-inch orifice, making it a staple for technicians servicing boilers, furnaces, and large-scale water heaters. With a maximum inlet pressure of 125 PSIG, it handles high-demand fluctuations while maintaining a stable downstream flow. The integrated green-black spring is calibrated for an outlet pressure range of 6 to 14 inches W.C., providing the exact set point required for most low-pressure commercial appliances. Designed for versatility, this unit is interchangeable with the 243-8-1-1 1/4 configuration. The 10-degree orifice angle and internal relief features ensure rapid response times to load changes, minimizing the risk of pilot outages or equipment shutdowns in critical HVACR environments.

Technical Key Benefits:

• High Connection Capacity: 1.25" NPT threaded connections allow for high-volume flow rates suitable for industrial gas distribution.
• Standardized Orifice: The 1/2" orifice provides a balanced flow coefficient (Cv) for consistent performance across varying inlet pressures.
• Field Reliability: Rugged construction prevents diaphragm fatigue, ensuring long-term gas pressure regulation in outdoor or mechanical room installations.
• Optimized Set Points: The 6–14" W.C. spring range allows for fine-tuning to meet specific appliance manifold requirements.

Common Contractor Questions:

What is the difference between the 243-8-1 and the 243-8-1-1?
The Sensus 243-8-1 1/4 and the 243-8-1-1 1/4 are technically identical in performance and fitment; the naming variation often refers to internal manufacturing codes that do not affect installation or flow capacity.

Can this regulator be used for Propane (LPG) service?
While primarily used as a natural gas regulator, these units can be converted for LPG service, though orifice sizing and spring ranges must be verified against the higher BTU content and specific gravity of propane.

What is the vent size for this model?
This 243-8 series typically utilizes a 3/4" or 1" NPT vent depending on the specific diaphragm case; always ensure vent piping is sized correctly to prevent "breathing" lag during high-demand cycles.

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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.