Watts 0556036 Relief Valve

The Watts 0556036 is a professional-grade LF530-C lead-free pressure relief valve engineered for critical protection in residential, commercial, and industrial hydronic systems. This 3/4-inch calibrated pressure relief valve is specifically designed to manage excessive pressure in systems carrying water, oil, or air, making it an essential component for bypass thermal expansion relief. Constructed with a lead-free brass body and a corrosion-resistant stainless steel spring, the LF530-C ensures reliable performance in diverse environments. The Watts 0556036 features a convenient calibrated adjustment scale, allowing technicians to field-set the relief pressure across a range of 50 to 175 psi. This model serves as the modern, compliant replacement for the 0372271 and is physically identical to the 530C-3/4 and LF530-C-3/4 variants. With a 3/4-inch MNPT inlet and a 1/2-inch FNPT discharge, this MNPT relief valve provides a high-seating integrity via a precision-machined seat and Buna-N disc.

• Lead-Free Compliance: Manufactured from lead-free brass to meet rigorous potable water and safety standards.
• Field-Adjustable Calibration: Integrated adjustment feature allows for precision settings between 50 and 175 psi without additional tools.
• Thermal Expansion Protection: Highly effective as a bypass thermal expansion valve to prevent system fatigue and component damage.
• Rugged Internal Design: Equipped with a heavy-duty stainless steel spring and Buna-N O-ring for long-term sealing stability up to 180°F.
• Universal Media Compatibility: Rated for use in plumbing and HVACR applications involving air, oil, or water.

Is the Watts 0556036 ASME approved?
No, the LF530-C series is designed for pressure relief only and is not an ASME-approved safety relief valve. It should not be used in high-pressure steam or safety-critical applications requiring ASME certification.

What is the difference between the 0556036 and the 0372271?
The 0556036 is the lead-free version (LF) required for most modern potable water installations, whereas the older 0372271 is the standard brass model. Both share the same 3/4" MNPT dimensions and pressure range.

Can I install this valve in any orientation?
While typically installed with the inlet at the bottom and the drain on the side, it is crucial to ensure the discharge line is piped to a safe location according to local plumbing codes.

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.