Watts 0556034 Valve

The Watts 0556034 (Model LF3L-150) is a high-performance 3/4 inch poppet type pressure relief valve designed specifically for domestic storage tanks and tankless water heaters. As the direct lead free replacement for the legacy Watts 0011917, this valve features a lead free copper alloy body and a rugged stainless steel spring to ensure reliable operation in demanding residential and commercial plumbing systems. Factory-set at 150 psi, this ASME rated safety device provides critical protection against excessive pressure buildup, effectively safeguarding downstream components from potential catastrophic failure.

Engineered for seamless integration, the LF3L-150-3/4 utilizes a 3/4" NPT male threaded inlet and a 3/4" NPT female threaded outlet for straightforward installation. This hot water pressure relief valve is frequently paired with thermal expansion control devices to manage system stress in closed-loop configurations. While it does not include a temperature-sensitive element like standard T&P valves, its poppet-style design is optimized for tankless water heater safety and storage applications where pressure-only relief is required by local code. The integrated test lever allows technicians to verify seat integrity and clearing during routine maintenance inspections.

• Lead Free Construction: Complies with NSF/ANSI 372 and lead-free installation requirements for potable water systems.
• Precise Pressure Control: Factory-calibrated to 150 psi with a discharge capacity up to 200,000 BTU/hr to prevent over-pressurization.
• Durable Internal Components: Equipped with a silicone disc and stainless steel spring for extended service life in high-temperature environments.
• ASME Certified Safety: Meets rigorous industry standards for pressure-only relief in residential and industrial storage tanks.
• Drop-In Compatibility: Serves as the modern updated version for 0011917, ensuring exact fit and function for existing 3/4" NPT connections.

Is the Watts 0556034 a direct replacement for the 0011917?
Yes, the 0556034 is the official lead free equivalent and updated model for the older 0011917 valve, maintaining the same 3/4" NPT footprint and 150 psi rating.

Can this valve be used on tankless water heaters?
Absolutely. The LF3L-150 is commonly used as a tankless water heater relief valve to protect the heat exchanger from pressure spikes caused by thermal expansion or pump operation.

Does this model provide temperature relief?
No, this is a pressure-only relief valve. It is designed to open based on system pressure (150 psi) and does not contain the thermal probe found on full T&P (Temperature and Pressure) valves.

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.