Watts 0555176 Valve

The Watts 0555176 (Series LF600) is a high-performance 3/4 inch silent check valve designed for demanding HVACR and plumbing applications where backflow prevention and noise reduction are critical. This lead-free brass check valve features a cast copper silicon alloy body, making it a rugged industrial solution for potable water systems. As the direct lead-free replacement for the legacy 0376353 (600-3/4) model, it maintains a low pressure drop comparable to traditional swing checks while utilizing a spring-loaded silent operation to eliminate water hammer and system chatter.

Engineered for versatility, the Watts LF600-3/4 supports both horizontal and vertical upward-flow orientations. The internal assembly includes a PTFE seat and a conical disc to ensure a bubble-tight seal and long-term reliability in high-cycle environments. With a 400 PSI WOG non-shock pressure rating and a temperature range of -20°F to 100°F (and up to 15 PSI WSP at 250°F), this FNPT check valve is built to withstand the rigorous pressure and thermal fluctuations common in commercial and industrial piping arrays.

• Eliminates Water Hammer: The silent, spring-assisted closing mechanism prevents the shockwaves associated with standard swing check valves.
• Lead-Free Compliance: Constructed from lead-free cast copper silicon alloy for safe use in all potable water installations.
• High Pressure Resilience: Rated for up to 400 PSI, providing a significant safety margin for high-pressure fluid control.
• Superior Sealing: Features a PTFE seat and stainless steel spring for chemical resistance and leak-proof performance.
• Streamlined Installation: Compact 2-1/2 inch inlet-to-outlet length with standard 3/4" FNPT threaded ends for rapid field replacement.

Can the LF600 be installed in a vertical downward flow?
No. This valve is designed for horizontal or vertical upward flow only. Installing it in a downward-flow configuration will prevent the spring and disc from seating correctly.

Is the Watts 0555176 suitable for steam applications?
Yes, it is rated for 15 PSI WSP (Working Steam Pressure) up to 250°F, making it suitable for low-pressure steam service.

What is the difference between the 0555176 and the 0376353?
The 0555176 is the updated lead-free version. While the dimensions and 3/4" NPT connections remain identical for an easy swap, the 0555176 meets current environmental standards for drinking water safety.

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.