Watts 0555180 Valve

The Watts 0555180 (Series LF600) is a high-performance 2" NPT silent check valve engineered to replace the legacy 0376357 model. Constructed with a lead-free cast copper silicon alloy body, this Maxi-Flo bronze check valve utilizes a conical disc and PTFE seat to ensure positive shut-off and mitigate the damaging effects of water hammer. For HVACR contractors managing clear water or steam applications, this valve provides a low-pressure drop comparable to a standard swing check valve while offering the quiet operation of a vertical lift check. Its versatile design permits installation in both horizontal and vertical flow-up positions.

Rated for 400 PSI WOG (non-shock) and 15 PSI WSP at 250°F, the Watts LF600 features stainless steel guide rods and springs for long-term mechanical reliability in demanding fluid control systems. This lead-free in-line check valve is specifically designed for commercial plumbing and industrial process lines where preventing reverse flow is critical. The 2-inch female NPT connections ensure a secure fit for standard threaded piping, making it a drop-in replacement for modernizing existing system footprints with improved acoustic performance and corrosion-resistant internals.

• Silent Operation: Conical disc design eliminates the "clunk" common in traditional swing checks.
• High Pressure Rating: Robust construction supports up to 400 PSI WOG for industrial safety.
• Multi-Positional: Operates efficiently in horizontal or vertical (upward flow) orientations.
• Lead-Free Compliance: Cast copper silicon alloy body meets all stringent potable water standards.
• Reduced Pressure Drop: Full-flow internal geometry maintains system efficiency and flow velocity.

Is the 0555180 a direct replacement for the 0376357?
Yes, the 0555180 is the updated, lead-free version of the discontinued 0376357 and maintains identical NPT sizing for seamless retrofitting.

Can this valve be used with air compressors or sewage?
No, this model is specifically engineered for clear water lines and steam. It should not be used in sewage ejector or air compressor applications.

Does this valve prevent water hammer?
Yes, the spring-loaded conical disc is designed to close immediately upon flow reversal, significantly reducing hydraulic shock in the piping system.

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.