Weil McLain 383-500-095 Valve

The Weil McLain 383-500-095 ASME Pressure Relief Valve is a critical safety component designed for hydronic heating systems and residential gas boilers. This OEM Weil McLain replacement part is engineered to activate precisely at 30 PSIG, preventing over-pressurization and potential vessel failure. Featuring a 3/4" NPT male inlet and a 3/4" FPT female outlet, this brass-bodied valve ensures a secure, leak-free connection. It is the direct replacement for part number 511-546-920 and is commonly specified for high-efficiency units like the Weil McLain Ultra and ECO Tec series. As an ASME-certified pressure valve, it meets stringent industry standards for capacity and reliability. For service technicians, this is the standard solution for boiler pressure relief valve replacement when the existing unit exhibits "weeping" due to mineral buildup or failed internal seating. Using genuine parts ensures consistent performance and maintains the intended safety profile of the original equipment installation.

• ASME Certified: Built to meet strict safety mandates for residential and commercial hydronic applications.
• Direct OEM Fit: Eliminates piping modifications by using exact 3/4" NPT threading and a 30 PSI fixed set point.
• Broad Compatibility: Found as a factory-standard component in popular Ultra-80, Ultra-105, and ECO Tec-80 gas boilers.
• Durable Brass Construction: Resists corrosion and mineral scaling to ensure the spring-loaded mechanism remains operational.

Is this valve a universal replacement for all boiler models?
No. While many residential boilers use a 3/4" 30 PSI valve, you must verify the specific part number in your manufacturer’s service manual. This specific 383-500-095 model is tailored for Weil McLain equipment and replaces older part number 511-546-920.

Why is my current relief valve dripping or leaking?
Continuous dripping—often called weeping—usually indicates a buildup of sediment on the valve seat, a failing expansion tank, or system pressure consistently reaching the 30 PSI threshold. Replacing the valve is the primary fix once system-wide pressure issues are ruled out.

Can this valve be installed in any orientation?
Pressure relief valves should always be installed in the orientation specified by the boiler manufacturer and local mechanical codes, typically with the spindle in the vertical position and the discharge piping sloped for proper drainage.

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.