Williams P500420 Gas Valve

As a seasoned tech, you know that maintaining precise manifold pressure is non-negotiable for system safety and combustion efficiency. The Williams P500420 Gas Valve is an OEM replacement gas valve engineered specifically for Williams Comfort Products heating systems. This 10.5" WC LP gas valve is factory-calibrated for liquid propane (LP) applications, ensuring the correct fuel-to-air ratio for high-output furnace gas valve performance. Whether you are servicing a Williams Monterey furnace, a direct-vent heater, or a counterflow unit, this low pressure gas control provides the reliable millivolt or 24V switching required for consistent pilot ignition and main burner regulation.

Constructed for durability in both residential and commercial HVACR environments, the P500420 features a robust internal diaphragm designed to handle the specific density of propane. This replacement heating part eliminates the risks associated with improper field conversions by providing a dedicated LP gas valve 10.5 inch WC solution. When diagnosing furnace burner issues or intermittent pilot outages, swapping in this genuine Williams furnace part ensures your installation meets original manufacturer specifications and local mechanical codes. Professional-grade porting and a compact footprint allow for straightforward integration into tight cabinet clearances common in Williams wall furnaces.

• OEM Precision: Genuine Williams Comfort Products component ensures exact fitment and avoids the reliability issues of universal aftermarket valves.
• Propane Optimized: Factory set to 10.5" Water Column, specifically for LP gas systems, preventing over-firing or soot accumulation.
• Enhanced Safety: High-quality internal shut-off mechanisms provide 100% safety lockout in the event of pilot flame failure.
• Contractor Grade: Built to withstand the high-cycle demands of commercial HVAC and residential wall heaters.
• Technical Compatibility: Engineered for seamless interface with existing Williams heating equipment safety strings and thermocouples.

• Can this valve be converted for use with Natural Gas? No, this part is specifically calibrated for 10.5" WC LP gas only. Using it with Natural Gas will result in improper combustion and unsafe operating conditions.
• Which Williams furnace models is the P500420 compatible with? It is commonly used in high-capacity Williams Monterey and Counterflow furnaces. Always verify your specific model and serial number against the OEM part number before installation.
• Is this a millivolt or a 24V valve? This is a standard furnace replacement valve typically found in Williams systems; confirm your system's control voltage and manifold requirements to ensure a match.

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.