Lochinvar & A.O. Smith 100171704 Gas Valve

The Lochinvar & A.O. Smith 100171704 Gas Valve is an OEM LP gas valve replacement engineered for precise manifold pressure regulation in high-efficiency residential heating and commercial water heaters. Designed to handle the higher energy density of liquid propane, this combination gas valve provides critical control over fuel flow, ensuring proper combustion and preventing soot buildup or irregular flame patterns. This unit serves as a direct upgrade for obsolete part VAL2019, maintaining 11.0" W.C. minimum inlet pressure for stable operation. For service technicians, the integrated manual shut-off and adjustable regulator facilitate streamlined troubleshooting of ignition failure or pilot outages. Whether you are servicing a Lochinvar Knight series or a specialized A.O. Smith boiler, the 100171704 ensures HVACR system compatibility and restores factory-spec heating performance. Durable internal components resist contaminants and fouling, extending the lifecycle of the burner assembly in demanding environments.

Key Benefits

• OEM Precision: Direct Lochinvar replacement part ensures exact fitment and avoids the safety risks associated with "will-fit" aftermarket valves.
• LP Specific Calibration: Pre-set for liquid propane applications to maintain a consistent 10.0" W.C. manifold pressure for optimal BTU output.
• Advanced Regulation: Features a negative pressure sensing mechanism that coordinates with the blower to allow gas flow only when proper combustion air is present.
• Streamlined Installation: Compact design with a built-in manual gas cock and 1/8" hex plug for easy pressure testing at the manifold.

Common Questions

Is the 100171704 a direct replacement for the obsolete VAL2019?
Yes, the 100171704 gas valve is the official successor to the VAL2019, providing updated electronic control logic for better sensing and faster response times.

Why is my burner failing to light with this valve installed?
Ensure the flame sensor is clean and that the minimum gas supply pressure is at least 11.0" W.C. while flowing. Low dynamic pressure or air trapped in the lines are frequent causes of lockout.

Can I use this gas valve for a natural gas conversion?
No, this specific part is calibrated for LP gas. Conversions require a different gas control valve and specific orifices to match the requirements of the venturi and burner system.

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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.