Lochinvar & A.O. Smith 100171870 Gas Valve

The Lochinvar & A.O. Smith 100171870 Gas Valve is a critical 2-inch gas valve designed for high-capacity flow control in industrial and commercial heating systems. As a direct OEM replacement part, this component is identical to the VAL2711 and is engineered to maintain precise manifold pressure for optimal combustion efficiency. Veteran technicians rely on the 100171870 for its robust NPT brass connection and compatibility with Lochinvar Power-Fin and Copper-Fin II boilers, specifically the PF1700-2000 and PB1700-2000 series. This redundant gas valve features a built-in low gas pressure regulator and is referenced to the combustion chamber to ensure a stable air-to-fuel ratio. When troubleshooting ignition failure or erratic burner behavior in A.O. Smith water heaters, replacing a worn actuator or diaphragm with this genuine Lochinvar gas valve assembly ensures the system meets its 85% thermal efficiency rating while preventing gas leaks and hazardous back-pressure conditions during the hot surface ignition cycle.

• Direct Cross-Reference: 100171870 is a 1:1 drop-in replacement for the Lochinvar VAL2711, simplifying field service and inventory management.
• High-Flow Capacity: The 2-inch valve orifice is designed to handle the high BTU demands of large-scale commercial boilers and water heaters.
• System Reliability: Features redundant valve seats to provide an extra layer of safety and prevent gas migration during standby mode.
• Precision Regulation: Integrates an internal gas pressure regulator to stabilize fuel delivery despite fluctuating supply line pressures.

Is the 100171870 compatible with propane systems?
This specific part is typically configured for natural gas applications. Verify the orifices and spring kit requirements if converting to LP gas to ensure the proper WC pressure settings are maintained.

What are the symptoms of a failing VAL2711 gas valve?
Technicians often look for boilers that fail to light, "gas valve did not open" error codes on the Smart System control panel, or delayed ignition sounds caused by a sticking solenoid.

Does this valve include the required gaskets for installation?
While the 100171870 is the main gas valve assembly, it is best practice to inspect the GKT2444 or GKT2438 gaskets and replace them during service to ensure a gas-tight seal at the inlet and outlet flanges.

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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.