BASO H19AA-4 Gas Valve

The BASO H19AA-4 Automatic Shut-Off Pilot Gas Valve is a critical safety component designed for high-reliability standing pilot systems. Engineered for natural gas and liquid propane (LP) applications, this 3/8" NPT gas valve provides a 100% shut-off capability if the pilot flame is extinguished, preventing hazardous gas accumulation. This specific model features a 1/4" compression coupling pilot tap positioned on the left side and is configured without an integrated pilot adjustment valve, maintaining a compact footprint for tight furnace or boiler cabinets. With a maximum pressure rating of 0.5 PSI, the H19AA-4 is a direct drop-in replacement for the BASO H19AA-4C, sharing identical mechanical specifications and flow characteristics. Contractors utilizing this pilot safety valve will find it compatible with various thermocouple-driven HVAC systems, ensuring stable dropout times and robust performance in demanding commercial or residential heating environments. Proper orientation and adherence to the flow direction arrow are required for correct installation and safety compliance.

• Universal Fuel Compatibility: Precision-machined to handle both Natural Gas and Propane applications up to 0.5 PSI.
• 100% Safety Shut-off: Reliable power element engagement ensures immediate gas flow termination if the pilot flame fails.
• Compact 3/8" NPT Ports: Standardized inlet and outlet sizing simplifies the replacement of obsolete BASO valves or legacy Johnson Controls components.
• Left-Hand Pilot Tap: Strategically positioned 1/4" compression tap allows for easier tubing runs in cramped equipment footprints.
• Verified Interchangeability: Fully interchangeable with model H19AA-4C, streamlining inventory and field service selection.

Is the BASO H19AA-4 compatible with millivolt systems?
Yes, this valve is designed to work with standard thermocouples typically used in millivolt or standing pilot heating equipment.

What is the difference between the H19AA-4 and the H19AA-4C?
There is no functional or physical difference; the H19AA-4 is identical to the H19AA-4C and can be used interchangeably in all applications.

Does this valve include a pilot adjustment screw?
No, this specific configuration is built without a pilot adjust valve. Pilot flame height must be managed via the primary regulator or substituted with an adjustable model if localized control is required.

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.