Maxon 300SMA11AA11BB21A0 Gas Valve

The Maxon 300SMA11AA11BB21A0 Gas Valve is a rugged, 3-inch industrial shut-off valve designed for mission-critical burner systems. As the direct replacement for Maxon 300SMA11, this unit features a heavy-duty cast iron body and is configured for 2-way normally closed operation. This auto-reset gas valve utilizes a standard port flow capacity with ANSI threaded connections, ensuring high-flow efficiency for natural gas, propane, or air service. Technical specifications include a 115VAC 60Hz solenoid and motor, delivering a precise 6-second motor timing for controlled opening. Built with Internal Trim Package 1 and Buna body O-rings, it maintains a positive seal in general-purpose gas flow management. The NEMA 4 enclosure rating ensures protection against weather and dust, while integrated VOS1/VCS1 visual and proof-of-closure switches provide the feedback required for modern flame safety interlock circuits.

Technical Benefits:

• Simplified Field Upgrade: Serves as the official replacement for 300SMA11, matching legacy footprints for rapid installation.
• Enhanced Environmental Protection: The NEMA 4 rating allows for reliable operation in outdoor or wash-down industrial environments.
• Verified Closure: Includes VOS1/VCS1 switch options for mandatory proof-of-closure (POC) safety signaling.
• Durable Internal Trim: Features Buna O-rings and bumpers with Package 1 trim for long-cycle reliability in commercial combustion.

Common Questions:

Is the Maxon 300SMA11AA11BB21A0 compatible with outdoor burner racks?
Yes, the NEMA 4 enclosure provides the necessary protection against moisture and dust for outdoor gas train assemblies.

Can I use this valve for emergency manual shut-off applications?
This specific model is an auto-reset gas valve. It is designed to open automatically when powered and close upon power loss or safety limit interruption.

What is the difference between this and the older 300SMA11 model?
The 300SMA11AA11BB21A0 is the current production standard, ensuring compliance with the latest ANSI threaded gas valve specifications while maintaining physical compatibility with the older model.

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.