Maxon 250SMA11AA11BB21A0 Gas Valve

The Maxon 250SMA11AA11BB21A0 Gas Valve is a 2 1/2" ANSI threaded electromechanical safety shut-off valve engineered for critical fuel gas applications in industrial boilers and furnaces. This normally closed gas valve features a cast iron body and a standard port flow capacity (Cv 127), ensuring reliable gas safety shut-off and control. Built for standard duty environments, it utilizes Buna body O-rings and bumpers with Internal Trim Package 1 to maintain a tight seal under diverse operating conditions.

This automatic reset gas valve is powered by a 115Vac 60Hz motor and solenoid, providing a 6-second motor timing for controlled opening while maintaining the Maxon Series 5000 signature capability of closing in less than one second upon power interruption. The integration of VOS1/VCS1 position switches allows for reliable proof-of-closure and proof-of-open signaling to your burner management system (BMS). Housed in a NEMA 4 enclosure, this valve is protected against environmental ingress, making it a rugged choice for heavy-duty commercial and industrial combustion systems.

• Rapid Shut-Off: Powerful internal springs ensure the valve returns to the closed position in under one second for maximum safety.
• Durable Construction: The cast iron body and metal-to-metal seating provide long-term reliability in high-cycle industrial environments.
• System Monitoring: Integrated VOS1/VCS1 switches facilitate seamless connection to diagnostic and safety interlock circuits.
• Environmental Protection: The NEMA 4 rating ensures the actuator is shielded from dust and water spray.
• Precision Flow: Standard port design supports a Cv of 127, optimized for consistent gas flow control.

What is the maximum operating pressure differential (MOPD) for this valve?
This specific 2.5-inch Maxon SMA gas valve typically supports a maximum operating pressure differential of up to 40 PSIG, depending on the specific internal configuration and media.

Can the actuator be rotated for varied piping orientations?
Yes, the top assembly is field-rotatable in 90-degree increments, allowing for flexible installation in horizontal or vertical piping runs without compromising the visibility of the visual position indicator.

What media is compatible with the Buna seals in this 250SMA model?
The Buna (Nitrile) O-rings and bumpers are ideal for general-purpose applications involving clean fuel gases like natural gas and propane. For corrosive gases, specialized trim packages may be 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.