Maxon 600HMA11BA11BB31A0 Gas Valve

The Maxon 600HMA11BA11BB31A0 is a heavy-duty, 6-inch electromechanical safety shut-off valve engineered for high-capacity fuel gas service in industrial boilers, furnaces, and kilns. Featuring a robust cast iron body and an ANSI flanged connection, this normally closed gas valve is designed for immediate closure upon power interruption, ensuring a critical fail-safe in combustion systems. The unit utilizes Buna-N O-rings and bumpers for reliable sealing and is equipped with a 115VAC 60Hz motorized actuator that provides a 12-second opening timing and a rapid closing response of less than one second. For advanced system monitoring, this model includes VOS1/VCS1 visual override switches (Proof-of-Open and Proof-of-Closure), facilitating seamless integration with PLCs and Flame Safeguard controls. The NEMA 4 enclosure rating ensures protection against dust and water, making it suitable for demanding mechanical room environments. As a high-flow general purpose gas valve, it maintains a high Cv rating to minimize pressure drop across large-scale burner trains while providing auto-reset functionality for automated recovery after safety trips.

• High-Capacity Flow: Designed with a 6-inch ANSI flanged body to handle large volumes of natural gas or propane with minimal pressure loss.
• Rapid Shut-Off: The powerful internal spring ensures a positive, leaktight seal in under one second during emergency shutdowns or power loss.
• Industrial Durability: Cast iron construction and a NEMA 4 rated enclosure provide longevity in harsh industrial heating applications.
• System Feedback: Integrated VOS1/VCS1 switches offer reliable Proof of Closure (POC) and open-state verification for combustion safety interlocks.
• Field Flexibility: The top actuator assembly is rotatable in 90-degree increments to accommodate complex piping layouts and limited clearance.

What is the purpose of the VOS1 and VCS1 switches?
These are internal limit switches used for remote signaling. The VCS1 (Valve Closed Switch) provides "Proof of Closure" to the burner management system (BMS), while the VOS1 (Valve Open Switch) confirms the valve has reached its full travel position.

Can this valve be mounted in any orientation?
While the Maxon 600HMA is typically installed in horizontal gas lines, the motorized top assembly can be rotated. However, the visual window indicator should never face downward to ensure it remains visible to maintenance personnel.

Is this valve suitable for corrosive gas service?
This specific configuration uses Buna-N seals and a cast iron body, which are standard for natural gas and clean fuel gases. For corrosive applications or oxygen service, a different trim package and seal material (such as Viton) would 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.