Honeywell Maxon Safety Shut Off Valve Open/Close Switch – 57371
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The Honeywell Maxon 57371 Open/Close Switch Assembly adds positive valve position proof to large-frame Maxon safety shut-off valves. Designed for 3″–6″ GP VCS1/VOS1 valves, it provides discrete “valve open” and “valve closed” signals for burner management systems, enabling code-compliant proof-of-closure (POC) and open-position interlocks.
Overview
This switch assembly mounts directly to the valve actuator and tracks shaft position through a robust cam mechanism. Dry contact outputs integrate with flame safeguards, PLCs, and safety relays for start-permissive logic, shutdowns, and maintenance diagnostics. The industrial housing and repeatable trip points support reliable service in combustion applications.
Key Benefits
- Provides independent “open” and “closed” position feedback for safety interlocks
- Optimized for 3″–6″ GP VCS1/VOS1 valve bodies and actuators
- Dry contacts for easy wiring to BMS/PLC safety circuits
- Repeatable actuation with adjustable cams for accurate set-up
- Rugged enclosure suitable for industrial burner environments
Applications
Use on process heaters, furnaces, boilers, ovens, dryers, and incinerators where verified valve position is required for NFPA/EN safety logic, proof of closure, and permissive start sequences.
