Steam Valve Fail Position – NC or NO? Let’s Clear the Confusion!
September 1, 2025
In steam control applications, selecting the correct fail-safe position of a valve is not just about technical specifications—it’s about ensuring safety, maintaining performance, and serving the purpose of the system. The industry standard is typically fail-closed (normally closed), which means the valve shuts off steam flow in the event of a power or signal failure.
In HVAC steam applications, choosing the right fail-safe position of a control valve isn’t just about specs—it’s about safety, performance, and purpose.
So, what’s the ideal fail position for a steam control valve?
Fail-Closed (Normally Closed) is the industry standard.
It ensures steam stops flowing when power or control signal fails—avoiding overheating, conserving energy, and protecting equipment.
Used widely in:
AHUs
Heat exchangers
Radiators
Humidifiers
Fail-Open (Normally Open)? Use only for critical systems that require continuous steam flow, like:
Freeze protection
Hospital sterilizers
Critical process zones
The decision isn’t random—it’s driven by application needs and safety logic.
Engineering Tip: Always match your valve fail position with the risk and recovery logic of the system!
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