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How does a VT2212 differ from a VS2212?

How does a VT zone valve differ from a VS zone valve?

Product Line: 
HVAC / Field devices

Valves and Actuator

Installation/Set-up/Application Assistance

The difference between a VT from a VS zone valve is the temperature rating. A Zone valve part number starting with "VT" , is rated for general temperature usage and NOT for use with Steam.
On the other hand, the Zone valve starting with "VS", IS rated for Steam and a higher temperature.

See table below for temperature range.

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