AVDT — Air Vent with Dial Thermometer
Thermostatic air vent with an integral dial thermometer, so air removal can be confirmed rather than assumed.
Product overview
A thermostatic air vent that discharges air and non-condensable gases from steam spaces, fitted with a dial thermometer that shows the temperature at the vent point — turning an invisible function into a readable one.
The problem it solves
Air entering a steam space on start-up, or accumulating during operation, forms an insulating film on the heat-transfer surface. The plant sees low output at correct steam pressure, and the usual response is to raise the pressure, which does not address the cause.
Working principle
A thermostatic element held open when cool allows air to escape as the space fills. As steam reaches the element it expands and closes the vent. The dial thermometer reads the temperature at that point, so the difference between saturation temperature and the reading indicates whether air is still present.
Applications
- Steam headers and mains
- Jacketed vessels and reactor jackets
- Heat exchangers and calandria
- Start-up air removal and ongoing venting verification