B21X-16T Brass Automatic Air Vent Valve is widely used in manifolds, heaters, underfloor heating, air conditioning and water supply systems. When water passes through the exhaust valve, the float inside the valve rises and closes the vent hole, preventing water from flowing out of the vent hole. Automatic exhaust valve is used in independent heating system, centralized heating system, radiant floor heating system, solar heating system, heat pump system, central air conditioning, heating boiler and so on.
Product Parameters
Product Model | B21X-16T |
Valve Body Material | Brass |
Nominal Pressure | ≤1.6Mpa |
Applicable Media | Water, Gas, etc. |
Applicable Temperature | ≤80°C |
Product Size Reference

Nominal Diameter | SIZE | L | H |
DN15 | 1/2 | 21 | 72 |
DN20 | 3/4 | 26 | 73 |
DN25 | 1 | 33 | 73 |

















