Automatic Air Vent/ Release Valve is used in hot and cold water system to eliminate entrapped air in water lines. The Air Vent/ Release Valve can prevent air locking due to filling of system or while priming of pump systems to increase thermal efficiency. The Air Vent/ Release Valve is fitted with check valve to prevent air being drawn back into system or water escaping from port event. Automatic Air Vent/ Release Valve can function in a temperature range of 90 Degree C.