A thermostatic vent in the top of the trap allows free passage of air during start-up, and closes near saturation temperature. Condensate fills a float chamber, causing a float to rise, and through a lever mechanism pulls a valve off its seat and opens the orifice of a discharge valve.
How do you adjust a steam radiator vent valve?
https://www.youtube.com/watch?v=y0VQOZqiw7U
What is a water vent valve?
401479 Water Vent Valve. For removing air from convectors, baseboard and wall radiation. Safety drain connection for discharging moisture.
What is the purpose of vent valve?
The vent valve is a device installed to prevent negative pressure (e. g. as a result of surge pressures) in a piping system. Vent valves are also installed at the highest points in a piping system downstream of shut-off elements or pumps, and at the highest points in domestic installation systems.
What happens when an air admittance valve fails?
Failure to bring air back into the pipes can result in a vacuum (causing slow draining and gurgling), or even the siphoning of water out of traps (allowing sewer gases to enter the home through drain openings).