With float in the lower position the outlet cross-section is open. Air and gases escape through theupturned immersion tube. Rising of the liquid level lifts the float and causes the outlet to be closed.
Only one movable point since the rotary slide valve is both swivel joint and shut-off device. Metallic closing system. Therefore very small wastage at highest availability.
Installation:
At the upper level of the system. Angular type: Air inlet from the bottom, lateral outlet.