172-65391MA-08 (VS1A) 7 Oct 2021
4
Features
1. Precision-ground float and 3-point seating provide the tightest seal.
2. All stainless steel construction provides outstanding corrosion resistance.
3. The air vent has no hinges or levers: the only moving part is the precision-ground
float, which eliminates concentrated wear and provides long service life.
4. Simple construction with few parts allows for easy maintenance.
5. The air vent is small and light.
Operation
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
1. When water is transported, air inside the
piping is forced into the air vent by the
pressure of the flow.
The float inside the air vent is in the lower
position, thus the valve is fully open and
allows the air that enters the air vent and fills
the area around the float to then be
discharged.
2. When discharge is completed, as water
flows into the air vent, the rising water level
causes the float to rise and to close the
valve.
If there is a rapid rise in water level (caused
by rapidly opening a shut-off valve, etc.), a
small amount of water may leak with
discharged air immediately before the air
vent closes.
3. Once the valve closes after discharging
initial air, it will not open again, even if air
accumulates inside the air vent, until internal
pressure drops to near atmospheric
pressure.
4. When draining the piping, the air vent
automatically opens to introduce air and
remove water more easily (preventing a
vacuum from forming in the piping).
Air
Water
