172-65528A-01 (VS3-E/VS3-P/VS3-EP) 8 Jul 2015
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 polished 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
1.
When water starts to flow through the
piping, air trapped within the piping is
pushed along by the water pressure and
enters the air vent. At first, because the
float is positioned in the lower part of the
air vent, the valve is fully open and the air
passes through the valve seat and is
discharged rapidly through the vent.
2.
When the air has been discharged and
water begins to enter the air vent, the
float starts to rise due to buoyancy. This
pushes it upwards against the valve
opening, thus closing the air vent.
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.
When more air is trapped in the air vent
due to the inflow of water having closed
the valve, the water level in the air vent is
forced down and consequently the level of
the float falls, opening the valve. Air can
now again escape through the air vent,
and as it does so the level of the water
rises, pushing the float upwards again to
close the valve. In this way the VS3 series
automatically adjusting air vents
constantly respond to the flow of air.
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).
Valve seat
Valve seat
Valve seat
Air
Air
Water
Water
