VAG Operation and Maintenance Instructions • 4
3 Product features
3.1 Features and function description
The VAG DUOJET
®
Automatic Air Valve is a two-stage single-
chamber air valve for the automatic aeration and venting of pipe-
lines.
The standard version is delivered with (cf. Picture 2):
• Inner parts made of stainless steel 1.4571 (Except DN 50/PN
16: float made of plastic)
• Screw connection in the outlet (possible to mount to fittings,
elbows, insect protection)
Picture 2: VAG DUOJET
®
standard version
As an alternative, a version with gate valve (VAG DUOJET
®
S) as
well as with an individually calculated orifice plate (VAG DUOJET
®
Anti-Surge) is available (cf. Picture 3).
Picture 3: VAG DUOJET
®
-S and VAG DUOJET
®
Anti-Surge Automatic Air Valve
3.2 Applications
The VAG DUOJET
®
Automatic Air Valve can be used with the fol-
lowing media:
• Water
• Raw and cooling water
The VAG DUOJET
®
Automatic Air Valve is not suitable
for seawater, sewage or waste water.
For information about the corresponding temperature
limits, please refer to the product-related technical documentati-
on (KAT-A 1912).
In case of alternative operating conditions and applications, ple-
ase consult the manufacturer.
3.3.3 Venting performance data
The large venting cross-section is for venting large amounts of air
when starting up the pumping station.
3.3 Performance limits
3.3.1 Minimum pressure
The minimum pressure for sealing the venting cross-sections is
0.3 bar.
3.3.2 Air inflow performance data
The large aeration cross-section is for aerating with large amounts
of air when switching off the pumping station.
Picture 4: Air inflow - large cross-section
Picture 5: Air release – large cross-section
Do not remove the protective caps of the connections / flanges
and the packaging materials until immediately prior to assembly
into the pipeline.
The valve can be stored in ambient temperatures ranging from
-20 °C to + 50 °C (protected by adequate covers). If the valve is
stored at temperatures below 0 °C, it should be warmed up to at
least +5° C before installation and before it is put into operation.