background image

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.

Summary of Contents for DUOJET Series

Page 1: ...KAT B 1912 Edition2 01 18 Operation and Maintenance Instructions VAG DUOJET Automatic Air Valve...

Page 2: ...nstallation note 6 4 4 1 Installation position downstream from pumps 7 4 4 2 Installation in standpipes 7 4 4 3 Discharging splashing or surge water 7 4 5 Assembly instructions and fittings 8 5 Set up...

Page 3: ...ng pressure medium temperature please refer to the product rela ted documentation KAT 1912 A For any alternative operating conditions and applications the manufacturer s written approval must be obtai...

Page 4: ...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 applicat...

Page 5: ...e performance data The small venting cross section is for venting small amounts of air during operation under full internal overpressure Picture 6 Air release small cross section Installation should t...

Page 6: ...y 600 mm DN 600 1 2 3 4 1 Venting valve 2 Manually operated air inflow and release flush valve 3 Central stop valve 4 Additional flush and discharge valve 4 2 3 Water flow rate The water flow rate asc...

Page 7: ...ities during the filling process If the VAG DUOJET Automatic Air Valve is installed directly on the standpipe there is a risk of the ball closing prematurely To prevent premature closing we recommend...

Page 8: ...sidue or dirt particles are present in the pipeline they may clog the installation while the pipeline is being purged This may impair the function of the valve or even block it In particular after rep...

Page 9: ...shaft as well as drain Condition of measures for thermal insulation Condition of additional protective measures against infiltration of dirt microbes and rain water in the shaft 6 3 1 Design The desig...

Page 10: ...disassemble and remove foreign matter Internal pressure too low To achieve tightness internal pressure must be at least 3 m water column Replace gasket with a low pressure gasket 0 1 1 bar Deposits f...

Page 11: ...Edition2 01 2018 VAG GmbH Carl Reuther Str 1 68305 Mannheim Germany Tel 49 621 749 0 Fax 49 6 21 749 2153 info vag group com www vag group com...

Reviews: