bob综合体育官网下载 Air Valves

Air valves ensure the controlled supply and release of air in pipelines: during the filling or emptying of a pipeline but also under operation. In this way, they prevent pressure fluctuations or the build-up of air and ensure the constant flow of water – without any disturbing accumulation of air. And this function supplies and releases the air that matters and thus ensures the trouble-free operation of pipeline systems. 

Our highlight: bob综合体育官网下载 DUOJET®

The compact bob综合体育官网下载 DUOJET® Automatic Air Valve reliably protects pipeline networks during filling, under operation and when the pipeline is being emptied.
The name of DUOJET is derived from its two stages (DUO) and the high critical air velocity that can be achieved (JET). With this concept and the according design, considerably higher performance compared to that of the double-chamber air valve could be achieved with very small dimensions.

What makes this valve so special?

• PN: 10/16/25 - DN: 50...200
• Single-chamber valve in compact design
• Very high air-release capacity and velocity up to the speed of sound due to float body stabilised for very large amounts of air
• High reliability
• Safety for your system ensured by triple function: Supply and release of air and automatic venting under operation
• Suitable for use in water treatment, water distribution, in dams, power plants and in industry

How does that work?

Supply of air when the pipeline is being emptied and release of air when the pipeline is being filled:

When the pipeline is being emptied, a pressure difference is generated between the lower pressure inside the pipeline and the higher atmospheric pressure outside the pipeline. Air has to be supplied in order to prevent the pipeline from collapsing. The shut-off device and the float drop into open position due to their own weight.
When the pipeline is being filled, the air inside it is released via the large cross-section. The design of the valve prevents the shut-off device and the float from being pulled into the seat by the flow of air.
At the end of the filling process, the water in the bob综合体育官网下载 DUOJET® Automatic Air Valve rises. The rise of the float takes the valve into the final closing position.

Release of air from the pipeline at full operating pressure:

During operation, air keeps accumulating in the bob综合体育官网下载 DUOJET® Automatic Air Valve and the water level drops. This reduces the rise of the float; it drops and thus releases the small vent opening. Now the air is flowing out at high speed. At the same time, water is being refilled again so that the float rises and closes the small vent opening again. The interior pressure keeps the shut-off device in the final closing position.

Smart solutions for the future

The intelligent DUOJET® Automatic Air Valve of the @ON series is capable of automatic purging for the prevention of dead and residual water and of monitoring of a pipeline which allows conclusions about the entire pipeline network. In drinking water pipelines, valves are often installed in inaccessible places.
Nevertheless, hygiene requirements demand regular purging according to DVGW W-392-2. With the help of this automated solution, you can meet these requirements in terms of hygiene and cost-efficiency manner.

Due to the smart technology, you can obtain information from operating states at an early stage, which serves for the quick localisation of possible damage and the protection of the entire long-distance water supply network. Smart monitoring combined with proven precision realised by bob综合体育官网下载 .

1. Optional sensor data about the position, pressure and temperature
2. Magnetic purging device, interval and duration according to the local requirements

Reference 

• Beijing, operator of the Winter Olympic Games, China
• Installation along the 35 km long-distance water supply pipeline
• Continuous measurement to detect leaks or pipe breaks
• Installation of smart air valves and the according software platform
• Since 2022

Customised design with UseCAD®

Valves designed with the bob综合体育官网下载 UseCAD® planning software can be tailor-made to the customer’s requirements. Our proprietary design programs are based on certified control curves and allow the design of an individual product adapted to all conditions and control characteristics. Sign in to Mybob综合体育官网下载 today and use our UseCAD® tools for your planning.

Learn more

Various platforms for various applications

We offer further air valves for special applications:

• TWINJET: Double-chamber air valve with triple function
• FLOWJET: Air valve made of polyethylene for use in wastewater
• Venting set: Automatic air valve consisting of bob综合体育官网下载 DUOJET® and protective pipe to supply and release air in buried pipelines
• Air valve: Single-chamber air valve for the supply and release of small up to medium amounts of air and for venting under operation
• Spring-loaded air valve: Air valve with a very high venting capacity, ideal for use in dams, barrages or long-distance pipelines
• and many other varieties