Introducing our new single chamber air valve

AVK is proud to announce the launch of the S831 single chamber air valve, a breakthrough innovation engineered to redefine performance standards in air valve technology. Designed for demanding water and irrigation pipeline applications, the S831 delivers exceptionally high air discharge and intake capacity, setting a new benchmark for reliability and safety.

Four variants to match every application

The AVK S831 series is available in four specialised variants, ensuring optimal performance across a wide range of operating conditions:

Standard combination air valve

its innovative triple-action design efficiently expels large volumes of air, while continuously releasing smaller amounts that tend to accumulate at highpoints during normal operation. During pipeline drainage it allows air to enter, preventing the formation of a vacuum that could cause pipe collapse.

Rapid filling preventer air valve

Its advanced quadruple-action design allows air to escape with minimal flow restriction, providing a controlled release that prevents sudden pressure fluctuations and reduces the risk of water hammer, while continuously releasing smaller amounts that tend to accumulate at high points during normal operation.

Vented non-return air valve

Its advanced triple-action mechanism allows controlled air release (anti-slam), effectively preventing water splash during rapid filling, while continuously releasing smaller amounts that tend to accumulate at highpoints during normal operation. During pipeline drainage it allows air to enter, preventing the formation of a vacuum that could cause pipe collapse.

Out-only air valve

Its dual-action mechanism allows for the rapid expulsion of large volumes of air, while continuously releasing smaller amounts that tend to accumulate at highpoints during normal operation. The valve effectively prevents the back flow of air, maintaining system integrity.

Each variant is built on the same high‑performance single chamber air valve design, ensuring consistent operation and reduced maintenance over the valve’s service life.

Independently tested at FCRI – performance without compromise

To validate its exceptional capabilities, the S831 single chamber air valve was independently tested at the Fluid Control Research Institute (FCRI), one of the most reputable testing authorities in the valve industry.

The data evidently confirms that the AVK S831 exhibits superior performance compared to other standard air valves currently on the market.

• Unmatched air discharge and intake capacity (patent pending for internal design), exceeding typical air valve industry limits
• No premature float closure observed at 2 bar gauge pressure
• Valve remained stable even at sonic air velocity, without unwanted closure

In contrast, many air valves commonly available in the market, when tested at FCRI, were found to prematurely close at just 0.2 to 0.4 bar gauge pressure, with maximum air velocities limited to approximately 45 m/s.

World-class performance, proven in practice

The S831’s ability to maintain stable operation at high pressures and extreme air velocities eliminates one of the most common failure modes in conventional air valves – premature closure. This ensures safer pipeline operation, improved system efficiency, and reduced risk during filling, draining, and transient conditions.

With its tremendous flow performance, robust design, and independently verified test results, the AVK S831 single chamber air valve positions AVK as a global leader in high‑performance air valve technology.

Raising the standard for air valves worldwide

The launch of the S831 reflects AVK’s continued commitment to engineering excellence, safety, and innovation. By combining advanced design with rigorous third‑party testing, AVK once again delivers solutions that go beyond market expectations.

AVK S831 – setting a new global standard for high‑performance air valves.

AVK S831 means smaller size – bigger performance – real savings.