Even the smaller AV619 version is impressive. It blows off unwanted overpressure in a very low range from 5 to 500 mbar with the greatest reliability and consistency. As a comparison: Standard valves corresponding to the Pressure Equipment Directive 97/23/EEC applicable for this product group often only respond after an overpressure a hundred times greater. The new AV919 also masters these low setting pressures, while keeping a blow-off volume ten times greater at 967 m³/h under control. The opening pressure of the new development, still very compact despite being around 90 x 170 mm larger, is set precisely at the factory. The manufacturer can provide a TÜV (Technical Inspectorate Authority) test on request. This component weighing only around 1500 grams can be used with all technical gases in a wide temperature range from -40 to +300 °C.
Safety valves with an opening pressure below 0.5 bar are regarded as a technical challenge with the result that many systems work less accurately as the pressure decreases. Yet reliable functioning is not only crucial for economic viability but also for safety: Sensitive and expensive systems as well as their tanks and pipes for gas supply are relieved prior to reaching their operating limits, should the gas pressure rise unexpectedly. WITT is one of the few manufacturers with a complete programme comprising mixing, metering and control systems along with analysis and safety technology for almost all gas plants.
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