17. September 2015

Always under pressure: Next generation of CNG dispenser-valves for filling trucks

Eugen Seitz AG in Switzerland is proud to announce the next generation of 1 “CNG valves for truck filling.

Eugen Seitz AG is permanently working on new, better and more economical solutions for the high pressure valves of CNG stations worldwide.

In 2014 the new valve generation ProValve Single was introduced with orifices of 8 (type 3051) and 12 mm (type 3052). Now in 2015 the new generation for orifice 18 (type 3054) is following.

Eugen Seitz AG is active in the US-market, where there is a demand for the high flow rates and fast filling times needed for truck filling. Therefore in 2014/2015 we designed a new 1 “– valve (type 3054) to get the highest flow rate possible. This valve has been released successfully on to the market in the meantime.

In comparison to the older generation of valves – and also in comparison with the products of our competitors - we have been able to increase the flow rate of the 1 “-valve (DN 18)  by 20 %, which leads to a flow rate of Kv value 7.5 m3/h or Cv 8.7 usgal/min.

The Kv / Cv values used nowadays are not precise in the case of compressed real gases. Instead of the water-based Kv-values, we prefer a mass flow model with the parameters C and b according to ISO 6358 which enables a better comparison between the physical behaviours of compressed gases at different pressures. We are able to calculate these values by simulation, but also measure these parameters in a new test bench with different pressures.

The mass flow model of ISO 6358 provides us with the mathematical relationship between mass flow flowing through the valve, and the valve inlet-, outlet pressures and the media temperature. For this purpose the valve, dependent parameters C and b must be known, for example, we are able to measure these parameters up to DN 32 mm. With C and b every user is able to determine for each pressure and temperature situation the mass flow through the valve or respectively volume-filling times. The parameters C and b are especially helpful to establish precise transient system-simulations including complex pneumatic subsystems.

Thanks to a simplified design, Eugen Seitz AG is able to achieve a higher quality at economical costs with our new type 3054.

Eugen Seitz AG is one of the world's leading independent providers of solenoid valves and system solutions in the field of CNG filling stations with pressure ranges up to 350 bar. With its head office in Switzerland and subsidiary in China, Eugen Seitz AG stands for high-tech, competitive products and high system expertise.

For more information of the complete product range please visit section Industry Sectors/AFS.

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