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Gas valves designed for gas trains for use with slightly aggressive biogases or recycling gases. The two-port valves are of the normally closed type. They can be combined with electrohydraulic actuators type SKP... or electromechanical actuators type SQX...
The VR... gas valves are designed for use with the following types of slightly aggressive gases:
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Biogases
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Waste gases
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Digester gases
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Other recycling gases
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Air
They are used primarily in gas-fired combustion plant.
The valves operate as safety shutoff valves, gas pressure governor and air / gas ratio controller.
The chemical composition or aggressiveness of each type of biogas or recycling gas is different and depends on a number of factors.
Aggressiveness increases especially:
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as the hydrogen sulfide content H2S increases
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the higher the moisture content of the gas, if condensation takes place inside the valve
If is not possible to provide general information about the resistance and life expectancy of the VR... valves when used with recycling gases. The user must decide for himself whether the valve materials are suited for use with the relevant type of recycling gas.
For safety reasons, we strongly recommend to:
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install 2 valves in series
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install a gas valve proving device
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visually inspect the valves at 6- to 12-month intervals | 
