You may have to search for solenoid "gas" valves. They make them for flammable or non-flammable gasses. Solenoid air/gas or liquid valves for industrial or lab use usually aren't cheap. 
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You may have to search for solenoid "gas" valves. They make them for flammable or non-flammable gasses. Solenoid air/gas or liquid valves for industrial or lab use usually aren't cheap.