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In a gas detection plant is it better to install a safety electrovalve normally open or normally closed?

The rule in force doesn't specify which is the best choice, so it is all up to the technician. The main difference between a normally closed valve with manual reset and a normally open one is that the first is "intrinsic safety" that is it can guarantee the gas leakage closing even without electricity and so even when the gas detection system is not working.

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