ACS Gas Training - Controls - Understanding How Controls Work - Russell Holdsworth 

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If there is an interruption to the gas the flame will go out, if gas is reestablished it will flow into the burner unlit through the bypass. It's unlikely to create an explosive atmosphere though because of ventilation requirements for cookers. Saying that a thermoelectric FSD is better than a liquid expansion because it will shut off gas to the burner in case of flame failure.

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A liquid expansion flame supervision device never fully shuts off gas flow (unlike other FSDs). If the flame fails, the valve partially closes to a very low flow rate that should not cause explosive build-up of unburnt gas. When you light the oven, you see a very low flame. Then, once the liquid expansion phial heats up, the flame suddenly goes to full height. The low flow rate can be thought of as a bypass rate for the FSD, but do not confuse it with the oven thermostat bypass which takes over when the oven reaches setting temperature. They are two different things.

i haven’t done one for a lot of years. Thanks.

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The main gas valve is closed but there is a small bypass which a small amount of gas goes through

yes

I agree to a certain extent but it’s still good to know just in case. Thanks.

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SUPERVISION, not supervising

They're still in the exams and practical assessment. They're obviously a key aspect of the safety of an appliance. For reassessments, they just shorten the list of ones you have to cover.

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