Please tell me about the fault analysis of electric flat gate valve, regulating electric flat gate valve and electric bellows gate valve.

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I would like to ask everyone, what are the differences in fault analysis between 1. Electric flat gate valve 2. Adjustable electric flat gate valve 3. Electric bellows gate valve? Compared with the regulating electric flat gate valve, the electric flat gate valve is a gate valve that can only be operated on and off. The adjustable electric flat gate valve should be able to adjust the gate to any position within the stroke according to process needs. Compared with electric flat gate valves, electric bellows gate valves are probably because the medium is more hazardous or expensive, so a bellows is added to the valve stem seal, so that there is a double seal of bellows and packing at the valve stem. The above comments are my simple understanding of these three valves with similar structures. I would also like to ask experts for advice on the differences between the three types of valves in terms of failure analysis. have a good weekend!