Safety valve issues
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Under what circumstances is a bellows required for a safety valve? Thank you
Bellows safety valves are commonly used in situations with large backpressure fluctuations, as well as in toxic and flammable container or pipeline systems! Haven’t used it; just heard about it, hehe!
For toxic and flammable/explosive media, safety valves with bellows are used, as they offer good sealing performance and are less prone to leakage. You can ask the manufacturer of the safety valve
What was said upstairs is correct: there are two scenarios – either the back pressure is high, but the tolerance of bellows for back pressure is generally within 30%； It is also to isolate from corrosive or toxic materials