I have a question regarding valves
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Regarding valves in pipelines, what exactly do the terms slow-closing H and bellows-type W mean? Compared to W, which type of valve has a higher cost?
The two concepts are not comparable in terms of price; the purpose of a buffer is to delay or reduce something, while a bellows is used to improve sealing performance
Agree with the comment above; they are completely different concepts and not comparable. Typically, valves with bellows have a higher price.
Slow closing is used in check valves to reduce shock； Bellows are commonly used in gate valves, globe valves, and similar devices where high sealing requirements exist.