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Question:

What is the dish yellow in the valve?

It seems to be used on the stem nut. Yes, thank you. Ah, thank you

Answer:

What's the valve? You should say "butterfly spring". If it is, it will fix some parts
It is mounted behind the seat and plays a key role in the thrust and closure of the valve seat.
Disc spring: not used on valve stem and nut. Usually, disc springs are used on hard sealing ball valves.

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