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What type of packing is used for pneumatic on-off ball valves in heat transfer oil pipelines operating at 200-300 degrees?

2022-06-10View Original

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What type of packing is used for pneumatic on-off ball valves in heat transfer oil pipelines operating at 200-300 degrees? If they are control valves, they all use bellows for sealing. I found something online stating that if the purity of graphite is not sufficient, the heat transfer oil can dissolve the graphite; I’m not sure whether this is true If that’s the case, how should the packing for the ball valve be selected?

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