... exhaust valve casing 排气阀壳 exhaust inlet casing 废气进气壳 exhaust outlet casing 废气出口壳 ...
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exhaust outlet casing steam valve 排汽阀
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If the exhaust system is under a vacuum, the casing must be warmed by gradually introducing the steam, after opening the exhaust valve.
如果排气系统处于真空下，必须在打开排气阀后，逐渐引蒸汽来加热壳体。
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