... 蒸汽打管机 steam pipe driver 蒸汽阀弹簧 steam valve spring 蒸汽阀盖 steam valve cap ...
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This satisfies the requirement of protecting seal spring and also never puts damage to valve on steam turbine.
这样即满足了保护密封圈的要求又不对汽轮机阀体有伤害。
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