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这个没有详细规范，都是公司的管理制度。一般紧急切断阀都是带执行机构的，早期大多是国产，国产的切断阀质量不行，加旁通的目的就是测试切断阀是否能正常运动。后来许多企业都从国外进口阀门，国外的质量高，所以有部分设计院就把旁路取消，反正老外说能做到百分百
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