IG541 fire suppression laboratory and a equivalent length of pipe fittings measuring system were established.
设计并建立了IG541管道配件当量长度测量系统和IG541气体灭火实验系统。
Full-Port ball valves provide pressure drop equal to equivalent length of pipe, and even slightly better than gate valves.
不缩径全流道球阀具有不影响整个管道压降的性能，在此方面，甚至比闸阀性能更加优异。
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