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形角式流线为
形而直流式流线为
形，根据对三种截止阀，流阻系数的测定DN100mm，直通式截止阀流阻系数为4.1 ，DN100mm角式截止阀流阻系数为3.8，而DN100mm直流式截止阀流阻系数为0.5,阻力大大降低。
