U45***直流式柱塞阀直流式柱塞阀***大的优点是介质在内流动平衡转弯拐角少。直通式流线为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。直流式柱塞阀：一、主要连接、结构尺寸DN(mm)尺寸（mm）U45***-16C、P、RU45H-16C、P、R1520253240506580100125150200250300350400L130150160180200230290310350400480600622698787914H1802002202602803103503904304605506507508609801110W100100120140160180200240270310340400520640760900D95105115135145160180195215245280335405460520580K657585100110125145160180210240295355410470525T12121212131312171719212327283032n-φ4-144-144-144-184-184-184-188-188-188-188-2312-2312-2512-2516-2516-30DN(mm)尺寸（mm）U45***-25C、P、RU45H-25C、P、R1520253240506580100125150200250300350400L130150160180200230290310350400480600622698787914H1802002202602803103503904304705506507508609901110W100100120140160180200240280310340400520640760900D95105115135145160180195230270300360425485550610K657585100110125145160190220250310370430490550T14141415151719192125273133364044n-φ4-144-144-144-184-184-184-188-188-238-258-2512-2512-3016-3016-3416-34)