U45SM直流式柱塞阀直流式柱塞阀最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）U45SM-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）U45SM-25C、P、RU45H-25C、P、R1520253240506580100125150200250300350400L130150160180200230290310350400480600622698787914H1802002202602803103503904304705506507508609901110W100100120140160180200240280310340400520640760900D95105115135145160180195230270300360425485550610K657585100110125145160190220250310370430490550T14141415151719192125273133364044n-φ4-144-144-144-184-184-184-188-188-238-258-2512-2512-3016-3016-3416-34)