直流式柱塞閥最大的優點是介質在內流動平衡轉彎拐角少。直通式流線為梯形角式流線為角形而直流式流線為波浪形，根據對三種截止閥，流阻系數的測定DN100mm，直通式截止閥流阻系數為4.1 ，DN100mm角式截止閥流阻系數為3.8，而DN100mm直流式截止閥流阻系數為0.5，阻力大大降低。

直流式柱塞閥連接、結構尺寸：

DN(mm)

尺寸(mm)U45SM-16C、P、RU45H-16C、P、R

1520253240506580100125150200250300350400

L130150160180200230290310350400480600622698787914

H1802002202602803103503904304605506507508609801110

W100100120140160180200240270310340400520640760900

D95105115135145160180195215245280335405460520580

K657585100110125145160180210240295355410470525

T12121212131312171719212327283032

n-φ4-144-144-144-184-184-184-188-188-188-188-2312-2312-2512-2516-2516-30

DN(mm)

尺寸(mm)U45SM-25C、P、RU45H-25C、P、R

1520253240506580100125150200250300350400

L130150160180200230290310350400480600622698787914

H1802002202602803103503904304705506507508609901110

W100100120140160180200240280310340400520640760900

D95105115135145160180195230270300360425485550610

K657585100110125145160190220250310370430490550

T14141415151719192125273133364044

n-φ4-144-144-144-184-184-184-188-188-238-258-2512-2512-3016-3016-3416-34