主要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。直通式流线为梯形角式流线为角形而直流式流线为波浪形，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。
直流式柱塞阀连接、结构尺寸：
|
DN(mm) |
U45SM-16C、P、R U45H-16C、P、R |
|||||||||||||||
|
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
350 |
400 |
|
|
L |
130 |
150 |
160 |
180 |
200 |
230 |
290 |
310 |
350 |
400 |
480 |
600 |
622 |
698 |
787 |
914 |
|
H |
180 |
200 |
220 |
260 |
280 |
310 |
350 |
390 |
430 |
460 |
550 |
650 |
750 |
860 |
980 |
1110 |
|
W |
100 |
100 |
120 |
140 |
160 |
180 |
200 |
240 |
270 |
310 |
340 |
400 |
520 |
640 |
760 |
900 |
|
D |
95 |
105 |
115 |
135 |
145 |
160 |
180 |
195 |
215 |
245 |
280 |
335 |
405 |
460 |
520 |
580 |
|
K |
65 |
75 |
85 |
100 |
110 |
125 |
145 |
160 |
180 |
210 |
240 |
295 |
355 |
410 |
470 |
525 |
|
T |
12 |
12 |
12 |
12 |
13 |
13 |
12 |
17 |
17 |
19 |
21 |
23 |
27 |
28 |
30 |
32 |
|
n-φ |
4-14 |
4-14 |
4-14 |
4-18 |
4-18 |
4-18 |
4-18 |
8-18 |
8-18 |
8-18 |
8-23 |
12-23 |
12-25 |
12-25 |
16-25 |
16-30 |
|
DN(mm) |
U45SM-25C、P、R U45H-25C、P、R |
|||||||||||||||
|
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
350 |
400 |
|
|
L |
130 |
150 |
160 |
180 |
200 |
230 |
290 |
310 |
350 |
400 |
480 |
600 |
622 |
698 |
787 |
914 |
|
H |
180 |
200 |
220 |
260 |
280 |
310 |
350 |
390 |
430 |
470 |
550 |
650 |
750 |
860 |
990 |
1110 |
|
W |
100 |
100 |
120 |
140 |
160 |
180 |
200 |
240 |
280 |
310 |
340 |
400 |
520 |
640 |
760 |
900 |
|
D |
95 |
105 |
115 |
135 |
145 |
160 |
180 |
195 |
230 |
270 |
300 |
360 |
425 |
485 |
550 |
610 |
|
K |
65 |
75 |
85 |
100 |
110 |
125 |
145 |
160 |
190 |
220 |
250 |
310 |
370 |
430 |
490 |
550 |
|
T |
14 |
14 |
14 |
15 |
15 |
17 |
19 |
19 |
21 |
25 |
27 |
31 |
33 |
36 |
40 |
44 |
|
n-φ |
4-14 |
4-14 |
4-14 |
4-18 |
4-18 |
4-18 |
4-18 |
8-18 |
8-23 |
8-25 |
8-25 |
12-25 |
12-30 |
16-30 |
16-34 |
16-34 |
