Cv Value is closely related with disc structure. Two regular type of disc are listed as below for reference when selecting Cv Value. Fig.1 Split Stem DesignFig. 2 Taper Pin Design & Throughout Stem Pinless Design

Click to enlarge the drawing
Cv Value for Split Stem Design (Fig.1)
Valve Size |
Cv Value when valve in different opening angle |
inch |
mm |
10¡ã |
20¡ã |
30¡ã |
40¡ã |
50¡ã |
60¡ã |
70¡ã |
80¡ã |
90¡ã |
1 1/2 |
40 |
0.1 |
3 |
6 |
14 |
20 |
38 |
53 |
62 |
73 |
2 |
50 |
0.2 |
5 |
9 |
17 |
27 |
53 |
70 |
115 |
145 |
2 1/2 |
65 |
0.4 |
8 |
15 |
26 |
42 |
83 |
105 |
175 |
225 |
3 |
80 |
0.6 |
12 |
22 |
38 |
63 |
125 |
160 |
260 |
325 |
4 |
100 |
0.8 |
17 |
42 |
73 |
120 |
235 |
305 |
510 |
590 |
5 |
125 |
2 |
45 |
88 |
155 |
250 |
490 |
625 |
1000 |
1125 |
6 |
150 |
3 |
89 |
145 |
250 |
410 |
800 |
1030 |
1650 |
1950 |
8 |
200 |
4 |
148 |
250 |
420 |
700 |
1300 |
1750 |
2725 |
3250 |
10 |
250 |
5 |
232 |
390 |
670 |
1150 |
2150 |
2750 |
4300 |
5000 |
12 |
300 |
6 |
342 |
550 |
1000 |
1600 |
3100 |
4050 |
5000 |
7500 |
Cv Value for Taper Pin Design & Throughout Stem Pinless Design (Fig.2)
Valve Size |
Cv Value when valve in different opening angle |
inch |
mm |
10¡ã |
20¡ã |
30¡ã |
40¡ã |
50¡ã |
60¡ã |
70¡ã |
80¡ã |
90¡ã |
1 1/2 |
40 |
0.06 |
3 |
7 |
14 |
25 |
36 |
51 |
70 |
76 |
2 |
50 |
0.1 |
5 |
12 |
24 |
45 |
64 |
90 |
125 |
135 |
2 1/2 |
65 |
0.2 |
8 |
20 |
37 |
65 |
98 |
144 |
204 |
220 |
3 |
80 |
0.3 |
12 |
22 |
39 |
70 |
116 |
183 |
275 |
302 |
4 |
100 |
0.5 |
17 |
36 |
78 |
139 |
230 |
364 |
546 |
600 |
5 |
125 |
0.8 |
29 |
61 |
133 |
237 |
392 |
620 |
930 |
1022 |
6 |
150 |
2 |
45 |
95 |
205 |
366 |
605 |
958 |
1437 |
1579 |
8 |
200 |
3 |
89 |
188 |
408 |
727 |
1202 |
1903 |
2854 |
3136 |
10 |
250 |
4 |
151 |
320 |
694 |
1237 |
2047 |
3240 |
4859 |
5340 |
12 |
300 |
5 |
234 |
495 |
1072 |
1911 |
3162 |
5005 |
7507 |
8250 |
14 |
350 |
6 |
338 |
715 |
1549 |
2761 |
4568 |
7230 |
10844 |
11917 |
16 |
400 |
8 |
464 |
983 |
2130 |
3797 |
6282 |
9942 |
14913 |
16388 |
18 |
450 |
11 |
615 |
1302 |
2822 |
5028 |
8320 |
13168 |
19752 |
21705 |
20 |
500 |
14 |
791 |
1674 |
3628 |
6465 |
10698 |
16931 |
25396 |
27908 |
22 |
550 |
17 |
965 |
2042 |
4426 |
7887 |
13052 |
20655 |
30983 |
34048 |
24 |
600 |
22 |
1222 |
2587 |
5605 |
9989 |
16528 |
26157 |
39236 |
43116 |
26 |
650 |
26 |
1434 |
3036 |
6578 |
11723 |
19397 |
29263 |
46047 |
50600 |
28 |
700 |
30 |
1663 |
3522 |
7630 |
12599 |
20036 |
30482 |
46899 |
58696 |
30 |
750 |
35 |
1912 |
4050 |
8142 |
13152 |
20411 |
31226 |
47562 |
63328 |
32 |
800 |
45 |
2387 |
4791 |
8736 |
13788 |
20613 |
31395 |
48117 |
68250 |
34 |
850 |
51 |
2697 |
5414 |
9872 |
15580 |
23293 |
35476 |
54372 |
77123 |
36 |
900 |
60 |
3021 |
6063 |
11055 |
17449 |
26086 |
39731 |
60895 |
86375 |
40 |
1000 |
84 |
4183 |
8395 |
15307 |
24159 |
36166 |
55084 |
84425 |
119750 |
42 |
1050 |
93 |
4601 |
9235 |
16838 |
26575 |
39783 |
60592 |
92868 |
131725 |
48 |
1200 |
121 |
5981 |
12001 |
21890 |
34548 |
51718 |
78770 |
120728 |
171243 | |