API 6D Minimum Bore for Full Opening Valves

 NPS   DN    Minumum Bore (mm)    
 Class 150 to 600  Class 900 Class 1500  Class 2500 
1/2 15 13 13 13 13
3/4 20 19 19 19 19
1 25 25 25 25 25
1-1/4 32 32 32 32 32
1-1/2 40 38 38 38 38
2 50 49 49 49 42
3 80 74 74 74 62
4 100 100 100 100 87
6 150 150 150 144 131
8 200 201 201 192 179
10 250 252 252 239 223
12 300 303 303 287 265
14 350 334 322 315 292
16 400 385 373 360 333
18 450 436 423 406 374
20 500 487 471 454 419
22 550 538 522 500 -
24 600 589 570 546 -
26 650 633 617 594 -
28 700 684 665 641 -
30 750 735 712 686 -
32 800 779 760 730 -
34 850 830 808 775 -
36 900 874 855 819 -
38 950 925 904 - -
40 1000 976 956 - -
42 1050 1020 1006 - -
48 1200 1166 1149 - -
54 1350 1312 - - -
56 1400 1360 - - -
60 1500 1458 - - -

 

                                          Minumum Bore In Inch

 NPS   DN    Minumum Bore (In Inch)    
 Class 150 to 600  Class 900 Class 1500  Class 2500 
1/2 15 0.50 0.50 0.50 050
3/4 20 0.75 0.75 0.75 0.75
1 25 1.00 1.00 1.00 1.00
1-1/4 32 1.25 1.25 1.25 1.25
1-1/2 40 150 150 1.50 1.50
2 50 1.94 1.94 1.94 1.69
3 80 2.94 2.94 2.94 2.44
4 100 3.94 3.94 3.94 3.44
6 150 5.94 5.94 5.69 5.69
8 200 7.94 7.94 7.56 7.06
10 250 9.94 9.94 9.44 8.81
12 300 11.94 11.94 11.31 10.44
14 350 13.19 12.69 12.44 11.50
16 400 15.19 14.69 14.19 13.13
18 450 17.19 16.69 16.00 14.75
20 500 19.19 18.56 17.88 16.50
22 550 21.19 20.56 19.69 -
24 600 23.19 22.44 21.50 -
26 650 24.94 24.31 23.38 -
28 700 26.94 26.19 25.25 -
30 750 28.94 28.06 27.00 -
32 800 30.69 29.94 28.75 -
34 850 32.69 31.81 30.50 -
36 900 34.44 33.69 32.25 -
38 950 36.44 35.63 - -
40 1000 38.44 37.63 - -
42 1050 40.19 39.63 - -
48 1200 45.94 45.25 - -
54 1350 51.69 - - -
56 1400 53.56 - - -
60 1500 57.44 - - -


 Note:

Full opening valves shall be unobstructed in the fully opened position and shall have an internal minium cylindrical opening for categorizing bore size as specified in above table. When pipe is used in the construction of the valves, the pipe shall meet the tolerances of applicable pipe specification. Obturator and seat dimensions shall meet the above talbe.

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