Full Bore Trunnion Ball Valve

For the full bore trunnion ball valve, the bore diameter i.e hole in the ball has the same internal diameter as the pipe.

 

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Key Specifications / Features

For the full bore trunnion ball valve, the bore diameter i.e hole in the ball has the same internal diameter as the pipe.

The following table is the minimum bore size for full bore trunnion ball valves as per API 6D specifications.

Minimum Bore of Full Bore Trunnion Ball Valves

Size Minimum Bore (in mm)
Inch DN Class 150-600 Class 900 Class 1500 Class 2500
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
16″ 400 385 373 360
18″ 450 436 423 406
20″ 500 487 471 454
24″ 600 589 570 546
26″ 650 633
28″ 700 684 617
30″ 750 735 712
32″ 800 779
34″ 850 830
36″ 900 874 855

Full bore trunnion ball valves shall be unobstructed in the fully opened position and shall have an internal minimum cylindrical opening for categorizing bore size as pecified in the following table. When pipe is used in the construction of the valves, the pipe shall meet the tolerances of the applicable pipe specifications. Obturator and seat dimensions shall meet the following table.

Note: There is no restriction on upper limit of valve bore sizes.

When there is no minum bore dimensions listed for a valve pressure class and size stated in the following table, the size and bore shall be by agreement and the manufacture shall stamp the size and bore on nameplate.

Welding-end trunnion ball valves can require a smaller bore at the welding end to match the pipe.

Trunnion ball valves with a noncircular opening through the obturator shall not be considered full bore trunnion ball valves.

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