| 2½-inch valves are machined from 3-inch castings, but the flange are machined to 2½-inch dimensions.
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* On class 150, 8-inch valves, the two top holes in the flanges are tapped for ¾ -10UNC-2B threads. |
** On 8-inch valves, cover bolts are arranged around a 7.63 dia. bolt circle. |