Valves can also be furnished with flange bolt holes drilled for through bolting, except in the chest area.
阀门也可以配置法兰螺栓孔，用于贯穿式螺栓，但不能穿过阀腔区域。
2
Do not rely on the flangebolting to support the valve or connecting pipeline.
不能依赖法兰螺栓来支撑阀门或连接管道。
3
Girth flangebolting shall be of stud bolt type, threaded full length, and at least M16 for flange of 600 mm and smaller inside diameter and at least M20 for over 600 mm inside diameter flange.