Check these ball valve different dimension:
A:
http://www.kojocn.com/ball-valve/floating-ball-valve-300.htm
http://www.kojocn.com/ball-valve/cast-turnnion-ball-valve-1500.htm
Class 150 Floating Ball Valve L-RF=457mm
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B:
http://www.flowserve.com/files/Files/Literature/Products/Flowcontrol/McCannaMARPAC/MMABR1005.pdf

ANSI CLASS 150 Regular Port Flanfed B=292.1mm
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Feng Tsai