Specification
Design and manufacture: BS 1873, ASME B16.34
Face to face: ASME B16.10
Flange ends: ASME B16.5
Butt welding ends: ASME B16.25
Inspection and Test: API 598
Features
Straight pattern body design
OS & Y, Outside screw and yoke
BB, Bolted bonnet
Rising stem and handwheel
Loose disc, Choice of plg or ball