Specification NotesValves are manufactured in accordance with BS 5154 PN16 for Series B ratings, with ‘short’ face-to-face. Design incorporates disc holder retained on stem by a threaded ring. Body seat is integral of the semi-crown type. End flanges conform to BS 4504 section 3.3 with flat face and are normally supplied drilled. Note: Users attention is drawn to BS 4504 Section 3.3 clause 8 regarding types of gaskets and mating flanges to be used with metric flanged valves. This valve is not suitable for use on Group 1 gases or unstable fluids, as defined by the Pressure Equipment Directive 2014/68/EU.