ไดอะแฟรม วาล์ว Saunders Diaphragm valves Type'A' (Weir Type) Product Information Weir type design available with a versatile and cost effective range of plastic and rubber linings* offering the optimum solution for customers needs in chemically demanding applications. Size Range : DN8 – DN350 (DN400, 450 & 500 available as double weir options). Pressure Range : Up to 16 bar