API spec 6D Ball Valves, Trunnion supported ball, forged steel, welded body construction, double piston seats sealing system, anti-static device, anti-blow out proof stem, block and bleed, vent and drain fittings, self lubricating stem and trunnion bearings to assure low operating torque throughout entire valve life, fire safe design to BS 6755 parts 2 or API 6FA or API 607. Emergency sealing system at stem and seats area, if required. Safety relieve valve in case of cavity over pressure (suggested only with Liquid Hydrocarbon).