... :2000 CE 5)operator:electric,g Sealant Injection DeviceTrunnion ball valves are provided with devices for Sealant injection, which are on ... both the stem and seat for the trunnion ball valves of DN>150mm (NPS6), and in the body cavity for ... contact with each other through the trunnion, adjusting cushion, and down-end cap, the passage of static electricity thus forms together ...