Trunnion Ball Valves

Trunnion Ball Valve. Trunnion Design is simply the use of upper and lower supports to retain the ball under pressure. The name "trunnion" evolves from the past as this was used to support a cannon. A ball valve trunnion essentially increases the safety and usability of a ball valve. Trunnion Ball Valve can be piped in either direction allowing applications with reversing flow. A further benefit of the trunnion design is that it allows the valve to act as a true connection. The downstream piping can be disconnected under full upstream pressure.