Trunnion Mounted Ball Valve

The ball of the trunnion ball valve is fixed and does not move after being pressed. The CENTROFLOW Trunnion Mounted Ball Valve made in China has a floating valve seat. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure the sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves.
 
CENTROFLOW Trunnion Mounted Ball Valve main technical features: include 

• Standard design can be in accordance with API 6D / ASME B16.34 / API 6A.
• Antistatic design as per API 6D and ISO 17292.
• Valve ends can be flanged (RF, FF, MF or FF, RTJ), according to ASME B16.5 (up to 24”) or ASME B16.47 (26” and above), Butt-Welding according to ASME B16.25.
• Fire Safe according to BS6755 / API 6FA / API 607, since each sealing point is provided by a secondary fire-safe seal in graphite. Valve soft seats also are provided with secondary metal-to-metal seal in case of fire and anti blow-out stem.

Trunnion ball valves can be manual operated (lever or gearbox depending on valve size), but also equipped with an actuator (electric, pneumatic, hydraulic, gas-over-oil etc.).
Standard design is soft seated and gear operated, the following special designs are also available:

• METAL-TO-METAL SEAT: for high temperatures (larger than 250°C) or dirt/slurry service, hard facing on seat and ball contact surfaces (Tungsten or Chromium Carbide).
• SUBSEA DESIGN: for subsea applications, Top Entry Ball valves are provided with additional seals, blind nuts, subsea actuators etc. Valve design according to API 6D SS and ISO 14723.
• STEM EXTENSION. For special applications the operator (lever/gear/actuator) can be lifted by an extension fixed to valve body, and a joint coupled to the stem.

The following optional features are also available:

• Locking device.
• Floating ball valves for drain and vent connections (if prescribed by Customer requirements)
• Emergency stem seal injection;
• Emergency seats sealant injection;
• Weld overlay (316 or Inconel 625) on dynamic sealing areas or in all wetted parts.
• Certified lifting devices;
• Seal welded fittings.