Valve main technical features include anti blow-out stem and valve seats design available in three different versions:
- SPE (Single Piston Effect): the seat is energized by upstream pressure only .
- DPE (Double Piston Effect): the seat can be energized by upstream pressure or by body cavity pressure .
- DUAL (SPE upstream and DPE downstream): combining the two seat designs explained above, a double barrier can be assured in case of seat sealing failure.
Main reference codes:
- 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.
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.
