Ball Valve Trunnion Mounted Welded Body | Fluitek | Philippopoulos s.a.
Ball Valve Trunnion Mounted Welded Body | Fluitek | Philippopoulos s.a.
Ball Valve Trunnion Mounted Welded Body | Fluitek | Philippopoulos s.a.
Ball Valve Trunnion Mounted Welded Body | Fluitek | Philippopoulos s.a.

Ball Valve Trunnion Mounted Welded Body | Fluitek

Fluitek Trunnion Mounted Welded Body Ball Valve

Trunnion mounted ball valve with welded body construction, designed for liquid and gas isolation in oil & gas, chemical, and industrial pipeline applications. The welded body minimizes mechanical joints, reducing potential external leakage paths, and is typically selected for pipelines where body joint leakage must be limited by design.

Design and Standards

  • Design in accordance with API 6D, API 6D SS, or ASME B16.34
  • Antistatic device per API 6D and ISO 17292
  • Ends: RF, FF, MF, or RTJ per ASME B16.5 up to 24", ASME B16.47 for 26" and above
  • Butt weld ends per ASME B16.25
  • Fire-safe tested to BS 6755, API 6FA, or API 607
  • Actuation: lever, gearbox, electric, pneumatic, hydraulic, or gas-over-oil actuator.

Seat Design

Available seat configurations:

  • SPE: seat energized by upstream pressure.
  • DPE: seat energized by upstream or body cavity pressure.
  • DUAL: SPE upstream and DPE downstream for double isolation in case of seat seal failure.

SPE/DPE/DUAL selection should consider DBB requirements, thermal expansion of trapped media, and vent/relief provisions.

Special Versions

Standard configuration is soft seated, typically gear operated. Metal-to-metal seats are available for temperatures above 250°C or for dirty/slurry service, with tungsten or chromium carbide hardfacing. Subsea design per API 6D SS / ISO 14723, stem extension for buried service, and emergency stem/seat seal injection are also available.

FAQ

When is welded body preferred over side-entry bolted body?
When minimizing external body joints is critical and installation is in pipelines with limited disassembly requirements.

What is required for specification?
NPS/DN, pressure class, full or reduced bore, BW/RF/RTJ ends, body material, SPE/DPE/DUAL seat, soft or metal seat, fire-safe, NACE, ATEX/SIL, and actuator type.

Description

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 / API 6D SS / ASME B16.34.
  • 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.

Welded body 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, Side 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 underground/ buried 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.
  • Extended SS tubing cw Floating ball valves for drain and vent connections (underground / buried)
  • Emergency stem seal injection;
  • Emergency seats sealant injection;
  • Welded glandplate.

Certifications

Fluitek SRL Company Quality Policy 11-2022 – ENG