FULLY WELDED TRUNNION BALL VALVES
High-performance valves for oil & gas, water, and energy applications
Negri Fratelli fully welded trunnion ball valves are designed for maximum safety, reliability, and long-term performance. Their fully welded construction eliminates leaks and minimizes maintenance, making them ideal for both buried and above-ground installations.
These valves are suitable for a wide range of applications, including gas and hydrogen distribution and transmission pipelines, compressor and measuring stations, gas storage facilities, industrial plants, and district heating networks.
- Fully welded body
- Full or reduced bore options
- Bi-directional sealing with Double Block & Bleed (DBB) design
- Solid ball with a cylindrical bore and no internal cavities
- Single-piston seats with self-relieving effect
- Anti-ejection stem
- Multiple actuation options – manual lever, square or gearbox (removable or fixed, with handwheel or 90° deviation), or actuator-operated
- Testing – hydrostatic and pneumatic tests to API 6D, EN 13774, EN 14141. Other testing upon request
- Firesafe certified design – API 607 and ISO 10497 compliant
- Antistatic device
- Double piston effect seats, DIB-1 / DIB-2 seats, Primary Metal Secondary Soft (PMSS) or metal-to-metal sealing
- Stem and seat sealant injection systems
- Drain and vent devices, complete with ball valve and/or plug, for DBB testing and maintenance
- Stem extensions – fixed, adjustable, or telescopic for underground use
- Pipeline vent devices, complete with pre-assembled vent ball valves
- Locking devices
- Custom pup pieces or specified end-to-end dimensions
- Pre-installed polyethylene ends
- Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN 13774, EN 14141, EN ISO 14313, EN 13942, EN ISO 17292
- Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
- Temperature range: –10°C to +70°C (other ranges on request)
- Size range: up to DN 900 (36”)
- End connections: Butt-welding, flanged, socket-welding, threaded, or mixed types
- Body and closures: carbon steel, obtained from forging, bar stock, or pipe
- Ball and seat rings: standard ASTM A350 Gr. LF2, other materials on request
- Seat inserts: soft (delta ring in FKM, HNBR, or thermoplastic polymers such as RPTFE, Devlon, or Peek) or metal (Tungsten/Chrome Carbide coating), other materials on request
- Seals: FKM, HNBR, FFKM, EPDM, graphite (other materials and solutions on request)
- Design & Construction: API 6D, EN 13774
- Firesafe: API 607, EN ISO 10497
- Pressure Equipment Directive (PED): 2014/68/EU
- ATEX certification: 2014/34/EU