TOP ENTRY TRUNNION BALL VALVES
High-performance valves for oil & gas, chemical, petrochemical, water and power applications
Negri Fratelli Top Entry trunnion-mounted ball valves are designed to ensure maximum safety, reliability and ease of maintenance over time. The Top Entry configuration allows direct access to the internal components, facilitating inspection, scheduled maintenance and replacement of seats or seals without removing the valve from the line, resulting in a significant reduction in plant downtime.
These valves are used in a wide range of applications, including industrial plants, gas and fluid distribution networks, pipelines and refineries, water treatment systems and energy projects, where operational continuity and long service life are essential requirements.
- Top Entry design 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 with antistatic device
- Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
- Testing – hydrostatic and pneumatic tests to API 6D. Other testing upon request
- Firesafe certified design – API 607 and ISO 10497 compliant
- Double piston effect seats, DIB-1 / DIB-2 seats, 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
- Versions for cryogenic service
- Locking devices
- Customized face-to-face dimensions
- Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN ISO 14313, EN ISO 17292
- Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
- Temperature range: –29°C to +160°C (other ranges on request)
- Size range: up to DN 900 (36”)
- End connections: flanged, butt-welding, hub
- Body and closures: in carbon and stainless steel, obtained from forging, bar stock, or casting
- Ball and seat rings: ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
- Seat inserts: soft (thermoplastic polymers such as RPTFE, Devlon, Peek, or PCTFE) or metal (Tungsten/Chrome Carbide coating), other materials on request
- Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals (other materials and solutions available on request)
- Design & Construction: API 6D
- Firesafe: API 607, EN ISO 10497
- Pressure Equipment Directive (PED): 2014/68/EU
- ATEX certification: 2014/34/EU