Ball Valve Trunnion Ball

We adhere to strict standards, fully comply with international norms, and create each product with exquisite craftsmanship. As a leader in the field of ball valve sphere manufacturing in China, we uphold a rigorous attitude, according to the national technical standards carefully designed and manufactured ball valve sphere, to ensure that every detail is accurate.

We promise to provide you with tailor-made competitive solutions that precisely fit your unique needs. With our strong supply system and advanced manufacturing facilities, we have the ability to mass produce and procure all the necessary ball valve sphere at one time, which enables us to fulfil your orders efficiently and quickly, and provide solid and reliable fittings to support your projects.

For large bores (NPS 2–60) and high pressure (up to Class 2500), the trunnion-mounted design is essential: the ball is anchored by upper and lower trunnions, so it does not move under line pressure, and the seats float against the ball to form the seal. This eliminates the high torque that a floating ball would require at large bore, and allows the valve to handle much higher pressure ratings. GFE's trunnion ball features an auxiliary seat emergency sealing system: if the soft seal is damaged, sealant can be injected to restore sealing without removing the valve. A DBB drain valve on the body allows cavity relief and flushing of accumulated sludge. For buried service, extension rods for stem, grease injection valve and drain valve are available.

•Trunnion-supported ball: upper and lower trunnions anchor the ball, eliminating ball displacement and reducing operating torque — essential for large bore and high pressure.
•Emergency sealant injection: an auxiliary sealing system allows sealant injection to restore seat sealing in emergencies; the stem can also be equipped with an emergency sealing system.
•DBB (Double Block & Bleed): a drain valve on the body relieves cavity pressure when both ends are closed, and can flush long-term sludge.
•Automatic cavity pressure relief: single-sealed valves relieve automatically; double-sealed valves use an additional relief device on the body.
•Fire-safe structure: complies with API 607 and GB/T 6899; once the soft seat is burned, metal-to-metal contact prevents large-scale leakage.
•Anti-static device: electrostatic channel between ball–stem–body discharges accumulated charge.
•Locking device: lockable at fully open and fully closed positions, preventing misoperation on outdoor or critical lines.
•Corrosion allowance & plating: valve body wall includes corrosion allowance; carbon steel stem, trunnion, ball, seat and bottom cover are electroless-plated per ASTM B733 and B656.
•Sour service (NACE MR0175): all wetted materials including fasteners are selected per NACE MR0175 for H₂S environments.
•Extension rod for buried service: stem, grease injection valve and drain valve can be extended for underground installation.
•Full-bore & reduced-bore options: full-bore for pigging; reduced-bore for weight and cost saving.

Compatible media: water, steam, oil, liquefied gas, natural gas and general industrial fluids. With sour-service material selection (NACE MR0175), handles natural gas and oil containing H₂S and CO₂. Available for cryogenic (-196℃), fire-safe (API 607) and high-temperature (up to 550℃) customization per project. Seat material options cover a wide pressure-temperature range: PTFE for standard service, PEEK / Nylon / Devlon for higher pressure and temperature, metal seal + high-temperature composite for extreme temperature.

•Body material: forged steel (A105) / cast steel (WCB) / stainless / duplex / nickel-base alloy (by media).
•Bore type: full bore (pigging-capable) or reduced bore.
•Seat seal material: PTFE / PEEK / Nylon / Devlon / PPL / PTFE+Graphite / metal seal (by pressure, temperature and medium).
•Operation: handle / worm gear / pneumatic / electric.
•End connection: flanged (RF) / butt weld (BW) / ring joint (RJ).
•Special structures: DBB drain valve, emergency sealant injection, fire-safe (API 607), anti-static, sour service (NACE MR0175), locking device, extension rod for buried service, cryogenic bonnet extension.
•Coating: G-grade international-standard paint, customized to environmental conditions.
•Customization: flange and weld-end dimensions per user drawings; DN≥1000 (40") valves designed per "Technical Conditions for Long-distance Pipeline Valves".

•Oil & Gas: large-bore isolation on transmission pipelines and stations; trunnion-mounted ball valves supplied to LUKEOIL; high-temperature ball valves with Inconel 625 overlay for Petronas; 650℃ high-temperature ball valves (F310S) for India market.
•Petrochemical / Chemical: corrosive and high-temperature medium lines with alloy body and overlay.
•Power: steam and utility systems.
•Water Treatment: large-bore general isolation; DN2000 metal-to-metal triple-offset butterfly valves supplied for water treatment in Turkey (related product line).

Manufactured under API 6D, API 607, API 608, CE, ISO 9001:2015, ISO 15848-1, OHSAS 18001 and ISO 14001 certified quality system. Hydrostatic shell and seat-leakage tests, pneumatic test (0.6 MPa), material test certificates (MTC), dimensional inspection and NDT (ultrasonic, spectrometer, hardness, impact) can be supplied per order. The company is equipped with full in-house testing capability from raw material to finished product. Sour-service valves undergo strict quality control per NACE MR0175.

Q: How do I choose between floating and trunnion-mounted ball?
A: For NPS 1/2–8 up to Class 600, the floating ball is simpler and cheaper; for larger bore (NPS 10+) or higher pressure (Class 900–2500), choose the GFE trunnion-mounted (fixed ball) series.

Q: What seat material should I choose?
A: PTFE for standard low-pressure service; PEEK or Nylon for higher pressure and temperature; Devlon for a balance of performance; metal seal + high-temperature composite for extreme temperature up to 550℃. Selection depends on medium, pressure and temperature.

Q: Can the valve be used in buried service?
A: Yes — extension rods for stem, grease injection valve and drain valve are available. Specify the extension length (center of valve channel to center of operating device) in the order.

Q: What if the soft seat is damaged in service?
A: The auxiliary emergency sealing system allows sealant injection to restore sealing without removing the valve. The stem can also be equipped with a similar emergency system.

Q: Does the valve support DBB (Double Block & Bleed)?
A: Yes — a drain valve on the body allows cavity relief when both ends are closed, achieving DBB function. It can also flush accumulated sludge.

Q: Can the valve handle sour service?
A: Yes. All wetted materials including fasteners are selected per NACE MR0175, with strict quality control during manufacturing.