Trunnion Mounted Ball Valve

A trunnion mounted ball valve fixes the ball on upper and lower trunnion shafts, so the ball does not float under line pressure. The fixed stem cuts operating torque sharply compared with a floating ball, which is why this design is the standard choice for large-bore and high-pressure pipelines. A double-seat, bidirectional body provides reliable shut-off in either flow direction, and each seat ring carries a self-cleaning scraping edge that wipes solids off the ball surface on every cycle. The full-bore streamlined port keeps pressure drop low and capacity high, and the stem uses a multi-stage anti-blow-out design for high-pressure service. Manual, pneumatic, or electric actuators can be fitted, turning the valve into an automated shut-off or regulating element for large industrial lines.

Trunnion ball valves on cross-country pipelines and large chemical units are rarely off-the-shelf: bore size, pressure rating, end flange standard, and cavity relief all follow project specifications. We manufacture from customer drawings, matching body wall thickness, trunnion sizing, and seat material to the actual Class rating and medium - crude oil, gas, or high-temperature steam - so the valve drops into the intended line without rework. Foundry and machining sit under one roof, so special castings for non-standard sizes are scheduled directly against the project's delivery milestone.

Long-distance oil and gas trunk lines.

Trunnion mounting keeps torque low on large bores, while bidirectional double-seat shut-off and fire-safe design meet typical pipeline isolation expectations under high pressure.

Large chemical and power plant high-pressure piping.

Fixed-ball geometry handles high differential pressures that would seat-load a floating ball beyond its torque limit; alloy bodies in duplex or Hastelloy suit aggressive process fluids.

Large storage tank inlet/outlet and high-temperature steam service.

Self-cleaning seat scrapers keep the ball free of sediment, and the wide temperature range (-46 to 550 C) covers both cryogenic and superheated duties.

• Body material: WCB, LCB, 304, 316L, duplex, or Hastelloy.
• Pressure rating: PN16-PN160 / Class150-Class2500.
• End connection and face-to-face: per customer drawing or pipeline standard.
• Actuation: manual gear, pneumatic scotch-yoke, or electric actuator.
• Seat: soft seat or metal seat per shut-off requirement. API-6D and fire-safe construction available.

Standard export packing with corrosion protection on machined ends. Each valve undergoes 100% pressure testing before dispatch. Pressure-test videos, packing photos, and packing list are shared during production, and full customs documentation is supplied for export orders.

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