Ball Valves Β· Trunnion Mounted Ball Valves
Forged Trunnion Ball Valves
Forged trunnion ball valves anchor the ball on top and bottom trunnions so line pressure cannot push it off its seat, which is what lets the design hold tight shutoff on large bore and high pressure lines. The collected benchmark page covers DN50 to DN1400 in Class 150 to Class 1500, with a wide ASTM body/ball grade list out to duplex F51/F53, metal-to-metal seat options, fire-safe execution to API 607 and lever, gear, pneumatic or electric operation.
Part of the Trunnion Mounted Ball Valves family
Last updated: 2026-11
Specifications
| size range | DN50 to DN1400 |
|---|---|
| pressure class | Class 150 to Class 1500 |
| body materials | ASTM A105, A182 304, A182 316, A182 304L, A182 316L, A182 F51, A182 F53 |
| body materials | WCB, LCB, LCC, WC1, WC6, WC9, C5, C12, CF8, CF8M, CF3, CF3M |
| seat materials | PTFE, RTFE, Nylon, Metal to Metal |
| ball materials | ASTM A105, A182 304, A182 316, A182 304L, A182 316L, A182 F51, A182 F53 |
| end connections | ANSI B16.25 |
| operation | Lever, Gear Operated, Pneumatic Actuated, Electric Actuated |
| design standards | API 6D, API 608, BS5351, ASME B16.34 |
| testing standards | API 6D, API 598 |
| face to face | ASME B16.10, API 6D, DIN 3202 |
| fire safe design | API 607 |
| flange standards | ANSI B16.5 (2"-24"), MSS SP-44 / ASME B16.47 (over 26") |
Application & selection guidance
Size for the bore first β DN50 to DN1400 is trunnion territory, not floating β then the pressure class (Class 150 to 1500 on the benchmark page), then seat selection: PTFE-family and nylon seats for general duty, metal-to-metal for high temperature or abrasive service. Material selection runs from ASTM A105 carbon steel through A182 304/316/L grades to duplex F51 and super duplex F53 for chloride duty. Fire-safe API 607 execution applies in hydrocarbon service. Flange dimensions follow ANSI B16.5 up to 24 inch and MSS SP-44 / ASME B16.47 above.
Frequently asked questions
When do I need a trunnion-mounted ball valve instead of a floating one?
As bore and pressure grow, the line pressure pushing a floating ball against its seat produces seat loads and operating torque that stop being practical. The trunnion design absorbs that load on the trunnions, which is why the benchmark execution spans DN50 to DN1400 and Class 150 to 1500. A common selection boundary: floating executions stay economical at smaller bores, and large-diameter or high-class lines go trunnion. The two are not interchangeable substitutions β confirm the duty case at quotation.
What do the duplex grade options (F51, F53) mean for selection?
The benchmark page lists A182 F51 (duplex) and F53 (super duplex) among body and ball materials. These duplex stainless grades combine higher strength with chloride and pitting resistance, which makes them relevant for seawater, brine and aggressive chloride service where standard 304/316 grades would pit. Choose them against the chloride content and temperature of the medium, and state the grade explicitly in the inquiry so the certificate matches.
What information is needed to quote a forged trunnion ball valve?
Provide nominal size (DN50 to DN1400 range), pressure class (Class 150 to 1500), body and seat material grades, end connection (flanged per B16.5/B16.47 or butt weld per B16.25), operation (lever, gear, pneumatic or electric), plus medium, temperature, and whether fire-safe API 607 execution is required. Add face-to-face limitation if replacing an installed valve.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order β state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage β seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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