Ball Valves Β· Trunnion Mounted Ball Valves
Casting Trunnion Ball Valves
Casting trunnion ball valves carry the floating principle one step further: the ball is fixed by trunnions top and bottom, so line pressure cannot push the ball into the downstream seat and operating torque stays predictable at large bore and high class. The cast A216 WCB and A351 CF8/CF8M executions on the benchmark page span DN100 to DN700 at Class 150 to 2500 with a PN marking for metric lines, -30 to +220 C, RF, RTJ and butt-weld ends, and PTFE seats.
Part of the Trunnion Mounted Ball Valves family
Last updated: 2026-11
Specifications
| size range | DN100 to DN700 |
|---|---|
| pressure class | Class 150 to Class 2500, PN1.6 to PN10.0 |
| body materials | ASTM A216 WCB, ASTM A351 CF8, ASTM A351 CF8M |
| seat materials | PTFE |
| ball materials | ASTM A182 F304, ASTM A182 F316 |
| stem materials | ASTM A182 F304, ASTM A182 F316 |
| end connections | RF, RTJ, BW |
| operation | Manual, Gear Operated, Electric Actuated |
| temperature range | -30 to 220 C |
| design standards | API 6D, API 608 |
| testing standards | API 6D, API 598 |
| face to face | API 6D |
| flange standards | ANSI B16.5 |
Application & selection guidance
Trunnion mounting is the answer where a floating ball would need an impractical actuator: from roughly DN100 upward and at the higher classes, prefer this execution. Choose the seat for the medium (PTFE on the benchmark page; confirm metal-seated options for hot or abrasive duty at quotation), the end connection for the piping class, and the operation for torque and fail-safe needs. The declared size range starts at DN100 - smaller bores belong to the floating executions.
Frequently asked questions
Trunnion-mounted vs floating ball valve - when does the trunnion matter?
A floating ball seals by line pressure pressing it against the downstream seat, so seat load and actuator torque grow with bore and pressure. A trunnion-mounted ball is fixed at both ends: the seats carry the load and torque stays moderate. As a rule of thumb, large bores (from about DN100 on the benchmark page) and high classes move to trunnion; small-bore low-class lines stay floating.
Why does the benchmark page list both Class and PN ratings?
Class ratings (ASME B16.34) and PN ratings belong to different flange-standard systems, and this execution is offered into both worlds: ANSI Class 150 to 2500 for ASME piping and a PN marking for DIN-style lines. They are not interchangeable labels - pick the rating that matches the mating flanges and confirm the material group rating at the working temperature.
What information is needed to quote a casting trunnion ball valve?
Nominal size (DN100 to DN700 on the benchmark page), pressure class, body material (WCB or stainless CF8/CF8M executions), seat material, end connection (RF, RTJ or butt weld), operation (manual, gear or electric actuated), and the service medium with temperature. Add any fire-safe or anti-static requirement so the execution and documentation are confirmed at quotation.
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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