API · ASME · DIN · EN standard industrial valves
Trunnion Mounted Ball Valves
Trunnion-mounted ball valves carry the ball on fixed upper and lower trunnions, so line pressure cannot push the seat and operating torque stays controlled as size and class grow. That is the construction used under large bores and high classes: the casting series spans DN100 to DN700 at Class 150 to 2500 (PN1.6 to PN10.0 in the metric range) with -30°C to 220°C temperature rating. Body, ball and stem are specified by ASTM grade (WCB, CF8, CF8M, F304, F316) with PTFE seats, RF/RTJ/butt-weld ends, API 6D face-to-face and manual, gear or electric operation. For high-pressure or large-diameter isolation where a floating ball would need excessive torque, this is the family buyers shortlist.
Part of the Ball Valves family
Last updated: 2026-10
Family 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°C to 220°C |
| design standards | API 6D, API 608 |
| testing standards | API 6D, API 598 |
| face to face | API 6D |
| ctA bore type | FB (full bore), RB (reduced bore) |
| ctA body styles | 2 pieces body, 3 pieces body |
| ctA stem design | Blow-out proof stem |
| ctA antistatic design | Anti-static and stopper device |
| ctA fire safe design | API 607 |
| ctA materials | A105+ENP, A182 F304, A182 F316, A182 F304L, A182 F316L, LF2 |
| ctA size range | 2″ to 36″ |
| ctA pressure class | Class 150 to Class 2500 |
| ctA operation | Lever, Worm gear, Pneumatic, Motor, Electric |
| ctA seat insert materials | Class filled + PTFE |
| ctA seat spring materials | AISI 304 |
| ctA seat seal materials | NBR, Viton |
| ctA trunnion materials | A276 410, A276 304, A276 316, A276 304L, A276 316L |
| ctA bearing materials | 304+PTFE, 316+PTFE |
| ctA gasket materials | 304+Graphite |
| ctA bolt materials | A193 B7, A193 B8 |
| ctA nut materials | A194 2H, A194 8 |
| ctA stem materials | A276 304, A276 316, A276 304L, A276 316L |
| ctA ball materials | F304+ENP, A182 F304, A182 F316, A182 F304L, A182 F316L |
| ntA design standards | API 6D |
| ntA bore type | Full bore, Reduced bore |
| ntA pressure class | Class 150 to 2500 |
| ntA end connections | Flanged, Butt-weld |
| ntA body styles | 2-piece, 3-piece |
| ntA body materials | A105, A182 F316 |
| ntA ball materials | A105 + ENP, A182 F316 |
| ntA stem materials | A182 F6A, A182 F316 |
| ntA seat materials | RPTFE, PEEK |
| wtA design standards | API 6D |
| wtA body materials | ASTM A105N |
| wtA body construction | 2 PC side entry, 3 PC side entry, Welded body, Top entry |
| wtA material options | Carbon steel, Stainless steel, Duplex stainless steel, Alloy and other special materials |
| wtA end connections | RTJ flange |
| wtA face to face | ASME B16.10 |
| wtA testing standards | API 598 |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What standards govern the design and testing of trunnion mounted ball valves?
The published specification for this family lists API 6D, API 608 as the design standards. Testing follows API 6D, API 598.
What sizes and pressure ratings are available for trunnion mounted ball valves?
The published size range is DN100 to DN700, and the published pressure ratings are Class 150 to Class 2500 (PN1.6 to PN10.0). Availability of a specific size and rating is confirmed at quotation.
What materials are trunnion mounted ball valves available in?
The published specification lists body materials: ASTM A216 WCB, ASTM A351 CF8, ASTM A351 CF8M. Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do trunnion mounted ball valves cover?
The published working temperature range is -30°C to 220°C. For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What end connections do trunnion mounted ball valves support?
The published specification lists RF, RTJ, BW as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for trunnion mounted ball valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
Knowledge: selection guides
Models & executions in this subtype
Model
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 s
View specifications →Model
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
View specifications →Model
SS316L Trunnion Ball Valves (API 6D)
The large-diameter anchor of the SS316L ball-valve axis: an API 6D full-bore trunnion-mounted execution at 24 inch (DN600), 900LB (PN150), SS316L ball and stem,
View specifications →Request a quote for trunnion mounted ball valves
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