Ball Valves · Three-Piece Ball Valves
Three Piece Forged Steel Ball Valves
Three piece forged steel ball valves are the forged, full-maintenance execution of the three-piece floating-ball line: CF8, CF8M or WCB body and cap forgings with SS316/SS304 ball and stem, PTFE seat and sealing set, designed to ASME B16.34 with DIN 3202 face-to-face and API 598 testing over a -20 to 150 C working window.
Part of the Three-Piece Ball Valves family
Last updated: 2026-11
Specifications
| body materials | CF8, CF8M, WCB |
|---|---|
| seat materials | PTFE |
| ball materials | SS316, SS304 |
| stem materials | SS316, SS304 |
| temperature range | -20℃~150℃ |
| design standards | ASME B16.34 |
| testing standards | API598 |
| face to face | DIN3202 |
| cap materials | CF8, CF8M, WCB |
Application & selection guidance
Select this execution where inline maintenance matters: the three-piece split lets the center section carrying ball and seats be swung out without disturbing the end connections. Pick the body forging (CF8/CF8M stainless for corrosive media, WCB carbon steel for general service) and the trim (SS316 or SS304) against the medium, inside the -20 to 150 C window and the ASME B16.34 class range.
Frequently asked questions
What does the three piece construction add over two piece?
The center body section - ball, seats, stem packing - can be removed for service without breaking the end connections, because the body splits into two caps plus the center section. The benchmark parts list (body, cap, ball, seat, thrust washer, stem, stem packing, gland, spring washer, nut, handle cover) is all reachable through that split; a two piece valve still needs one end disconnected.
Which materials does this forged execution use?
The benchmark page lists CF8, CF8M and WCB for body and cap, SS316 or SS304 for ball and stem, PTFE for seat, thrust washer and stem packing, and SS304 for gland, spring washer and nut. That covers corrosive (CF8/CF8M + SS316) and general (WCB + SS304) duty in one forged platform.
What standards govern the execution?
ASME B16.34 for design, DIN 3202 for face-to-face, and API 598 for test and inspection, over a -20 to 150 C working temperature window per the benchmark page. Match the face-to-face against the mating piping before ordering a replacement into an existing spool.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — 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 — 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 — seat compounds age fastest in direct sunlight and freezing conditions.
Knowledge: selection guides
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