Ball Valves Β· Three-Piece Ball Valves
Three Piece Flanged Ball Valves
Three piece flanged ball valves are the flanged-end, investment-cast execution of the three-piece line: CF8, CF8M, cast iron or carbon steel body and cap, SS304/SS316 stem, PTFE sealing set, with full-port or reduced-port bore, blow-out proof stem, anti-static device (option) and locking device. Actuation is not restricted by the construction - the platform is specified separately from the operator.
Part of the Three-Piece Ball Valves family
Last updated: 2026-11
Specifications
| size range | 1/2 to 36 Inch (DN15 to DN900) |
|---|---|
| body materials | CF8, CF8M, Cast Iron, Carbon Steel |
| seat materials | PTFE, RTFE |
| ball materials | CF8, CF8M, Cast Iron, Carbon Steel |
| stem materials | SS304, SS316 |
| end connections | Flanged, Butt-welded |
| design standards | API, ANSI, BS, DIN, JIS, ASME |
| cap materials | CF8, CF8M, Cast Iron, Carbon Steel |
| port option | Full port or Reduced Port |
| construction | Investment casting |
| stem feature | Blow-out proof stem |
| option antistatic | Anti-static device (option) |
| option locking | Locking device |
Application & selection guidance
Select this execution for flanged process lines where the three-piece inline-maintenance split and a flanged end connection per the piping class are both required. Choose full port where pressure drop or pigging matters and reduced port where compactness does; pick CF8/CF8M for corrosive media and cast iron/carbon steel for utility duty, and add the anti-static and locking options where the service demands them.
Frequently asked questions
Full port or reduced port for this execution?
The benchmark page lists both. Full port keeps the bore equal to the pipe bore - lower pressure drop, pigging and cleaning passes; reduced port makes the valve smaller and cheaper for duties where the restriction is acceptable. Choose against the line's pressure-drop budget and whether the line is pigged.
Which safety-relevant construction features are declared?
The benchmark page declares a blow-out proof stem, an anti-static device as an option, and a locking device. The blow-out proof stem retains the stem under pressure even with the gland removed; the anti-static option bonds ball, stem and body to prevent static build-up on flammable media; the locking device secures the handle position.
What materials does the flanged three piece use?
Body, cap and ball in CF8, CF8M, cast iron or carbon steel; stem and gland nut in SS304 or SS316; seat, seal, packing and thrust washer in PTFE with an RTFE seat option; SS304 bolts, nuts and spring washers; stainless steel handle and locking device with a PVC handle sleeve. That covers corrosive and utility duty on one flanged platform.
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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