Ball Valves · Two-Piece Ball Valves
Two Piece Forged Steel Ball Valves
Two piece forged steel ball valves are the forged-body, threaded-class execution of the floating-ball principle: the pressure boundary is machined from forged A105-family bar rather than cast, and the two-body split keeps the seat and ball serviceable from one end. The benchmark execution covers 1/4" to 3" at Class 800 to Class 2500, with A105/F304/F316/F304L/F316L body options, PTFE/RPTFE seats, and ASME B16.34 design with API 598 testing.
Part of the Two-Piece Ball Valves family
Last updated: 2026-11
Specifications
| size range | 1/4" to 3" |
|---|---|
| pressure class | Class800 to Class2500 |
| body materials | A105, F304, F316, F304L, F316L |
| body materials | A105, F304, F316 |
| seat materials | PTFE, RPTFE |
| ball materials | F304, F316, F304L, F316L |
| stem materials | SS316, SS304 |
| temperature range | -20℃~150℃ |
| design standards | ASME B16.34 |
| testing standards | API598 |
| face to face | DIN3202 |
Application & selection guidance
Select this execution for small-bore, high-pressure lines - injection, sampling, chemical and instrumentation service - where the bore is too small for cast construction to be economic and the class is too high for a standard cast ball valve. Pick the body forging (A105 for general service, F304/F304L/F316/F316L for corrosive media) against the medium, and confirm the -20 to 150 C working window and DIN 3202 face-to-face against the piping layout.
Frequently asked questions
Why forged steel for a two piece ball valve?
At 1/4" to 3" and Class 800 to Class 2500, a forged A105-family body gives a denser, defect-free pressure boundary; cast bodies at this size carry proportionally thicker walls and harder qualification. The benchmark page lists body, bonnet and nut across A105, F304, F316, F304L and F316L, so the same forging route covers the boundary end to end.
Which seat and stem materials does this execution use?
The benchmark page lists PTFE and RPTFE seats with a PTFE gasket, packing and thrust washer, SS304 packing gland, and SS316 or SS304 stems. RPTFE is the hotter, stiffer seat option inside the -20 to 150 C window; match it against the medium and cycle count.
What information is needed to quote a two piece forged steel ball valve?
Nominal size within 1/4" to 3", pressure class from Class 800 to Class 2500, body and trim forging (A105, F304, F316, F304L or F316L against the medium), seat material (PTFE or RPTFE), and the applicable standards - ASME B16.34 design, DIN 3202 face-to-face, API 598 test. Those points fix the quote in one pass.
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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