API · ASME · DIN · EN standard industrial valves
Triple Offset Butterfly Valves
Triple offset butterfly valves add a third, conical geometry to the double-offset disc so the seat touches only at the final degrees of closure — metal-to-metal sealing with no rubbing, which is what high-temperature and tight-shutdown isolation demands. The range covers a flanged execution at DN50 to DN500, PN10 to PN63 / Class 150 to Class 1500, with ASTM A216 WCB body, disc, gland and graphite gasket, SS304-plus-graphite seal ring and ASTM A105 retaining ring and end cap, operated by gear or actuator. Design follows BS 5155 / EN 593 with ASME B16.5 / DIN3202 F4 / EN558-1 face-to-face and API 598 testing. Selection turns on the metal-seal pairing against line temperature, the class against design pressure, and flanged face standard.
Part of the Butterfly Valves family
Last updated: 2026-10
Family specifications
| size range | DN50 to DN500 |
|---|---|
| pressure class | PN10 to PN63, Class 150 to Class 1500 |
| seat materials | SS304 + Graphite seal ring, Graphite gasket |
| disc materials | ASTM A216 WCB |
| body materials | ASTM A216 WCB |
| end connections | Flanged |
| operation | Gear Operated, Electric Actuated, Pneumatic Actuated |
| design standards | BS 5155, EN 593 |
| testing standards | API 598 |
| face to face | ASME B16.5, DIN3202 F4, EN558-1 |
| kxt size range | DN200 to DN2000 |
| kxt operating pressure | PN10, PN16, PN24 |
| kxt end standards | DIN 3202, DIN 2501 (PN10/PN16) |
| kxt body materials | Stainless steel |
| kxt seal materials | 304 stainless steel + flexible graphite |
| kxt shaft materials | Stainless steel |
| kxt suitable medium | Water, steam, oils, nitrose, acetic acid, etc. |
| kxt temp ss | -40 deg C to 650 deg C (stainless steel body) |
| kxt temp wcb | -29 deg C to 425 deg C (WCB) |
| kxw size range | DN100 to DN2000 |
| kxw operating pressure | PN10, PN16, PN24 |
| kxw body materials | ASTM A216 WCB |
| kxw seal materials | 304 stainless steel + flexible graphite |
| wlt body materials | ASTM A216 WCB |
| wlt nominal size | DN1100 |
| wlt operating pressure | PN10 |
| wlt end connection | Flanged (RF) |
| wlt face to face | API 609 |
| wlt working temperature | -29 deg C to +427 deg C |
| wlt operation | Gear operated |
| wlt test standard | API 598 |
| wlt design standard | API 609 |
| wl2 nominal size | 16 inch |
| wl2 operating pressure | Class 150 LB |
| wl2 seat design | Metal seat |
| kst design standard | API 609 |
| kst body materials | ASTM A216 WCB (cast carbon steel) |
| kst nominal size | 10 inch (DN250, 250 mm) |
| kst operating pressure | Class 600 LB (PN100) |
| kst end connection | Double flanged |
| kst operation | Gear operated |
| kst temperature range | -29 deg C to 425 deg C |
| kst seal design | Three-eccentric metal sealing structure with multi-layer metal seal |
| ng documented body materials | Documented examples include WCB, CF8 and WC6; other materials subject to engineering and manufacturability review |
| ng documented configurations | Documented completed valves include a DN1200 Class 150 CF8 electric configuration, Class 300 product records and large flanged hydraulic-operated valves (not a continuous standard catalogue range) |
| ng design basis | API 609 or another applicable product basis may be specified where confirmed for the quoted configuration |
| ng pressure direction | One-direction or two-direction shutoff requirement |
| ng end arrangement | Wafer, lug, flanged, butt-weld or other confirmed body/end arrangement |
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 triple offset butterfly valves?
The published specification for this family lists BS 5155, EN 593 as the design standards. Testing follows API 598.
What sizes and pressure ratings are available for triple offset butterfly valves?
The published size range is DN50 to DN500, and the published pressure ratings are PN10 to PN63, Class 150 to Class 1500. Availability of a specific size and rating is confirmed at quotation.
What materials are triple offset butterfly valves available in?
The published specification lists body materials: ASTM A216 WCB. Material availability for a specific size and rating is confirmed at quotation.
What end connections do triple offset butterfly valves support?
The published specification lists Flanged as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for triple offset butterfly 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
Flanged Triple Offset Butterfly Valves
Flanged triple offset butterfly valves are the flanged-end execution of the triple offset geometry: three distinct offsets place the seat axis off the body cent
View specifications →Model
Wafer Triple Offset Butterfly Valves
Wafer triple offset butterfly valves combine the compact wafer clamp of the butterfly family with the third-offset geometry that cams the disc off the seat befo
View specifications →Model
WCB Triple Eccentric Butterfly Valves
WCB triple eccentric butterfly valves execute the triple-offset metal-sealing principle in a WCB cast body with a 304 + flexible graphite seal: the geometry wip
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TC Series Triple Offset Butterfly Valves
The TC Series is the triple-offset butterfly valve execution for severe service: a metal-to-metal laminated seal (graphite/UNS31803) with hard-faced cobalt-chro
View specifications →Model
VF-8 Series Triple Offset Butterfly Valves
The VF-8 series triple offset butterfly valve: wafer, lug or double-flange body in ANSI Class 150/300/600/900, standard dimensions 4″48″ (100mm1200mm) with leng
View specifications →Request a quote for triple offset butterfly valves
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