API Β· ASME Β· DIN Β· EN standard industrial valves
Double Flanged Butterfly Valves
Double flanged butterfly valves bolt to the pipe on both faces with their own integral flanges, so they suit buried, water-works and pump-station lines where a wafer body cannot be trusted to carry the load. The range covers DN50 to DN350 at PN10 to PN16, with WCB, ductile iron or CF8/CF8M/CF3M body and disc, SS420/SS431 stem, NBR seal and RPTFE-plus-graphite bearing, operated by gear or actuator. Design follows BS EN 593 / BS 5155 with EN558 face-to-face and ANSI B16.1 / AWWA C207 / EN 1092-2 flanges, tested to API 598 / EN 12266-2. Selection turns on the low PN band of this execution against the line class, the elastomer seal versus the medium, and flange drilling standard.
Part of the Butterfly Valves family
Last updated: 2026-11
Family specifications
| size range | DN50 to DN350 |
|---|---|
| pressure class | PN10 to PN16 |
| seat materials | NBR |
| disc materials | WCB, Ductile Iron, CF8, CF8M |
| stem materials | SS420, SS431 |
| body materials | WCB, Ductile Iron, CF8, CF8M, CF3M |
| end connections | Flanged |
| operation | Gear Operated, Electric Actuated, Pneumatic Actuated |
| design standards | BS EN 593, BS 5155 |
| design standards | BS EN593, BS5155 |
| testing standards | API 598, EN 12266-2 |
| face to face | EN558, BS5155 |
| lever class150 dfv size range | DN65 to DN1200 |
| lever class150 dfv pressure class | Class 150 |
| lever class150 dfv working pressure | PN16 |
| lever class150 dfv temperature range | -10C to 100C |
| lever class150 dfv operation | Lever Operated |
| lever class150 dfv design standards | EN 593, BS 5155 |
| lever class150 dfv flange standard | ASME B16.42 Class 150 |
| lever class150 dfv test standard | EN 12266 |
| lever class150 dfv test pressure | Seat 17.6 bar, Shell 24 bar |
| lever class150 dfv body materials | Ductile Iron |
| lever class150 dfv disc materials | Ductile Iron, Stainless Steel, Aluminium Bronze |
| lever class150 dfv stem materials | Stainless Steel |
| lever class150 dfv seat materials | EPDM, PTFE (sealing washer) |
| is13095 dfv size range | DN65 to DN1200 |
| is13095 dfv body materials | Cast Iron, Spheroidal Graphite Iron, WCB, CF8, CF8M |
| is13095 dfv disc materials | Cast Iron, Spheroidal Graphite Iron, WCB, CF8, CF8M |
| is13095 dfv shaft materials | AISI 410, AISI 304, AISI 316 |
| is13095 dfv seat materials | Nitrile (NBR), EPDM, Neoprene (CR), Silicone, FKM (fluoroelastomer) |
| is13095 dfv bush bearing materials | Self-lubricating sintered bronze |
| is13095 dfv design standards | IS 13095, BS 5155, BS EN 593, AWWA C504 |
| is13095 dfv pressure class | PN10, PN16, Class 125, Class 150 |
| is13095 dfv temperature range | -20C to +180C |
| is13095 dfv face to face | ISO 5752, BS 5155, API 609 |
| is13095 dfv operation size split | Hand lever DN40 to DN150, Gear operated DN200 to DN1200 |
| is13095 dfv end connections | Double Flanged, Wafer (flangeless) |
| is13095 dfv mounting flange standards | IS, ANSI, BS, DIN |
| is13095 dfv testing standards | BS 6755 Part 1, API 598, AWWA C504 |
| eccentric dfv size range | DN100 to DN2600 |
| eccentric dfv pressure class | PN10, PN16 |
| eccentric dfv face to face | EN 558-1 Series 13, EN 558-1 Series 14 |
| eccentric dfv flange connection | EN 1092 PN10/16, ANSI B16.1 |
| eccentric dfv top flange | ISO 5211 |
| eccentric dfv design variant | Double flanged eccentric (double offset), resilient rubber seat, ductile iron body |
| eccentric dfv seat repairability | Seat repairable in field; in certain cases repairable from outside the valve without line disassembly |
| eccentric dfv coating | All iron parts fusion bonded epoxy coated |
| resilient dfv design standards | EN 593, BS 5155 |
| resilient dfv size range | DN100 to DN800 (4" to 32") |
| resilient dfv pressure class | PN6, PN10, PN16 |
| resilient dfv temperature limit | Up to 100C (drinking and service water) |
| resilient dfv face to face | EN 558-1 basic series 13 (DIN 3202 series F16), BS 5155 |
| resilient dfv flange connection | ANSI CL150, PN6, PN10, PN16 |
| resilient dfv top flange | ISO 5211 |
| resilient dfv body materials | Ductile cast iron GGG40/50 |
| resilient dfv disc materials | Ductile cast iron GGG40/50 (epoxy coated) |
| resilient dfv seat materials | EPDM (replaceable rubber sleeve with integrated seal) |
| resilient dfv shaft materials | Stainless steel grade 1.4021 |
| resilient dfv test standard | EN 12266-1 leak rate A |
| resilient dfv marking | EN 19 |
| resilient dfv coating | Body internally and externally epoxy coated, thickness >250 um; disc epoxy coated |
| resilient dfv shaft features | Anti-blowout shaft, Maintenance-free shaft bearings |
| resilient dfv bidirectional closure | Tight in both flow directions |
| resilient dfv certification | EN 10204 3.1 material certificate |
| bolt materials | SS304 |
| screw materials | SS304 |
| retainer materials | SS201 |
| bearing | RPTFE+Graphite |
| flanged end dimension | ANSI B16.1, AWWA C207, EN1092-2 |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry β 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 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, 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 double flanged butterfly valves?
The published specification for this family lists BS EN 593, BS 5155 as the design standards. Testing follows API 598, EN 12266-2.
What sizes and pressure ratings are available for double flanged butterfly valves?
The published size range is DN50 to DN350, and the published pressure ratings are PN10 to PN16. Availability of a specific size and rating is confirmed at quotation.
What materials are double flanged butterfly valves available in?
The published specification lists body materials: WCB, Ductile Iron, CF8, CF8M, CF3M. Material availability for a specific size and rating is confirmed at quotation.
What end connections do double flanged 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 double flanged butterfly valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination β anything missing is confirmed during quotation.
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