API · ASME · DIN · EN standard industrial valves
Lug Butterfly Valves
Lug butterfly valves carry threaded lugs around the body so the disc can isolate one side of the line while the other stays flanged off — the dead-end service and easy-section-removal version of the butterfly family. The range covers a stainless series at DN40 to DN300, PN10 to PN40 / Class 150, with SS316L, carbon steel, cast iron or ductile iron body, PTFE bushing, EPDM/NBR/PTFE seat, SS410-through-nickel-copper alloy stem and aluminium-bronze-to-SS316 disc, operated by lever, gear or actuator. Design follows API 609 with API 609 / MSS SP-67 / SP-68 face-to-face and API 598 testing. Selection turns on the lug execution against dead-end pressure, seat material versus medium and the actuation option at the line size.
Part of the Butterfly Valves family
Last updated: 2026-11
Family specifications
| size range | DN40 to DN300 |
|---|---|
| pressure class | PN10 to PN40, Class 150 |
| seat materials | EPDM, NBR, PTFE |
| disc materials | Aluminium Bronze, Carbon Steel, Cast Iron, Ductile Iron, SS304, SS316 |
| stem materials | SS410, SS420, SS416, SS304, SS316, nickel-copper alloy |
| body materials | SS316L, Carbon Steel, Cast Iron, Ductile Iron |
| end connections | Lug |
| operation | Lever Operated, Gear Operated, Electric Actuated, Pneumatic Actuated |
| design standards | API 609 |
| testing standards | API 598 |
| bvl size range | DN 40 - DN200 |
| bvl nominal pressure | PN10, PN16 / ASME 150# acc. to B16.5 |
| bvl design | DIN EN 593 |
| bvl certifications | CE-Marking, TA Luft, ATEX, WRAS |
| bvl marking | EN 19 |
| bvl face to face | DIN EN 558 line 20 / API 609 table 1 |
| bvl mounting flange | DIN EN ISO 5211 |
| bvl test | DIN EN 12266-1 leakage rate A bidirectional / API 598 / ISO 5208 category 3 |
| bvl body materials | EN-GJS-400-15 (EN 1563), one-piece lug body |
| bvl disc materials | CF8M, two-piece disc and stem connection |
| bvl seat temperature nbr | -25 deg C to +100 deg C (NBR) |
| bvl seat temperature epdm | -35 deg C to +130 deg C (EPDM) |
| bvl seat temperature fkm | -20 deg C to +200 deg C (FKM) |
| bvl tightness | Bubble-tight up to 16 bar (DN50-DN300), up to 10 bar (DN350-DN1200) |
| bvl stem features | Anti blow out stem, self-adjusting stem seal, non-corrosive bushing |
| tml1140 design | Resilient-seated, centric lug-type butterfly valve with threaded holes to DIN-EN 593 |
| tml1140 service temperature | Drinking and service water up to 100 deg C |
| tml1140 size range | DN40 - DN800 (1,5" - 32") |
| tml1140 operating pressure | PN6, PN10, PN16 |
| tml1140 end of line use | As end-of-valve for full differential pressure |
| tml1140 face to face | DIN EN 558-1, basic series 20 (DIN 3202, series K1) |
| tml1140 top flange | Actuator flange connection acc. to ISO 5211 |
| tml1140 test standard | EN 12266-1, leak-rate A, tight in both flow directions |
| tml1140 body materials | Cast iron GG25 |
| tml1140 disc materials | Ductile cast iron GGG50 |
| tml1140 sleeve | EPDM (replaceable rubber sleeve with integrated seal) |
| tml1140 shaft materials | Stainless steel 1.4021, anti-blowout |
| tml1140 certification | EN 10204 3.1 |
| tml1140 coating | Body internally and externally epoxy coated, coating thickness over 250 um |
| tml1150 design | Resilient-seated, centric lug-type butterfly valve with through holes to DIN-EN 593 |
| tml1150 size range | DN50 - DN600 (2" - 24") |
| tml1150 operating pressure | PN6, PN10, PN16 |
| tml1150 flange standard | Lug-type for flanges according to EN 1092-2 |
| tml1150 seat design | Resilient seat according to EN 593 |
| tml1150 body materials | Cast iron GG25 |
| tml1150 disc materials | Ductile cast iron GGG40/50 |
| tml1150 sleeve | EPDM (replaceable rubber sleeve with integrated seal) |
| tml1150 shaft materials | Stainless steel 1.4021, anti-blowout, maintenance-free shaft bearings |
| tml1150 end of line use | Can be used as end-of-valve for full differential pressure |
| tml1340 design variant | Lug type PTFE seated butterfly valve for services where standard elastomers are not suitable (chemical, pharmaceutical, food) |
| tml1340 size range | DN50 - DN300 (2" - 12") |
| tml1340 operating pressure | PN8 |
| tml1340 flange connection | PN10, PN16 |
| tml1340 top flange | ISO 5211 |
| tml1340 marking | EN 19 |
| tml1340 face to face | EN 558-1/20 |
| tml1340 body design | Two piece body design with elastomer backing |
| tml1340 disc options | Stainless steel disc standard (type 1340), 3mm PTFE coated disc optional (type 1341) |
| vtf design variants | Wafer, flanged and fully lugged designs, concentric and eccentric structures |
| vtf shut off | Bubble-tight shut off for all items |
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 lug butterfly valves?
The published specification for this family lists API 609 as the design standards. Testing follows API 598.
What sizes and pressure ratings are available for lug butterfly valves?
The published size range is DN40 to DN300, and the published pressure ratings are PN10 to PN40, Class 150. Availability of a specific size and rating is confirmed at quotation.
What materials are lug butterfly valves available in?
The published specification lists body materials: SS316L, Carbon Steel, Cast Iron, Ductile Iron. Material availability for a specific size and rating is confirmed at quotation.
What end connections do lug butterfly valves support?
The published specification lists Lug as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for lug 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.
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