API · ASME · DIN · EN standard industrial valves
Weir-Type Diaphragm Valves
Weir-type diaphragm valves seal the flexible diaphragm against a raised weir built into the body, so the short stroke and supported diaphragm suit throttling and corrosive, erosive or solids-laden media that would clog other valve types. The range covers DN15 to DN300 at PN10/PN16, with ductile iron GGG50 bodies, a ductile iron + PTFE seal set and 304 stainless steel stems, EN 593 / DIN 3202 F4 design with DIN 2501 PN6/10/16 flanges, for water, wastewater, air and oil from -20°C to 250°C. Selection turns on the lining/seal material against the medium chemistry and the temperature band against the elastomer limits.
Part of the Diaphragm Valves family
Last updated: 2026-11
Family specifications
| seat design | weir type, PTFE lined body |
|---|---|
| size range | DN15-DN300 |
| pressure class | PN10/ PN16 |
| design standards | EN593, DIN 2501 PN6/10/16, DIN3202 F4 |
| body materials | Ductile Iron / GGG50 |
| seal materials | Ductile Iron+PTFE |
| stem materials | Stainless Steel 304 |
| suitable medium | Water, Waste Water, Air, Oil |
| temperature range | -20 - 250℃ |
| additional design standards | BS 5156, MSS SP-88 |
| standard pressure rating | PN10 |
| di representation | BS 5156 diaphragm valve, ductile iron GGG40, DN50, PN10 |
| pfa lined body | Ductile iron GGG40 body with PFA lining delivers superior chemical resistance against aggressive acids and solvents |
| composite diaphragm execution | Class 150 LB rated execution incorporates a composite EPDM+PTFE diaphragm |
| extended pressure range | PN6~PN16, CLASS150 |
| flange standards | BS 5156, BS 6755, ASME B16.5, BS 4505, EN 1092 |
| body material options | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
| structure types | Weir Type, straight-way type |
| extended size range | DN15-400mm |
| unlined body materials | Grey Iron, Ductile Iron, Cast Steel, Stainless Steel, FeCr, nickel-copper alloy |
| rubber lining options | Hard Rubber (Ebonite), Soft Rubber, Butyl Rubber, Polychloroprene (CR), CSM rubber, EPDM, Soft natural rubber |
| fluoropolymer lining options | PFA, ETFE, ECTFE, PVDF |
| end connection options | Threaded BSPP – NPT, Flanged DIN, BS, ANSI |
| operation | Manual handwheel, Pneumatic actuators, Electric actuators |
| rubber diaphragm materials | Natural Rubber, EPDM, Butyl Rubber, Nitrile Rubber, Polychloroprene (CR), CSM rubber |
| ptfe backed diaphragm materials | PTFE/EPDM, PTFE/Butyl Rubber, PTFE/FPM (fluoroelastomer) |
| inch size range | DN50~DN300 (2"~12") |
| bore size range | DN 10 – DN 300 (3/8" – 12") |
| size | DN15-DN300 |
| standard | EN593, DIN 2501 PN6/10/16, DIN3202 F4 |
| seal | Ductile Iron+PTFE |
| medium | Water, Waste Water, Air, Oil |
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 weir-type diaphragm valves?
The published specification for this family lists EN593, DIN 2501 PN6/10/16, DIN3202 F4 as the design standards.
What sizes and pressure ratings are available for weir-type diaphragm valves?
The published size range is DN15-DN300, and the published pressure ratings are PN10/ PN16. Availability of a specific size and rating is confirmed at quotation.
What materials are weir-type diaphragm valves available in?
The published specification lists body materials: Ductile Iron / GGG50. Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do weir-type diaphragm valves cover?
The published working temperature range is -20 - 250℃. For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What should a quotation inquiry for weir-type diaphragm 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
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