API · ASME · DIN · EN standard industrial valves
Diaphragm Valves product range
Valves sealing through a flexible diaphragm, built around sealing reliability in corrosive, slurry and utility service.
Last updated: 2026-10
Product family
Cast Iron Diaphragm Valves
Cast iron diaphragm valves isolate or throttle utility flows by pressing a flexible diaphragm against a weir, so the wetted metal stays out of the medium — the…
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Ductile Iron Diaphragm Valves
Ductile iron diaphragm valves put a higher-strength body behind the same weir-sealing idea: a flexible diaphragm meets a body weir so the elastomer and lining —…
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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…
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Straight-Through Diaphragm Valves
Straight-through diaphragm valves run the flow path through an unobstructed, nearly straight bore that the flexible diaphragm presses down onto, so viscous…
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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.
Knowledge: selection guides
Frequently asked questions
What standards govern the design and testing of diaphragm valves?
The published specification for this family lists BS 5156, BS 6755, ASME B16.5, BS 4505, EN 1092 as the design standards.
What sizes and pressure ratings are available for diaphragm valves?
The published size range is DN15 to DN300, and the published pressure ratings are PN10/PN16 (DIN), PN6 to PN16, Class 150 (ANSI). Availability of a specific size and rating is confirmed at quotation.
What materials are diaphragm valves available in?
The published specification lists body materials: Cast iron (ASTM A126), Ductile iron (ASTM A536), WCB (ASTM A216), LCB (ASTM A352), CF8, CF8M (ASTM A351), F316/F316L (ASTM A182), F51/2205 duplex (ASTM A182), WC6, WC9 alloy (ASTM A217). Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do diaphragm valves cover?
The published working temperature range is -20 to 250°C (PTFE-lined weir and straight-through). 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 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.