Diaphragm valves use a flexible membrane (diaphragm) to isolate the flow stream from the valve mechanism, making them ideal for corrosive chemicals, abrasive slurries, and sterile/hygienic applications where contamination or corrosion of internal parts must be prevented.
AQ Process Systems sources and exports weir-type (for throttling and isolation) and straight-through (for full-bore flow in slurry and viscous service) diaphragm valves. Body materials include cast iron, ductile iron, carbon steel, stainless steel, GRP/FRP, and rubber/PTFE-lined construction.
Diaphragm materials include natural rubber, EPDM, NBR, butyl, PTFE, and other elastomers, selected to match the process fluid chemistry and temperature. All diaphragms are replaceable in-line without removing the valve body from the pipeline.
| Product | Specification | Description |
|---|---|---|
| Weir Type | ||
| Weir Type Diaphragm Valves | 1/2", 14" | PN10-25 | Flanged or threaded | Standard weir-type diaphragm valves, the raised weir provides excellent throttling control and positive shutoff. |
| Lined Diaphragm Valves | 1/2", 14" | Rubber, PTFE, PFA, or glass lining | Fully lined body diaphragm valves for aggressive chemical service, the lining protects the body from corrosion. |
| Straight-Through | ||
| Straight-Through Diaphragm Valves | 1", 14" | Full bore | No weir obstruction | Full-bore straight-through design for thick slurries, fibrous media, and viscous fluids where the weir would restrict flow. |
| Specialty | ||
| Sanitary / Hygienic Diaphragm Valves | 1/2", 4" | SS 316L | Tri-clamp connections | Hygienic diaphragm valves for pharmaceutical, food, and biotech applications, polished bore, CIP/SIP capable. |
| Zero Dead-Leg Diaphragm Valves | 1/2", 4" | Biotech grade | Tank bottom mount | Tank-bottom and zero dead-leg diaphragm valves eliminating stagnant pockets, for aseptic process applications. |
Weir-type valves have a raised weir (ridge) in the flow path that the diaphragm seals against, providing excellent throttling control and positive shutoff, but restricting the bore. Straight-through valves have a smooth, unobstructed bore, better for thick slurries, viscous fluids, and fibrous media, but with less precise throttling control.
Natural rubber (water, air), EPDM (acids, alkalis, hot water), NBR (oils, hydrocarbons), Butyl (acids, gases), PTFE (universal chemical resistance, higher temperature), and FKM (acids, solvents). We recommend the correct diaphragm material based on your process fluid, temperature, and concentration.
Diaphragm life depends on the process fluid, temperature, cycling frequency, and diaphragm material. In typical service, rubber diaphragms last 1-3 years and PTFE diaphragms 3-5 years. Replacement is done in-line, the bonnet is removed and the diaphragm swapped without removing the valve body from the pipe.
Yes. We supply hygienic/sanitary diaphragm valves in SS 316L with electropolished bores, tri-clamp connections, and FDA-compliant diaphragm materials. Valves are designed for clean-in-place (CIP) and sterilise-in-place (SIP) operations. Available from 1/2" to 4".
Yes. Diaphragm valves are excellent for abrasive slurries because the diaphragm isolates the closure mechanism from the process fluid, there are no internal seats, packing, or cavities to trap solids or wear. The lined body and replaceable diaphragm absorb the abrasive wear. Straight-through designs are preferred for heavy slurries.
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