Pneumatic Diaphragm Control Valve -- Weir Type Pharma SS316L
Sanitary Modulating Control Valve for Pharmaceutical and Biotech Process
Document No.SV-DS-CTL-001
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers weir-type pneumatic diaphragm control valves in SS316L for pharmaceutical, biotech, and food-grade modulating flow control with tri-clamp connections and CIP/SIP compatibility.
Technical Specifications
| Parameter | Specification |
|---|
| Valve Size Range | DN15 to DN100 (1/2" to 4") |
| Pressure Rating | PN10 (full vacuum to 10 bar) |
| Body Material | Forged SS316L (1.4404), Ra 0.8 µm internal finish |
| Diaphragm Material | PTFE (steam-resistant), EPDM (FDA), silicone (pharma-grade) |
| Weir Profile | Streamlined weir with radiused edges, no dead legs |
| Actuator Type | Multi-spring pneumatic diaphragm (air-to-open / air-to-close) |
| Positioner | Smart 4-20 mA HART positioner with sanitary housing |
| Cv Range | 0.05 to 150 (weir size dependent) |
| Leakage Class | ANSI/FCI 70-2 Class VI (soft diaphragm) |
| Temperature Range | -10°C to +150°C (PTFE diaphragm) |
| End Connections | Tri-Clamp DIN 32676 / SMS / ISO 2852 |
| Surface Finish | Internal Ra 0.8 µm, external Ra 1.6 µm |
Materials of Construction
| Component | Material |
|---|
| Body | Forged SS316L, fully machined from solid bar, no casting porosity, Ra 0.8 µm ID |
| Bonnet | SS316L, bolted or clamped, houses diaphragm compression mechanism |
| Diaphragm | Multi-ply PTFE or EPDM, fabric-reinforced for high-cycle life, replaceable |
| Weir | Integral SS316L weir, polished and radiused, no threads or crevices exposed to product |
| Compressor | SS316 split-ring diaphragm compressor with uniform bolt-circle torque |
| Actuator Diaphragm | Reinforced EPDM or neoprene pneumatic diaphragm with rolling seal |
| Positioner | HART-compatible smart positioner in IP67 stainless steel housing |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | Hydrostatic 1.5x PN, vacuum 0.8 bar |
| Certification | FDA, 3A, EHEDG, CE, ISO 9001 |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | 3A Sanitary Standard / EHEDG / ASME BPE |
Notes
- Diaphragm material must be selected based on CIP chemistry (caustic vs acid) and SIP temperature; PTFE is universal but less elastic than EPDM.
- Weir Cv is non-linear; factory calibration with actual process fluid is recommended for precise dosing applications.
- Tri-clamp ferrule size must match existing line ferrules (DIN 32676, SMS, or ISO 2852); specify at order.
- For absolute zero dead-leg requirement, specify block-and-bleed weir design with integral purge port.
- Diaphragm life is 500,000 to 2,000,000 cycles depending on stroke length and pressure; inspect annually.
