Size Range: DN15–DN300
Pressure Range: PN6–PN16
End Connection: Flanged, Threaded, or Socket Weld
Material: Ductile Iron or Carbon Steel Body with PTFE/FEP Lining
Seals: Fluorine-Lined EPDM or PTFE Diaphragm
Valves Design: Straight-through or Weir-Type Body Design
Face to Face: ISO 5752 / DIN EN 558
End Connection: ASME B16.5, EN 1092-1
Testing & Inspection: API 598, ISO 5208
Suitable Medium: Acidic, Alkaline, Corrosive, and High-Purity Fluids
The PTFE-lined pneumatic diaphragm valve is a corrosion-resistant flow control solution designed for handling aggressive and high-purity media. It combines the mechanical durability of metal with the superior chemical resistance of fluoroplastics. The inner lining—typically made from PTFE (Polytetrafluoroethylene), FEP, or PFA—effectively isolates the fluid from the valve body, ensuring long-term performance in corrosive or ultra-clean environments. The pneumatic actuator provides automated control, while the diaphragm design ensures tight sealing without contamination.
| No. | Part Name | Gray Cast Iron | Carbon Steel | Stainless Steel | Low Carbon Stainless Steel |
|---|---|---|---|---|---|
| 1 | Body, cover, disc | A126C JIS3 | A126 WCB | A315 CF8 / CF8M | A315 CF3 / CF3M |
| 2 | Stem | — | A182 F6 | A182 F304 / F316 | A182 F304L / F316L |
| 3 | Lining Layer | FEP (F46), PFA, PTFE (F3), PO | |||
| 4 | Diaphragm | FEP (F46), CR (Neoprene), PFA, PTFE, EPDM | |||
| 5 | Bolt | A193 B7 | A193 B7 | A193 B8M | A193 B8M |
| 6 | Nut | A194 2H | A194 2H | A194 8 | A194 8 |
PN1.0MPa
| DN (mm) | NPS (inch) | L | D | D1 | D2 | f | b | Z–ød | D0 | H | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 3/4 | 121 | 105 | 75 | 58 | 2 | 14 | 4–ø13.5 | 70 | 92 | 6.3 |
| 25 | 1 | 131 | 115 | 85 | 68 | 2 | 16 | 4–ø14 | 83 | 96 | 7.4 |
| 32 | 1 1/4 | 150 | 140 | 100 | 78 | 2 | 18 | 4–ø18 | 104 | 106 | 9.4 |
| 40 | 1 1/2 | 163 | 150 | 110 | 85 | 3 | 18 | 4–ø18 | 112 | 107 | 10.5 |
| 50 | 2 | 190 | 165 | 125 | 102 | 3 | 20 | 4–ø18 | 124 | 112 | 12.5 |
| 65 | 2 1/2 | 220 | 185 | 145 | 122 | 3 | 20 | 4–ø18 | 145 | 128 | 17.5 |
| 80 | 3 | 258 | 200 | 160 | 135 | 3 | 22 | 8–ø18 | 173 | 165 | 26 |
| 100 | 4 | 320 | 220 | 180 | 155 | 3 | 24 | 8–ø18 | 230 | 216 | 40 |
| 125 | 5 | 362 | 250 | 210 | 184 | 3 | 26 | 8–ø18 | 310 | 256 | 61 |
| 150 | 6 | 400 | 285 | 240 | 210 | 3 | 28 | 8–ø23 | 360 | 298 | 85 |
| 200 | 8 | 529 | 340 | 295 | 268 | 3 | 28 | 8–ø23 | 462 | 142 | 124 |
| DN (mm) | NPS (inch) | L | D | D1 | D2 | f | b | Z–ød | D0 | H | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 3/4 | 121 | 105 | 75 | 58 | 2 | 14 | 4–ø13.5 | 70 | 92 | 6.3 |
| 25 | 1 | 131 | 115 | 85 | 68 | 2 | 16 | 4–ø14 | 83 | 96 | 7.8 |
| 32 | 1 1/4 | 150 | 140 | 100 | 78 | 2 | 18 | 4–ø18 | 104 | 106 | 10.5 |
| 40 | 1 1/2 | 150 | 140 | 110 | 85 | 3 | 18 | 4–ø18 | 112 | 107 | 11 |
| 50 | 2 | 190 | 165 | 125 | 102 | 3 | 20 | 4–ø18 | 140 | 167 | 11 |
PTFE-lined pneumatic diaphragm valves are widely used across industries where chemical compatibility, purity, and automation are critical:
Chemical Processing: For handling acids, alkalis, and reactive media
Pharmaceuticals & Biotech: Sterile fluid handling and clean-in-place systems
Water Treatment: Dosing and flow control of corrosive disinfectants
Pulp & Paper: Chlorine-based bleaching systems
Food & Beverage: CIP systems and hygienic fluid transfer
Mining & Metallurgy: Acid leaching and slurry control
Their corrosion resistance, zero-leakage design, and low-maintenance construction make them a reliable choice for demanding fluid systems requiring both safety and precision.
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