A fluorine-lined lift check valve is a non-return valve that prevents backflow in pipelines carrying corrosive fluids. The valve’s internal surfaces are lined with fluorine-based materials, providing resistance to chemical corrosion, making it suitable for industries such as chemical processing and water treatment.
The valve allows flow in one direction, closing automatically if the flow reverses. A lifting disc inside the valve rises with forward flow and lowers to block reverse flow. This design protects pipelines and equipment in systems transporting corrosive media.
| Name/Material | WCB | CF8 | CF3 | CF8M | CF3M |
| Body | WCB | CF8 | CF3 | CF8M | CF3M |
| Stem | WCB | CF8 | CF3 | CF8M | CF3M |
| Disc | WCB | CF8 | CF3 | CF8M | CF3M |
| Lined | FEP / PFA / PO / PTFE | ||||
| Seat | PTFE / RPTFE | ||||
| Bolt/Nut | B7/2H | B8/8 | B8/8 | B8M/8M | B8M/8M |
| Design&Manufacture Standard | GB/T12235/GB/T12236 | API 6D | ||
| FTF Dimension Standard | HG/T3704, GB/T12221 | ASME B16.10 | ||
| Flange standard | HG/T20592, GB/T9119 | ASME B16.5, JIS B2220 | ||
| Inspection & Test Standard | HG/T13927, JB/T9092 | API 598 | ||
| Normal Diameter | DN15~DN350 | 1/2”~14” | ||
| Normal Pressure | 1.0MPa | 1.6MPa | 150LB | |
| Test pressure | Shell Test | 1.5MPa | 1.5MPa | 1.5MPa |
| High Pressure Test | 1.1MPa | 1.1MPa | 1.1MPa | |
| Low Pressure Test | 0.6MPa | 0.6MPa | 0.6MPa | |
| Temperature Range | FEP:-29℃~120℃, PFA:-29℃~180℃, PTFE:-29℃~150℃ | |||
| Applicable Medium | Strong corrosion medium: Hydrochloric acid, Nitric acid, Hydrofluoric acid, Liquid chlorine, Sulfuric acid and Aqua regia etc. | |||
| DN (mm | PNS (Inch) | L | L1 | L2 | D | D1 | D2 | f | b | Z-Φd |
| 25 | 1 | 160 | 160 | 100 | 115 | 85 | 65 | 3 | 17 | 4-14 |
| 32 | 1-1/4 | 180 | 180 | 110 | 140 | 100 | 75 | 3 | 19 | 4-18 |
| 40 | 1-1/2 | 200 | 200 | 125 | 150 | 110 | 85 | 3 | 19 | 4-18 |
| 50 | 2 | 230 | 230 | 140 | 165 | 125 | 100 | 3 | 21 | 4-18 |
| 65 | 2-1/2 | 290 | 290 | 160 | 185 | 145 | 120 | 3 | 21 | 4-18 |
| 80 | 3 | 310 | 310 | 185 | 200 | 160 | 135 | 3 | 21 | 8-18 |
| 100 | 4 | 350 | 350 | 210 | 220 | 180 | 155 | 3 | 23 | 8-18 |
| 125 | 5 | 400 | 400 | 250 | 250 | 210 | 185 | 4 | 24 | 8-18 |
| 150 | 6 | 480 | 480 | 300 | 285 | 240 | 210 | 4 | 26 | 8-23 |
| 200 | 8 | 600 | 495 | 380 | 340 | 295 | 265 | 4 | 26 | 8/12-23 |
| 250 | 10 | 620 | 600 | 420 | 395 | 350 | 320 | 4 | 28 | 12-23/26 |
The fluorine-lined check valve is also known as check valve.The role of this type of valve is to only allow the medium to flow in one direction, and to prevent the flow in that direction.Usually this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self-weight of the disc act on the valve seat, thereby cutting off the flow.
They are designed to allow fluid to flow in one direction, stopping reverse flow automatically.
Lift-type check valves have a sturdy structure that can handle high-pressure and high-temperature environments.
These valves provide tight sealing, ensuring there is no leakage when the flow reverses.
With a simple design, they require less maintenance and are generally reliable over long periods.
Lift-type check valves can be used in both orientations, providing flexibility in system design.
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