DN40 LCB Body PTFE Seat Wafer Butterfly Valve
What Is LCB?
LCB= Low Carbon Steel for Low Temperature Service, is a low-temperature carbon steel, typically used in environments down to -46°C or lower. It offers good toughness and impact resistance in cold conditions.
LCB VS WCB VS Ductile Iron.
| Property | LCB | WCB | Ductile Iron |
|---|---|---|---|
| Temperature Range | -46°C to 345°C | -29°C to 425°C | -10°C to 120°C |
| Strength | High | Very High | Medium |
| Toughness | Excellent (low temp) | Good | Moderate |
| Cost | High | Medium | Low |
| Pressure Rating | High | Very High | Low-Medium |
| Typical Use | Low temp service | General industry | Water systems |
DN32 PTFE Seat Wafer Butterfly Valve Parts
| Parts | Ductile Iron type | WCB type | Stainless Steel Type | Duplex Stainless Steel Type |
|---|---|---|---|---|
| Body | Cast Iron(GG25) Ductile Iron(GGG40/50) |
A216 A217 A105(forged) |
SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M |
2205 2507 1.4529 |
| Disc | Ductile Iron with Ni coated Ductile Iron with nylon coated Ductile Iron with PTFE/EPDM lined Stainless Steel Duplex Stainless Steel Bronze |
SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M 2205 2507 1.4529 |
2205 2507 1.4529 |
|
| Seat | NBR, EPDM, PTFE, Viton, Hypalon, Silicon, PFA | |||
| Stem | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel | Duplex Stainless Steel, Monel | ||
| Actuator | Hand Lever, Worm Gear, Electric, Pneumatic | |||
PTFE Wafer Butterfly Valve Standards
| ITEM | Standard |
| Design | EN593 | API609 |
| Face to Face | EN558 | ISO5752 | API608 | BS5155-4 |
| Top Flange | ISO5211 |
| Flange Drilling | PN6 | PN10 | PN16 | ASME B16.5 CL150 | JIS 10K |
| Pressure Rating | PN6 | PN10 | PN16 | PN25 | CL150 | JIS 10K |
| Tightness Test | ISO5208 | API598 | EN12266-1 |
Paraments of DN32 Wafer Butterfly Valve
| SIZE | D1 | D2 | D3 | N×φD | α° | F | G | A | B | C | E |
| DN50(2″) | 52.6 | 100 | 120.6 | 4×19 | 45 | 52 | 266.7 | 273 | 161 | 43 | 32 |
| DN100(4″) | 104 | 156 | 190.5 | 8×19 | 22.5 | 52 | 266.7 | 346 | 200 | 52.1 | 32 |
| DN150(6″) | 155.6 | 212 | 241.3 | 8×22. | 422.5 | 52 | 266.7 | 397 | 226 | 55.8 | 32 |
| DN200(8″) | 202.4 | 264 | 298.4 | 8×22. | 422.5 | 52 | 359 | 485 | 260 | 60.6 | 45 |
CF8 Disc PTFE Seat Wafer Butterfly Valve Applications
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Chemical Processing: Corrosive liquids, acids, alkalis, organic solvents.
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Water and Wastewater Treatment: Sludge treatment requiring low leakage and chemical resistance.
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Food, Beverage, and Pharmaceutical Industries: Suitable for applications with high hygiene and pollution control requirements.
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Industrial Piping Systems: Compressed air and inert gas lines (ensure the use of seat materials suitable for the gases).
-
Laboratory and Research Facilities: Small-diameter piping requiring reliable isolation from various chemical media.
Limitations/Precautions
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Not suitable for high-temperature steam or highly abrasive slurries—PTFE soft seats may deform or wear.
-
Operating temperature limits are lower than for metal seats.
-
Generally suitable for low-pressure applications—not suitable for medium- or high-pressure piping.
Butterfly Valve Manufacture Process
ZFA Butterfly Valve Certificates
WRAS
CE
ISO 9001
EAC Russia
