Features of Flanged CF8 Butterfly Valve
- CF8 body & disc of this stainless steel butterfly valve has excellent corrosion resistance in environments containing corrosive medium.
- Replaceable Seat Double Flanged Butterfly Valve adopts a replaceable seat, so its main advantage is that it can be easily replaced without replacing the entire valve assembly, saving maintenance and replacement costs.
- Efficient Flow Control: This stainless steel butterfly valve plate inside the valve can rotate 90 degrees to fully open or close the valve. This design provides lower flow resistance, allowing for higher flow rates and more efficient fluid control.
- Simple Installation: The Double Flanged Butterfly Valve makes installation of the valve easier and faster, and it can reduce possible problems and delays during installation.
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Butterfly valve flange connection: Unlike wafer-type valves, flanged butterfly valves can be used at the end of a pipeline or for single-flange applications, as the valve body is self-supporting. However, blind flanges must be installed to prevent seal failure.
Basic Info of Flanged Stainless Steel Butterfly Valve
Material Options of Industrial Stainless Steel Butterfly Valve
| 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 | |||
Standards of Replaceable Seat Butterfly Valve
| 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 |
Parameters of Double Flanged Stainless Steel Butterfly Valve
Lever op ss butterfly valve
| DN | D | K | Nxd0 | d | C | L | f | A | B | K1 | 01 | n-d1 | HXH | h | |||||
| PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | ||||||||||
| DN50 | 165 | 125 | 4xφ18 | 99 | 19 | 108 | 3 | 139 | 80 | 65 | 50 | 4-8 | 11X11 | 30 | |||||
| DN65 | 185 | 145 | 4xφ18 | 118 | 19 | 112 | 3 | 146 | 89 | 65 | 50 | 4-8 | 11X11 | 30 | |||||
| DN80 | 200 | 160 | 8xφ18 | 132 | 19 | 114 | 3 | 150 | 95 | 65 | 50 | 4-8 | 11X11 | 30 | |||||
| DN100 | 220 | 180 | 8xφ18 | 156 | 19 | 127 | 3 | 177 | 114 | 90 | 70 | 4-10 | 11X11 | 30 | |||||
| DN125 | 250 | 210 | 8xφ18 | 184 | 19 | 140 | 3 | 178 | 125 | 90 | 70 | 4-10 | 14X14 | 30 | |||||
| DN150 | 285 | 240 | 8xφ22 | 211 | 20 | 140 | 3 | 201 | 139 | 90 | 70 | 4-10 | 14X14 | 30 | |||||
| DN200 | 340 | 295 | 8xφ22 | 12xφ22 | 270 | 20 | 152 | 3 | 230 | 170 | 125 | 102 | 4-12 | 17X17 | 35 | ||||
worm gear op ss butterfly valve
| DN | 0 | K | Nxd0 | d | C | L | f | A | B | 01 | 02 | 0-d1 | d0 | H | |||||
| PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | PN10 | PN16 | ||||||||||
| DN250 | 395 | 405 | 350 | 355 | 12xφ23 | 12xφ28 | 319 | 22 | 165 | 3 | 266 | 198 | 125 | 102 | 4-12 | 22X22 | 35 | ||
| DN300 | 445 | 460 | 400 | 410 | 12xφ23 | 12xφ28 | 370 | 24.5 | 178 | 4 | 298 | 223 | 125 | 102 | 4-12 | 22X22 | 35 | ||
| DN350 | 505 | 520 | 460 | 470 | 16xφ23 | 16xφ28 | 429 | 24.5 | 26.5 | 190 | 4 | 310 | 254 | 150 | 125 | 4-14 | 22X22 | 35 | |
| DN400 | 565 | 580 | 515 | 525 | 16xφ28 | 16xφ31 | 480 | 245 | 28 | 216 | 4 | 340 | 278 | 175 | 140 | 4-18 | 27X27 | 50 | |
| DN500 | 670 | 715 | 620 | 650 | 20xφ28 | 20xφ34 | 582 | 609 | 265 | 32 | 229 | 4 | 430 | 348 | 175 | 140 | 4-18 | 36X36 | 50 |
| DN600 | 780 | 840 | 725 | 770 | 20xφ31 | 20xφ37 | 682 | 720 | 30 | 36 | 267 | 5 | 500 | 410 | 210 | 165 | 4-22 | 36X36 | 60 |
| DN700 | 895 | 910 | 840 | 24xφ31 | 24xφ37 | 794 | 325 | 395 | 292 | 5 | 560 | 480 | 300 | 254 | 8-18 | φ6335 | 80 | ||
| DN800 | 1015 | 1025 | 950 | 24xφ34 | 24xφ40 | 901 | 35 | 41 | 318 | 5 | 620 | 530 | 300 | 254 | 8-18 | φ6335 | 80 | ||
| DN900 | 1115 | 1125 | 1050 | 28xφ34 | 28xφ40 | 1001 | 36 | 44 | 330 | 5 | 685 | 605 | 300 | 254 | 8-18 | φ75 | 100 | ||
| DN1000 | 1230 | 1255 | 1160 | 1170 | 28xφ37 | 28xφ43 | 1112 | 40 | 50 | 410 | 5 | 735 | 670 | 300 | 254 | 8-18 | φ80 | 100 | |
| DN1200 | 1455 | 1485 | 1380 | 1390 | 32xφ40 | 32xφ49 | 1328 | 45 | 57 | 470 | 5 | 917 | 780 | 350 | 298 | 8-22 | φ90 | 100 | |
Manufacture Process of Flanged Stainless Steel Butterfly Valve
Typical Applications of CF8 Buttefly Valve
- Municipal water supply and water treatment
- Wastewater and sewage systems
- Chemical and process industries
- Marine and desalination plants
- Food & beverage processing
- Pharmaceutical manufacturing
- HVAC and district cooling systems
- Power plants and industrial utility pipelines
Certificates of Zfa Valve - Chinese Leading Buttefly Valve Supplier
WRAS
CE
ISO 9001
EAC Russia
FAQ of CF8 Replaceable Dovetail Seat Buttefly Valve
1. Why Choose Stainless Steel Butterfly Valve Instead of Ductile Iron?
Stainless steel butterfly valves offer superior corrosion resistance, making them ideal for aggressive media and humid environments. Unlike coated ductile iron valves, stainless steel has no coating that can peel or chip over time, ensuring better hygiene for food, beverage, and pharmaceutical applications. They also provide a longer service life, lower maintenance costs, and a cleaner appearance throughout their operating life.
2. What Is a Replaceable Seat Butterfly Valve? Why Choose a Replaceable Dovetail Seat Butterfly Valve?
A replaceable seat butterfly valve uses a removable elastomer seat that can be replaced after wear without replacing the entire valve, while the stainless steel body and disc remain in service. This design extends valve life while reducing maintenance costs and downtime.
3. Can This Double Flanged Butterfly Valve Be Used for Dead-End Service?
Yes. The double flanged body design provides secure bolting on both sides, allowing the valve to be used for dead-end (end-of-line) service when installed according to the manufacturer’s recommendations such as usage of blind flange.
4. Can the Seat Be Replaced Without Removing the Valve?
In most cases, the seat replacement requires removing the valve from the pipeline. However, compared with bonded-seat designs, replacing only the seat is much faster and more cost-effective than replacing the complete valve.
5. Which Seat Material Should I Choose?
*EPDM: Water, drinking water, cooling water, HVAC, mild chemicals.
*NBR: Oil, petroleum products, compressed air.
*FKM (Viton): High-temperature oils and many chemicals.
*PTFE: Strong acids, alkalis, and highly corrosive chemicals.
The best choice of seat material depends on your operating temperature and media.
6. EPDM vs NBR: Which Is Better?
EPDM offers excellent resistance to water, steam, and weathering, making it ideal for water treatment systems. NBR provides better resistance to oils, fuels, and hydrocarbons, making it suitable for petroleum and compressed air applications.
7. When Should I Choose CF8 (SS304)?What Media Is CF8 Suitable For?
CF8 butterfly valves are commonly used for:
Potable water
Cooling water
Wastewater
Compressed air
Food and beverage fluids
Mild acids and alkalis
General industrial process fluids
8. Is CF8 Suitable for Chloride like Seawater?
CF8 has limited resistance to chloride-containing media. CF8 can be used for occasional or low-chloride seawater exposure, but it is generally not recommended for continuous seawater service because chlorides may cause pitting corrosion.
9. What’s the Difference Between CF8 and CF8M? Which Should I Choose?
| Media | Recommend |
|---|---|
| Water | CF8 |
| Potable Water | CF8 |
| Mild Acid | CF8 |
| Chloride | CF8M |
| Seawater | CF8M |
| Chemical | CF8M |
CF8 is the cast equivalent of SS304, while CF8M corresponds to SS316.
*Choose CF8 for general water, HVAC, food processing, and mild chemical applications. CF8 is more economical for general industrial applications.
*CF8M contains molybdenum, providing significantly better resistance to chlorides, seawater, and aggressive chemicals. Choose CF8M for seawater, coastal installations, chloride-containing media, pharmaceutical plants, and highly corrosive chemical processes.
10. What Is the Maximum Pressure Rating?
The maximum pressure depends on valve size and seat material. Standard resilient seated stainless steel double flanged butterfly valves are typically available in PN10, PN16, and PN25, with pressure classes up to ANSI Class 150.
11. What Is the Temperature Range?
The temperature range depends on the seat material:
EPDM: -10°C to 110°C
NBR: -10°C to 80°C
FKM (Viton): -15°C to 180°C
PTFE: -10°C to 180°C
Please consult us for special operating conditions.
12. Which Actuator Is Recommended?
This industrial stainless steel butterfly valve can be supplied with actuators selection guide:
Lever handle (DN＜300mm)
Worm gear
Pneumatic actuator
Electric actuator
Hydraulic actuator
Electric and pneumatic are more suitable for automation requirements.
15. How Do I Maintain a Stainless Steel Butterfly Valve?
Routine maintenance includes checking the seat for wear, inspecting seals and fasteners, operating the valve periodically, and replacing the seat when necessary. Because the body is made from stainless steel, maintenance requirements are significantly lower than coated cast iron valves.
