In terms of material, stainless steel butterfly valves are available in SS304, SS316, SS304L, SS316L, SS2205, SS2507, SS410, SS431, SS416, SS201, In terms of structure, stainless steel butterfly valves are available in centric and eccentric lines. Centric line stainless steel butterfly valves are generally made of stainless steel for the valve body, valve plate, and shaft, and EPDM or NBR for the valve seat, They are mainly designed for flow control and regulation of corrosive media, especially various strong acids, such as sulphuric acid and aqua regia.
The eccentric soft seal stainless butterfly valve is a double eccentric seal butterfly with a rubber seal. The eccentric hard seal butterfly valve stainless steel butterfly valve is a triple eccentric butterfly valve, usually, the valve body, valve plate, and valve shaft are made of stainless steel, and the sealing surface is a multi-layer sealing ring. It is widely used in metallurgy, electric power, the petrochemical industry, water supply and drainage and municipal construction, and other industrial pipelines where the medium temperature is ≤425℃, for regulating the flow and carrying off the fluid.
Tianjin Zhongfa Valve is a professional butterfly valve manufacturer, with nearly 20 years of development, and has accumulated rich experience in producing CF8M, and CF8 butterfly valves, we have a variety of SS butterfly valves sold overseas, loved by customers. Here, let’s look at the stainless steel butterfly valves of Zhongfa Valve.
1. Stainless steel wafer butterfly valve
2. Stainless steel flange butterfly valve.
3. Stainless steel lug butterfly valve
SS Hard Seal Lug Butterfly Valve
SS hard seal lug butterfly valve: ZHONGFA stainless steel butterfly valve, stainless steel. These kinds of valves are widely used in water, steam, and wastewater treatment.
| SS Lug Butterfly Valve | |
| Size | DN50-DN1600 |
| Pressure Rating | PN10,PN16,CL150,CL300,JIS 5K, JIS 10K |
| Standard | API 609, GOST, BS5155,DIN 3202,ISO 5702 |
| Upper Flange STD | ISO5211 |
| Connection STD | PN6,PN10,PN16,PN25,150LB,300LB,JIS5K,10K,16K,GOST33259 |
| Medium Temperature | -29℃ to 425℃ |
| Valve Materials | SS316,SS304,SS2205,SS2507,904L |
| Sealing Materials | Multi-layer sealing, Stellite Seals |
SS Flange Hard Seal Butterfly Valve
SS flange hard seal butterfly valve adopts a triple eccentric structure, and the sealing surface of the valve seat and disc plate are made of different hardness and stainless steel, which has good corrosion resistance and long service life.
| SS Flange Hard Seal Butterfly Valve | |
| Size | DN50-DN4000 |
| Pressure Rating | PN10,PN16,CL150,CL300,JIS 5K,JIS 10K |
| Standard | API609,GOST,BS5155,DIN3202,ISO 5702 |
| Valve Materials | SS304,SS316,SS2205,SS2507,904L |
| Upper Flange | ISO 5211 |
| Medium Temperature | -29℃ to 425℃ |
| Connection STD | PN10,PN16,CL150,CL300,JIS 5K,JIS 10K,GOST33259 |
SS wafer hard seal Butterfly Valve
This butterfly valve is a triple eccentric multi-level metal sealing structure, no mechanical wear can reach zero leakage, has an excellent two-way sealing function, and can be applied to water, sewage, seawater, air, steam, gas, combustible gas, corrosive media, oil and food and other media, the highest working temperature up to 600 ℃.
| SS Wafer Hard Seal Butterfly Valve | |
| Size | DN50-1200 |
| Pressure Rating | PN10,PN16,PN25,CL150,CL300,JIS 5K, JIS 10K |
| Standard | API609, GOST,BS5155,DIN3202,ISO5702 |
| Upper Flange | ISO5211 |
| Connection STD | PN6,PN10,PN16,PN25,150LB,300LB,JIS5K,10K,GOST33259 |
| Medium Temperature | -29℃ to 425℃ |
| Valve Materials | SS304,SS316,SS2205,SS2507,904L |
| Sealing Materials | Multi-layer sealing， Stellite Seals |
SS Soft Seal Wafer Butterfly Valve
Stainless steel soft-seal wafer butterfly valves are used in applications where the external environment is corrosive.
| SS Lug Butterfly Valve | |
| Size | DN50-DN1600 |
| Pressure Rating | PN10,PN16,CL150,CL300,JIS 5K, JIS 10K |
| Standard | API 609, GOST, BS5155,DIN 3202,ISO 5702 |
| Upper Flange STD | ISO5211 |
| Connection STD | PN6,PN10,PN16,PN25,150LB,300LB,JIS5K,10K,16K,GOST33259 |
| Medium Temperature | -29℃ to 425℃ |
| Valve Materials | SS316,SS304,SS2205,SS2507,904L |
| Sealing Materials | EPDM,NBR |
SS wafer Soft seal Butterfly Valve
Stainless steel soft seal butterfly valve is a midline butterfly valve, generally used in the external conditions of corrosive conditions
| SS Wafer Hard Seal Butterfly Valve | |
| Size | DN50-1200 |
| Pressure Rating | PN10,PN16,PN25,CL150,CL300,JIS 5K, JIS 10K |
| Standard | API609, GOST,BS5155,DIN3202,ISO5702 |
| Upper Flange | ISO5211 |
| Connection STD | PN6,PN10,PN16,PN25,150LB,300LB,JIS5K,10K,GOST33259 |
| Medium Temperature | -29℃ to 425℃ |
| Valve Materials | SS304,SS316,SS2205,SS2507,904L |
| Sealing Materials | NBR,EPDM |
Advantages and disadvantages of stainless steel butterfly valve
1、The advantages of stainless steel butterfly valve
1、Easy to open and close quickly, labor-saving, small fluid resistance, can be often operated.
2、Simple structure, small volume, and lightweight.
3、It can transport slurry and accumulate the least amount of liquid at the mouth of the pipeline.
4、Good sealing can be achieved under low pressure.
5、Good adjustment performance.
Disadvantages of stainless steel butterfly valve
1、Small range of using pressure and working temperature.
2、The sealing is poor.
Analysis of the causes of corrosion of stainless steel butterfly valves
1. Test method
Samples are taken for chemical composition analysis (to determine whether it meets the standard requirements), metallographic organization inspection, heat treatment process test, SEM analysis, and spectrometer analysis.
2. Test results and analysis
2.1 Chemical composition
Chemical composition analysis results and standard composition.
2.2 Metallographic analysis
2.3 SEM analysis