Introduction about wafer type knife gate valve

Knife gate valve is also one kind of gate valve, which has a knife shaped cut at the end of the valve plate to cut off the medium flow and avoid the closing to be the blocked by the medium. While there are also many types of knife gate valves, according to end connect, there are wafer type knife gate valve, lugged type knife gate valve and flange type knife gate valve. 

With different sealing material used, there are soft sealing knife gate valve and metal to metal seated knife gate valve. 

With different body material used, there are cast iron knife gate valve(including ductile cast iron knife gate valve), carbon steel knife gate valves and stainless steel 304 knife gate valves, stainless steel 316 knife gate valves. 

Main technical parameters of wafer type knife gate valve: 

Nominal Diameter: DN50-DN1200 

Nominal Pressure: 1.0Mpa/1.6Mpa 

Working temperature: rubber sealing ≤80℃,metal hard sealing≤425℃. 

Shell testing pressure: 1.5*PN 

Sealing testing pressure: 1.1*PN 

Body and upper cover material: carbon steel, cast iron, stainless steel 

Valve wedge material: stainless steel 

Valve stem material: stainless steel

Sealing ring material: Natural rubber, PTFE, stainless steel and hard alloy. 

Applicable working temperature for each sealing material: natural rubber T≤80℃，PTFE t≤180℃，metal hard sealing t≤425℃. 

Applicable mediums: syrup, pulp, sewage, coal slurry, ash, slag-water mixture. 

Main advantages of wafer type knife gate valve

1. the wafer type knife gate valve has short face to face structural length, which can save the manufacturing materials, and can greatly reduce the overall weight of the piping system. 

2. The occupying space of wafer knife gate valve is small, which can effectively support the strength of the pipeline, and can reduce the possibility of pipeline vibration. 

3. The valve plate of the wafer type knife gate valve is made of austenitic stainless steel, which greatly improves the corrosion resistance of the wafer type knife gate valve and can effectively prevent the sealing leaking caused by the corrosion of the medium. 

4. The upper sealing packing of the wafer knife gate valve is made of flexible PTFE, which has reliable sealing effect, and is easy and flexible for operation. 

5. The plate of the wafer knife gate valve can work like a sharp knife, which can cut off all kinds of sundries in the mediums. 

Applications of wafer type knife gate valve

Wafer type knife gate valve is widely used in coal preparation, ash discharging, slag discharging in mining power plants, urban sewage treatment, food, sanitation, medicine and other industrial pipeline systems. 

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