What are the Types of Butterfly Valves?

Butterfly valve is a kind of regulating control valve with a simple structure. The butterfly valve can be used for switching control of low pressure pipeline medium, which rotates around the valve shaft to achieve opening and closing. Butterfly valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays a role in cutting off and throttling on the pipeline. The BF valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. What are the types of butterfly valves?

Sanitary butterfly valve

The sanitary butterfly valve adopts standard electronic polishing, and the smooth surface ensures cleanness, no medium accumulation area, and no potential pollution. The quick disassembly and assembly of the valve makes the valve opening and maintenance quick and easy, and shortens the downtime of the process. A sanitary butterfly valve uses a circular butterfly plate as an opening and closing part and rotates with the valve steam to adjust and control water flow. Its rotation angle is between 0° and 90°. These stainless steel butterfly valves can be operated automatically by an electric actuator or pneumatic actuator and manually with a handle, which are widely used in beer, beverages, dairy products, fruit juices, pharmaceuticals, bioengineering and other fields.

Wafer type butterfly valve

Wafer butterfly valve is a very commonly used valve, available in PVC and stainless steel materials. The butterfly plate of the wafer butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° ~ 90°, which can play a role in flow adjustment. When the butterfly plate rotates to 90°, the valve reaches the maximum opening. The wafer butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics.
When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic soft seal and metal seal. Elastic soft sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the butterfly plate.

Lug style type butterfly valve

The driving mode of the lug butterfly valvecan be manual, worm gear, pneumatic, electric, and the connection mode can be flange or wafer. The structure can be single eccentric, center line, double eccentric, and triple eccentric. The materials are cast steel and stainless steel. Because this kind of valve has a very wide range of use, the same kind of valve has different combinations in different occasions and working conditions. The butterfly plate of the lug butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°. When the rotation reaches 90°, the valve is in a fully open state.

Flange type butterfly valve

Flange butterfly valve has the same function as wafer and lug type butterfly valve. It is suitable for drainage, sewage, food, heating, gas, ship, water and electricity, metallurgy with a temperature of 150℃ or less and nominal pressure of 1.6MPa or less. It is also suitable for two way sealing and valve body easy to rust occasions, as a flow adjustment and interception medium.

Double offset butterfly valve

Double offset butterfly valve is also called high performance butterfly valve. It is mainly used for drainage of water plants, power plants, steel smelting, chemical engineering, water source engineering, environmental facility construction, etc. It is especially suitable for water pipelines and used as regulation and interception equipment. Compared with the centerline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, has a longer life and good stability. The structural feature of the double eccentric butterfly valve is that the shaft center of the valve stem deviates from the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to be released from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive squeezing and scratching of the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves the life of the valve seat. Double eccentric butterfly valve can use metal seat, which improves the application of butterfly valve in a high temperature field.

Triple offset butterfly valve

The valve stem axis deviates from the center of the disc and the center of the body at the same time, and the rotation axis of the valve seat has a certain angle with the axis of the valve body channel, which is called a triple offset butterfly valve. The triple eccentric butterfly valve is widely used in metallurgy, electric power, petrochemical, water supply and drainage, and municipal construction and other industrial pipelines with a medium temperature of 425 ℃ or less for adjusting flow and carrying and breaking fluid.

ATO.com provides 1/2 inch, 3/4 inch, 1 inch, 1.5 inch, 2 inch, 2.5 inch, 3 inch, 4 inch, 6 inch sanitary butterfly valves for you to choose from, if you would like more information about ATO sanitary butterfly valves, please feel free to contact us.