Sanitary butterfly valve is a valve that uses a disc-type opening and closing member to reciprocate around 90° to open, close, or regulate the flow of media. Sanitary butterfly valves are not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy in operation and fast, but also can have good flow adjustment function and close sealing characteristics at the same time. One of the fastest valve varieties. Butterfly valves are widely used. The variety and quantity of its use are still continuing to expand, and to high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment characteristics, and multi-function development of a valve. Its reliability and other performance indicators have reached a high level. Let's get to know different kinds of sanitary butterfly valves.
Classify sanitary butterfly valves according to the sealing material and form
Classify sanitary butterfly valves according to the connection mode
The special sanitary butterfly valve—electric sanitary butterfly valve
Classify sanitary butterfly valves according to the sealing material and form
According to the sealing material:
1.Soft sealing butterfly valve: the sealing pair is composed of nonmetal soft material and nonmetal soft material.
2. Metal hard seal butterfly valve: the sealing pair is composed of hard metal material and hard metal material.
According to the sealing form:
1. Elastic seal sanitary butterfly valve: the sealing specific pressure is generated by the elasticity of the valve plate squeezing the seat, seat or valve plate when the valve is closed.
2. External torque sealing sanitary butterfly valve: the sealing specific pressure is generated by the torque applied to the valve shaft.
3. Sanitary butterfly valve with pressurized sealing: the sealing specific pressure is generated by the filling of the spring sealing element on the valve seat or valve plate.
4. Automatic sealing sanitary butterfly valve: the sealing specific pressure is automatically generated by the medium pressure.
Classify sanitary butterfly valves according to the connection mode
1.Clamp type sanitary butterfly valve: the butterfly plate of the clip type butterfly valve is installed in the diameter direction of the pipeline. The valve is fully open. The clip type sanitary butterfly valve has the advantages of simple structure, small volume and light weight. Butterfly valve has elastic seal and metal seal. Elastic sealing valve, sealing ring can be inlaid on the valve body or attached to the periphery of butterfly plate.
2. Flange type sanitary butterfly valve: the flange type butterfly valve is vertical plate structure, the valve stem is an integral metal hard seal, the sealing ring of the valve is a composite structure of flexible graphite plate and stainless steel plate, which is installed on the valve body, and the sealing surface of butterfly plate is overlaid with stainless steel. The sealing ring of soft sealing valve is made of nitrile rubber and is installed on the butterfly plate.
3. Welded sanitary butterfly valve: Welded butterfly valve is a non airtight butterfly valve, which is widely used in pipes with medium temperature ≤ 300 ℃ and nominal pressure of 0.1MPa in the production process of building materials, metallurgy, mining, electric power, etc., to connect, open and close or adjust medium quality.
The special sanitary butterfly valve—electric sanitary butterfly valve
Electric sanitary butterfly valve belongs to a variety of electric valve and electric control valve. The main connection methods are flange type and clamp type, which are important executive units in the field of industrial automation control. There are two main points for the installation of electric control butterfly valve: the installation position, height, inlet and outlet direction must meet the design requirements. According to the structure, the electric regulating butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type; according to the sealing form, it can be divided into soft sealing type and hard sealing type; the soft sealing type generally adopts rubber ring seal, and the hard sealing type usually adopts metal ring seal.
This article will definitely give you a better understanding of the types of sanitary butterfly valves.
