Butterfly plate in the valve body of the valve rotates about a fixed axis, called the butterfly.

1. As sealed butterfly valve, since the advent of synthetic rubber is only brought with it a rapid development, so it is a new kind of shut-off valve. In our country until the 1980s, butterfly major role in the low-pressure valves, valve seat with synthetic rubber, to the 1990s, the increase in foreign exchange, hard seal Butterfly develop rapidly. At present there are many valve plant can stably produce medium voltage metal sealing butterfly valve, butterfly valve should be shipped the broader field.

2. And control valve can transport media is water, the condensate, circulating water, sewage, water, air, gas, liquid natural gas,Dried powders, slurries, pulp and mixtures with suspended solids.

Current domestic valve parameters are as follows:

Nominal pressure: PN0.25 - 4.0MPa

Nominal diameter system: DN100 - 3000mm

Working temperature: ≤ 425 ℃

3. Butterfly valve  Species: According Connection: flange type, wafer type. According sealing surface material; soft seal and hard seal. According structure, butterfly can be divided into the following types:- Plate Butterfly - Swash Plate - Offset Plate - Leveraged

4. Butterfly valve  features:

 (1) simple structure, small size. As a compact, short length of the structure, small size, light weight, suitable for large diameter valves. 

(2) fluid resistance is small, when fully open, the valve seat passageway effective flow area is larger, and thus the fluid resistance is small. 

(3) open and close easily and quickly, good regulating performance, the disc 90 ° rotation can complete the headstock. By changing the angle of rotation of the disc can be hierarchical control traffic. 

(4) closing torque is small, since both sides of the disc axis by substantially the same role of the media, and the torque generated in the opposite direction, thereby opening and closing more effort. 

(5) low pressure sealing performance, sealing surface material commonly used rubber, plastics, so good sealing performance. By the ring material constraints, butterfly pressure and temperature using a smaller range. However, the use of hard sealing butterfly valve pressure and temperature range, have been greatly improved.

 Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve