Butterfly valve_product features and performance
Time: May 19, 2020 01:08:07 Source: Yonglong Valve Reading: zero second
butterfly valve _ Product features and performance
The butterfly valve is small in size and light in weight, and can be used as a device for cutting off and regulating flow in various medium pipelines. The valve plate and seal seat made of different materials, as well as the plate and shaft connected without pins can be used for worse working conditions, such as desulfurization, vacuum, seawater desalination system, etc. Butterfly valves are applicable to pipelines of petroleum, chemical, food, medicine, paper making, water and electricity, ships, water supply and drainage, smelting, energy and other systems, and can be used as regulating and intercepting equipment on a variety of corrosive and non corrosive gas, liquid, semi fluid and solid powder pipes and containers.
Features and performance of butterfly valve:
Butterfly valve refers to a kind of valve whose closing part (disc or butterfly plate) is a disc and rotates around the valve shaft to open and close. It is mainly used for cutting off and throttling on the pipeline. The opening and closing part of butterfly valve 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.
The butterfly valve is usually less than 90 ° or ≤ 90 ° from full opening to full closing. The butterfly valve and butterfly stem have no self-locking capacity. In order to position the butterfly plate, a worm gear reducer should be installed on the valve stem. The use of worm gear reducer can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operating performance of the valve.
Special industrial butterfly valve is characterized by high temperature resistance, high applicable pressure range, large nominal diameter of valve, carbon steel valve body, and metal ring instead of rubber ring for sealing ring of valve plate. The large high-temperature butterfly valve is welded with steel plate and is mainly used for the flue and gas ducts of high-temperature media.
Technical parameters of butterfly valve:
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Main performance parameters: |
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Nominal pressure |
PN 1.0/1.6Mpa |
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Applicable temperature |
≤120℃ |
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Applicable media |
Water, air, food, oil |
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seal ring |
EPDM, rubber, F46, PTFE |
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Main parts |
Valve body, disc, valve stem, valve seat, rotating shaft, handle, turbine |
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Main materials |
Cast iron, ductile iron, carbon steel, stainless steel |
The advantages of butterfly valve are as follows:
1. It is convenient and quick to open and close, labor-saving, small fluid resistance, and can be operated frequently.
2. Simple structure, small size and light weight.
3. The mud can be transported, and the liquid accumulated at the pipe mouth is the least.
4. Good sealing can be achieved under low pressure.
5. Good adjustment performance
The disadvantages of butterfly valve are as follows:
1. The operating pressure and temperature range are small.
2. Poor sealing.
Butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure. According to the sealing form, it can be divided into two types: relatively sealed type and hard sealed type. The soft seal type generally adopts rubber ring seal, and the hard seal type usually adopts metal ring seal. According to the connection type, it can be divided into flange connection and wafer connection; According to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.
The installation and maintenance of butterfly valve shall pay attention to the following matters:
1. During installation, the valve disc shall be stopped at the closed position.
2. The opening position shall be determined according to the rotation angle of the butterfly plate.
3. For butterfly valve with bypass valve, the bypass valve shall be opened before opening.
4. The installation shall be carried out according to the manufacturer's installation instructions. The butterfly valve with large weight shall be provided with a solid foundation.
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