There are many types of butterfly valves, including quick cut-off and continuous adjustment. Mainly used for liquid and gas low-pressure large-diameter pipelines. It is suitable for occasions where the pressure loss requirements are not high, flow adjustment is required, and the opening and closing requirements are fast; usually the temperature is below 300 ℃ and the pressure is below 40 kg (butterfly valves generally use low pressure, like domestic ones. Very few can achieve CL600), the medium is generally used for water and gas, and the medium is not demanding, and granular medium can also be used.
As a sealed butterfly valve, it brought rapid development after the emergence of synthetic rubber, so it is a new type of shut-off valve. In my country until the 1980s, butterfly valves were mainly used for low-pressure valves, and the valve seat was made of synthetic rubber. By the 1990s, due to increased exchanges with foreign countries, hard-seal (metal-seal) butterfly valves developed rapidly. At present, there are many valve factories that can produce medium-pressure metal-sealed butterfly valves stably, which makes the application field of butterfly valves wider.
The media that the butterfly valve can transport and control include water, condensed water, circulating water, sewage, sea water, air, gas, liquid natural gas, dry powder, mud, fruit slurry and mixtures with suspended solids.
Butterfly valves are suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, it is about three times that of the valve. Therefore, when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered. The pressure loss of the butterfly plate should also be considered when the butterfly plate is closed. Sturdiness. In addition, it is necessary to consider the limitation of the working temperature that the elastic valve seat material can withstand at high temperatures. The structural length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making large-diameter valves. When the butterfly valve is required to control flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.
1. Generally, in throttling, regulating control and mud medium, the structure is required to be short in length and fast in opening and closing speed (1/4 revolution). Low pressure cut-off (small pressure difference), butterfly valve is recommended.
2. The butterfly valve can be used when two-position adjustment, narrowing channel, low noise, cavitation and gasification phenomenon, a small amount of leakage into the atmosphere, and abrasive media are available.
3. When the butterfly valve is used under special conditions such as throttling adjustment, or strict sealing requirements, or severe abrasion, low temperature (cryogenic) and other operating conditions, it is necessary to use a specially designed metal seal with a triple eccentric or double eccentric adjustment device Dedicated butterfly valve for ground.
4. The centerline butterfly valve is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, and oil that require complete sealing, zero gas test leakage, high service life, and working temperature of -10℃~150℃. And various acid and alkali and other pipelines.
5. The soft-sealed eccentric butterfly valve is suitable for the two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways in metallurgy, light industry, electric power, and petrochemical systems.
6. The metal-to-metal wire sealing double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.
7. In addition to being used as a large-scale pressure swing adsorption (PSA) gas separation device program control valve, Jinyong’s metal surface sealed triple eccentric butterfly valve can also be widely used in petroleum, petrochemical, chemical, metallurgical, electric power and other fields. It is a gate valve and a globe valve. A good alternative product.