What are the types of pneumatic butterfly valves?
1. There are many types of pneumatic butterfly valves, including quick shut-off and continuous regulation. It is mainly used for low-pressure large diameter pipeline of liquid and gas. As a sealed butterfly valve, it has brought rapid development after the emergence of synthetic rubber, so it is a new type of stop valve. Until the 1980s, butterfly valves were mainly used for low-pressure valves, and their seats were made of synthetic rubber. By the 1990s, due to increased exchanges with foreign countries, hard seal (metal seal) butterfly valves have developed rapidly.
2. At present, there are many valve factories that can produce medium pressure metal seal butterfly valves, which makes butterfly valves more widely used. The media that can be transported and controlled by the butterfly valve include water, condensate, circulating water, sewage, sea water, air, gas, liquid natural gas, dry powder, slurry, pulp and suspended solid mixture. Butterfly valve is suitable for flow regulation.
3. As the pressure loss of butterfly valve in the pipeline is large, about three times that of gate valve, the impact of pressure loss of pipeline system and its strength shall be fully considered when selecting butterfly valve. Gender shall also be taken into account when butterfly plate is under pressure of pipeline medium when closing. In addition, it is necessary to consider the limit of operating temperature of elastic seat material at high temperature.
