The difference between butterfly valve and gate valve
First，it is the difference in appearance, which is the most obvious difference. As shown in Figure-1, the structure of butterfly valve and gate valve is very simple. Butterfly valve is mainly composed of valve body, butterfly disc, valve seat, valve shaft and actuator; gate valve It is mainly composed of valve body, valve bonnet, valve seat, gate wedge, valve stem and actuator.
Second,it is the difference in connection forms. The common connection forms of butterfly valves are wafer type, flange type and Grooved type; the common connection forms of gate valves are flange type, threaded type, welding type and grooved type.
There are also differences in structure. According to different structures, butterfly valves can be divided into central line butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves, triple eccentric butterfly valves, etc.; gate valves are divided into rising stem gate valves and non-rising stem gate valves according to different structures.
Finally, there is a difference in use. The butterfly valve can adjust the flow rate and can also be used to cut off the circulation of the medium. The applicable medium includes water, gas, oil, acid and corrosive fluids, etc. The places where it is used are water supply and drainage pipes, ventilation pipes, sewage. The gate valve can only be fully opened and fully closed, so it can only be used to cut off the flow of the medium. Usually, the suitable medium for the gate valve is water and oil, which are most used in water supply and drainage pipelines. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power plants.
