The plug valve is a rotary valve in the shape of a closure or plunger. After rotating 90 degrees, the channel opening on the valve plug is the same as or separated from the channel opening on the valve body to complete opening or closing. It is widely used in oilfield excavation, transportation and refining equipment, and such valves are also needed in asphalt mixing plants.

The valve plug of the plug valve in the asphalt mixing plant can be cylindrical or conical. In the cylindrical valve plug, the channel is generally rectangular; in the conical valve plug, the channel is trapezoidal. These shapes make the structure of the plug valve light and very suitable for blocking and connecting media and diversion.
Since the movement between the sealing surfaces of the plug valve has a scrubbing effect, and when fully open, it can completely avoid contact with the moving medium, so it can generally be used for media with suspended particles. In addition, another important feature of the plug valve is that it is easy to adapt to the multi-channel structure, so that one valve can obtain two, three, or even four different flow channels, which can simplify the setting of the pipeline system, reduce the amount of valves and some connecting accessories required in the equipment.
The plug valve of the asphalt mixing plants is suitable for frequent operation because of its quick and easy opening and closing. It also has the advantages of small fluid resistance, simple structure, relatively small size, light weight, easy maintenance, good sealing performance, no vibration, and low noise.
When the plug valve is used in the asphalt mixing plants, it will not be constrained by the direction of the device, and the flow direction of the medium can be any, which further promotes its use in the equipment. In fact, in addition to the above-mentioned range, the plug valve can also be widely used in petrochemical, chemical, coal gas, natural gas, liquefied petroleum gas, HVAC occupations and general industry.