The opening and closing member of the plug valve is a perforated cylinder that rotates about an axis perpendicular to the passage to achieve the purpose of opening and closing the passage. The plug valve is mainly used to open and close the pipeline and the equipment medium, and the plug body rotates with the valve stem to realize the opening and closing action. Small, non-filled plug valves are also known as "Cock". The plug body of the plug valve is mostly a cone (also has a cylinder), and cooperates with the conical hole surface of the valve body to form a seal pair. The plug valve is a valve that uses zui early, and has a simple structure, a quick switch, and a small fluid resistance. The ordinary plug valve is sealed by the direct contact between the finished metal plug body and the valve body, so the sealing performance is poor, the opening and closing force is large, and it is easy to wear, and can usually only be used for low (not higher than 1 MPa) and small. Caliber (less than 100 mm). In order to expand the range of application of the plug valve, many new structures have been developed. The oil lubricated plug valve is an important one for Zui. Special grease is injected from the top of the plug body between the cone hole of the valve body and the plug body to form an oil film to reduce the opening and closing torque and improve the sealing performance and service life. It has a working pressure of 6.4MPA and a high operating temperature of 325°C.
The passage of the plug valve can take many forms. A common straight-through type is primarily used to shut off fluids. Three-way and four-way plug valves are suitable for fluid commutation. The opening and closing member of the plug valve is a perforated cylinder that rotates about an axis perpendicular to the passage to achieve the purpose of opening and closing the passage. Plug valves are primarily used to open and close pipes and equipment media. The plug valve can be divided into four types according to the structure: a compact plug valve, a self-sealing plug valve, a stuffing plug valve and a oil-filled plug valve. According to the channel form, it can be divided into three types: straight-through, three-way and four-way.
Main advantages of the plug valve
1. It is suitable for frequent operation, opening and closing quickly and lightly. 2. The fluid resistance is small. 3, the structure is simple, relatively small volume, light weight, easy to repair. 4. Good sealing performance. 5. It is not restricted by the installation direction, and the flow direction of the medium can be arbitrary. 6, no vibration, low noise.
Plug valve installation and maintenance precautions
1. Leave the position where the valve stem rotates. 2, can not be used for throttling. 3. The plug valve with transmission mechanism should be installed upright.
Application of Plug Valves <br> Plug valves have been widely used in petroleum, chemical, liquefied petroleum gas, food, pharmaceutical, urban construction, and other departments, as well as people's daily lives.
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