May I ask: What are the characteristics of plug valves and their most suitable applications?

Plug valve refers to a valve in which the closing member (plug) rotates around the center line of the valve body to open and close. Plug valves are mainly used in pipelines to cut off, distribute and change the flow direction of media. Plug valve is the earliest valve used by people in history. Due to its simple structure, rapid opening and closing (the plug can be opened and closed by rotating a quarter turn), easy operation, and low fluid resistance, it is still widely used today. Currently it is mainly used under conditions of low pressure, small diameter and low medium temperature. The plug and plug body of the plug valve are a well-matched cone, and its taper is generally 1 : 6 and 1 : 7. 1. Tight-set plug valves Tight-set plug valves are usually used in low-pressure straight-through pipelines. The sealing performance depends entirely on the fit between the plug and the plug body. The sealing surface is tightened by tightening the lower nut. Generally used for PN ≤ 0.6 Mpa. 2. Packing plug valve. The packing type plug valve achieves sealing between the plug and the plug body by compressing the packing. Because of the filler, the sealing performance is better. Usually this kind of plug valve has a packing gland, and the plug does not need to extend out of the valve body, thus reducing a leakage path of the working medium. This kind of plug valve is widely used for pressures of PN ≤ 1Mpa. 3. Self-sealing plug valve The self-sealing plug valve uses the pressure of the medium itself to achieve a tight seal between the plug and the plug body. The small head of the plug extends upward outside the body, and the medium enters the big head of the plug through the small hole at the inlet, pressing the plug upward. This structure is generally used for air media. 4. Oil-sealed plug valve In recent years, the application range of plug valves has been continuously expanded, and oil-sealed plug valves with forced lubrication have appeared. Due to forced lubrication, an oil film is formed between the sealing surface of the plug and the plug body. In this way, the sealing performance is better, opening and closing is labor-saving, and the sealing surface is prevented from being damaged. The main advantages of plug valves are as follows: Suitable for frequent operations, opening and closing quickly and easily. Fluid resistance is small. It has simple structure, relatively small size, light weight and easy maintenance. The good sealing performance is not restricted by the installation direction, and the flow direction of the medium can be arbitrary. No vibration and little noise. 　　 The following matters should be paid attention to when installing and maintaining plug valves:: Leave a position where the valve stem rotates and cannot be used for throttling. Ball valves with transmission mechanisms should be installed upright

Thank you friends on the 2nd floor. Could you please tell me more about the specific industries it is used in or which devices can be used in industrial and mining industries?

Nowadays, plug valves are used more and more widely in the chemical industry. Many are used in instruments. . In addition, many plug valves are used in pipelines for materials that are prone to polymerization (plug valves can reduce pipeline dead ends as much as possible)

Here I would like to ask professionals who are engaged in the natural gas pipeline industry. The pressure level is 10MPa. Can a plug valve be used on the venting pipeline? The pipe diameter is DN50~300. And what type of plug valve is more suitable? Here, thank you in advance!

Give an example: The drain valve at the bottom of the gas compressor is a plug valve.