First, the working principle Plug valve plug: Plug with a hole as the opening and closing pieces of the valve. Plug body with the stem rotation, in order to achieve opening and closing movements. Small non-packing plug valve, also known as "Cork." Stopcock plug bodies are mostly cones (also have a cylinder), and the valve body with the tapered bore surface to form a sealing pair. Plug valve is the first to use a valve, the structure is simple, fast switching, fluid resistance. Normal plug valve by finishing the metal plug body and the direct contact between the body to seal, so poor sealing, opening and closing force, easy to wear, usually only for low (not higher than 1 MPa) and small Caliber (less than 100 mm) of the occasion. In order to expand the scope of application of plug valves, many new structures have been developed. Oil-lubricated plug valve is the most important one (see figure [oil-lubricated plug valve]). Special grease from the top of the plug body into the cone between the body and plug to form a film to reduce the opening and closing torque, improve sealing and service life. Its work pressure up to 64 MPa, the maximum operating temperature up to 325 ℃, the maximum diameter of up to 600 mm. Stopcock channels have many forms. Common straight-through is mainly used to cut off the fluid. Three-way and four-way stopcock Suitable for fluid commutated stopcock valve opening and closing pieces is a perforated cylinder, around the axis perpendicular to the axis of rotation, so as to achieve the purpose of opening and closing channels. Plug valves are mainly used to open and close the pipeline and equipment media purposes. Second, the application Occasions Because the closure of the plug valve is a plunger-shaped rotary valve, through the rotation of 90o valve plug on the channel and the body of the channel coincide or separate, to open and close the valve, so the most suitable plug valve And quick opening and closing of the occasion; In addition, due to the structural characteristics of the plug valve due to it is mainly used for cutting off and connected to the media and the distribution and change of media flow direction of the occasion; but according to the applicable properties and sealing surface erosion resistance, Sometimes can also be applied to the throttling occasion; In addition, the plug valve sealing surface with a wiping action, and in full Kai can completely prevent contact with the flow medium, it can also be used for the medium with suspended particles Another important feature of the plug valve is its ease of adaptation to multichannel structures so that one, two, three, or even four different flow paths can be obtained from a single valve. This simplifies the design of the piping system by replacing several valves, Reduce the amount of valves and some of the connection fittings needed in the equipment. Plug valves are widely used in oil and gas field mining, conveying and refining equipment; also widely used in petrochemical, chemical, natural gas, liquefied petroleum gas, gas, HVAC industry and food industry, pharmaceutical industry system. Non-lubricated plug valves with bushing, used in petrochemical, chemical and other industries, especially in the medium is not allowed to apply lubricant. Plug valves have been widely used in petroleum, chemical, liquefied petroleum gas, food, pharmaceuticals, urban construction, and other departments, as well as people's daily lives. Third, the main advantages 1, for regular operation, opening and closing fast, lightweight. 2, the fluid resistance is small. 3, simple structure, relative size, light weight, easy maintenance. 4, good sealing performance 5, regardless of the installation direction, the flow of media can be arbitrary. 6, no vibration, noise.
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