(1) The plug valve fluid passes through the DC, the resistance is small, and the opening and closing is convenient and rapid.
(2) The plug valve is mainly used in the pipeline to cut, upgrade and change the direction of medium flow. It is easy to adapt to multi-channel construction, so that one valve can get two, three or even four different flow channels, which simplifies the design of the piping system, reduces the amount of valve gates and some of the connection fittings required in the equipment.
(3) Plug valves are the earliest valve members used in history. Due to its simple structure, the opening and closing is rapid (the opening and closing action can be completed by rotating the plug 1/4Q circle), the operation is convenient, the fluid resistance is small, and it is still widely used. Mainly used for low pressure, small caliber and medium temperature is not high.
(4) According to the structural characteristics of the plug valve and the functions that can be achieved in the design, it can be selected according to the following principles.
1 It is used to distribute the medium and change the flow direction of the medium. Its working temperature is not higher than 300 °C, the nominal pressure is PN≤1.6MPa, and the nominal diameter is not more than 300mm. It is recommended to use multi-channel plug valve.
2 For equipment and pipelines such as milk, juice, beer and other food enterprises and pharmaceutical factories, it is recommended to use austenitic stainless steel, compact conical plug valve.
3 In oil field mining, natural gas field mining, pipe branching, refining and cleaning equipment, the nominal pressure level is not greater than Class300, and the nominal diameter is not more than 300mm. It is recommended to use oil-sealed conical plug valve.
4 In oil field mining, natural gas exploitation, pipeline transportation, refining and cleaning equipment, the nominal pressure level is not more than Class7500, the nominal diameter is not more than 900mm, and the working temperature is not higher than 340 °C. It is recommended to use oil-sealed conical plug valve.
5 In the large chemical industry, in pipelines and equipment containing corrosive media, it is required to open or close faster. For nitric acid-based media, a Teflon sleeve can be used to seal the conical plug valve. Acetate-based medium, optional Crl8Nil 2M02Ti stainless steel inlaid with Teflon sleeve sealing conical plug valve.
6 In the pipelines and equipment of gas, natural gas and HVAC systems, the nominal diameter is not more than 200nm, and the filler type conical plug valve should be used.
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