Before China's various industries widely used for metal valve, valve in recent years, with the progress of science and technology, using high technology toughening ceramic materials do ceramic valve sealing surface gradually replace ordinary metal cut-off valve, widely used in mining, iron and steel industry, purification plant, paper industry, power plant ash, mineral processing, alumina under various working conditions such as the pipeline, cut off or connect pipe medium, use more common, but since the opening and closing torque is larger, the structure length is longer, nominal diameter is usually restricted to below 250 mm, also have to 400 mm, but special attention should be paid to choose.
One, ceramic globe valve selection principles
1, high temperature, high pressure medium pipeline or equipment should choose ceramic globe valve. Such as thermal power plants, nuclear power plants, petrochemical systems of high temperature, high pressure pipeline
2, on the pipeline convection resistance requirements are not strict on the pipeline. That is, the pressure loss of little consideration of the use of the valve
3, small valve can choose needle valve, instrument valve, sampling valve, pressure gauge valve.
4, there is flow regulation or pressure regulation, but the accuracy of the regulation is not high, and the pipe diameter is relatively small, such as nominal through ≤50mm of the pipeline, should choose this kind of valve.
5, in the synthetic industry production of small fertilizer and large fertilizer should choose the nominal pressure PN160 nominal pressure 16MPa or PN320 nominal pressure 32MPa high pressure Angle globe valve or high pressure Angle globe valve.
6, in the production of alumina bayer desilication workshop, easy to coke on the pipeline, easy to choose the valve body separate, the seat can be removed, hard alloy sealing pair of straight flow globe valve or straight flow globe valve.
7. In the water supply and heat supply projects in the urban construction, the nominal pipeline with a small through diameter can be globe valve, balance valve or plunger valve, such as the nominal through diameter is less than 150mm.
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