The principle is: 1. Globe valve should be selected on the pipeline or device of high temperature and high pressure medium. Such as thermal power plants, nuclear power plants, high temperature and high pressure pipelines of petrochemical systems. 2. On pipelines where the requirements for convection resistance are not strict. That is, where the pressure loss is not considered. 3. Needle valve, instrument valve, sampling valve, pressure gauge valve, etc. can be used for small valves. 4. There is flow adjustment or pressure adjustment, but the requirements for adjustment accuracy are not high, and the diameter of the pipeline is relatively small, such as the pipeline with a nominal diameter of ≤50mm, it should be selected. 5. Small fertilizers and large fertilizers in synthetic industrial production should choose high pressure angle globe valve
or high pressure angle throttle valve with nominal pressure of PN160 and nominal pressure of 16MPa or PN320 of nominal pressure of 32MPa. 6. In the desiliconization workshop and the pipelines prone to coking in the production of alumina Bayer method, it is easy to choose the DC type globe valve or DC type throttle valve with separate valve body, removable valve seat and cemented carbide sealing pair. 7. In the water supply and heating projects in urban construction, the nominal passage is smaller, and the stop, balance valve or plunger valve can be selected, such as the nominal passage less than 150mm.
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