Globe valves are widely used and have many types. The main types are bellows globe valves, flange globe valves, internal thread globe valves, stainless steel globe valves, DC globe valves, needle globe valves, Y-shaped globe valves, angle globe valves, etc. type globe valve, heat preservation globe valve, cast steel globe valve, forged steel globe valve; how to select the type is very important, it needs to be selected according to the characteristics of the medium, temperature, pressure and working conditions. The specific selection rules are as follows:
1. Pneumatic globe valve should be selected on the pipeline or device of high temperature and high pressure medium. Such as high temperature and high pressure pipelines in thermal power plants and petrochemical systems;
2. The direct-flow globe valve should be used on the pipeline where the convection resistance requirements are not strict;
3. Needle valve, instrument valve, sampling valve, pressure gauge valve, etc. can be used for small pneumatic globe valve;
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. For example, on the pipeline with a nominal diameter of ≤50mm, it is best to use a pneumatic stop valve and an electric control valve;
5. For the easy-to-solidify crystallization medium, choose a heat preservation shut-off valve;
6. For ultra-high pressure environments, forged globe valves should be selected;
7. 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 PN160 nominal pressure 16MPa or PN320 nominal pressure 32MPa;
8. In the desiliconization workshop and the pipelines prone to coking in the alumina Bayer process, it is easy to choose a direct-flow globe valve or a direct-flow throttle valve with a separate valve body, a removable valve seat, and a cemented carbide sealing pair;
9. In the water supply and heating projects in urban construction, the nominal passage is smaller, and the pneumatic shut-off valve, balance valve or plunger valve can be selected, for example, the nominal passage is less than 150mm.
10. It is best to choose imported bellows globe valve for high temperature steam and toxic and harmful media.
11. For acid-base globe valve, choose stainless steel globe valve or fluorine-lined globe valve.
Post time: Apr-29-2022