成全电影大全在线观看高清免费播放电视剧_成全的视频高清完整在线观看_成全高清免费完整观看动漫版_成全视频大全高清全集_成全电影大全免费观看完整版有多少集_三人成全免费观看电视剧高清_成全免费观看完整电视电影_成全动漫视频观看免费动漫_成全免费完整高清电影_三人成全免费观看电视剧_成全电影免费观看完整在线播放高清画质_三人成全免费观看中国电视剧大全

Globe Valve summary

Globe valve has good regulating performance, sealing performance is not very good, the structure is simpler than the gate valve, the manufacture and maintenance is more convenient than the gate valve, the fluid resistance is larger, the price is cheaper than the gate valve.

Globe Valve Choose the standard

1 high temperature, high pressure medium pipeline or device should be selected cut-off valve;
Such as thermal power plant, petrochemical system of high temperature, high pressure pipeline selection of cut-off valve is appropriate;
2. The convection resistance requirement on the pipeline is not strict, that is, the pressure loss is not considered;
3. Small valves can choose globe valves, such as needle valve, instrument valve, sampling valve, pressure gauge valve, etc.;
4. There is flow regulation or pressure regulation, but the adjustment accuracy is not high, and the pipeline diameter is relatively small, such as nominal diameter ≤50mm on the pipeline, should choose the cut-off valve or throttle valve;
5 in the urban construction of water supply, heating engineering, nominal diameter small pipeline, can choose cut-off valve, balance valve or plunger valve, such as nominal diameter less than 150mm on the pipeline;
6. Suitable for steam and other media pipelines below DN200;
7. Not suitable for medium with high viscosity;
8. Not suitable for medium containing particles easy to precipitate;
9. It is not suitable for the valve of vent valve and low vacuum system.

BS 1873: Steel globe and stop check valves
GB/T 12235: Flanged and surfacing welded steel globe valves and stop check valves
DIN 3356: Globe valves
Shell SPE 77/103: Steel stop valve according to BS1873