1. High temperature, high pressure medium pipeline or device should be selected stop valve. Such as thermal power plant, nuclear power plant, petrochemical system of high temperature, high pressure pipeline.
2. Pipeline convection resistance requirements are not strict pipeline. That is where the loss of pressure is not taken into account.
3. Small valves can choose 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 diameter of the pipeline is relatively small, such as the nominal passage of less than or equal to 50mm on the pipeline, should be selected.
5. Small chemical fertilizer and large chemical fertilizer in synthetic industrial production should be selected nominal pressure PN160 nominal pressure 16Mpa or PN320 nominal pressure 32Mpa high pressure Angle type stop valve or high pressure Angle type stop valve.
6. Alumina Bayer process in the production of desilication workshop, easy to coking pipeline, easy to choose the valve body separate type, valve seat available, hard alloy sealing pair of straight flow stop valve or straight flow stop valve.
7. In the city construction of water supply, heating engineering, nominal smaller pipeline, can choose cut-off valve, balance valve or plunger valve, such as nominal less than 150mm on the pipeline.