Shut-off valve related knowledge
Shut-off valve is the closure of the valve (valve) moves along the valve seat center line. Depending on the type of movement of the valve disc, the change in valve seat opening is in direct proportion to the valve disc stroke. Due to the valve stem of this type of valve opening or closing stroke is relatively short, but also has a very reliable cut-off function, but also because the valve seat opening changes in proportion with the valve stroke is proportional to the flow rate is very suitable for regulation. Therefore, this type of valve is ideally suited for shut-off or regulation as well as throttling. The selection principle is: 1, high temperature, high pressure medium pipe or device should choose the globe valve. Such as thermal power plants, nuclear power plants, petrochemical systems of high temperature and high pressure on the pipeline. 2, on the pipeline convection resistance requirements of the pipeline. That is, the pressure loss is not taken into account. 3, small valve optional needle valve, instrument valve, sampling valve, pressure gauge valve. 4, there is flow regulation or pressure regulation, but the regulation accuracy is not high, and the pipeline diameter is relatively small, such as the nominal pass through the pipeline ≤ 50mm, should be used. 5, synthetic industrial production of small fertilizers and large-scale fertilizer should use nominal pressure PN160 nominal pressure 16MPa or PN320 nominal pressure 32MPa high-pressure angle type stop valve or high-pressure angle throttle. 6, Alumina Bayer process in the production of desiliconization workshop, easy coking pipe, easy to choose the valve body separate, seat can be place, the sealing of the cemented carbide DC globe valve or DC throttle. 7, urban construction in the water supply and heating engineering, the nominal pass through the smaller pipe, the choice of cut-off, balance valve or plunger valve, such as the nominal pass through the pipe less than 150mm. The most obvious advantage is that during the opening and closing process, the valve plate is wearable because of the lower friction between the sealing surfaces of the valve body and the gate valve. The opening height is only 1/4 of the diameter of the valve seat passage, so it is much smaller than the valve. Usually there is only one sealing surface on the valve body and the valve disc, so manufacturing technology is relatively good and easy to maintain. Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K Nominal diameter or diameter: DN10 ~ 500, NPS 1/2 ~ 36 Connection: flange, butt welding, thread, etc. Applicable Temperature: -196 ℃ ~ 700 ℃ Drive: pneumatic, electric, hydraulic, gas-liquid linkage, the valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M 316L), Ti. Selection of different materials, can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media. More keyword search: Globe valve
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