Explore the use of various check valves in backflow prevention

Import check valve, (VCT, Check valve), alias: import check valve, inlet bottom valve, inlet check valve, simple description is to prevent the medium backflow valve. Although simple, different check valves have different uses.

1. Check valve for high pressure applications. High-pressure steam pipe used in power plants, the pressure can reach 32Mpa, or 2500LB. The connection method is generally welded. It is called imported welding type imported check valve. Generally, the forged valve body is used. The self-sealing structure is called imported forged steel. Check valve.

2, the use of American standard design and American standard flange structure, suitable for the use of US oil standard API or ANSI standard check valve, the use of imported American standard check valve, the main grades are 150Lb, 300Lb, 600Lb, 1500Lb.

3, small pipe diameter, low pressure, corrosive medium pipe, generally use internal threaded check valve, stainless steel 304, 316 material, that is, imported internal thread check valve.

4. The check valve in the vertical pipeline can be imported vertical check valve.

5. Hydraulic system, or small-diameter high-pressure pipeline, adopts imported through-way check valve.

6. At the bottom end of the suction pipe of the pump, a check valve with a filtering function is required to automatically prevent the fluid from flowing backwards, and to prevent impurities from entering the pump pipe. At this time, an imported stainless steel bottom valve is used.