The main function of check valve

      The main role

     一.Wafer type check valve uses:

     Check valve installed in the piping system, its main role is to prevent the media back, check valve is an automatic valve to rely on media pressure opening and closing. Wafer type check valve for nominal pressure PN1.0MPa~42.0MPa, nominal diameter DN15~1200mm, Class150~25000; NPS1/2~48; all kinds of pipeline working temperature of -196~540 ℃, used to prevent the media back. By choosing different materials, applicable to water, steam,oil, nitric acid, acetic acid, strong oxidizing medium and uric acid and other media.

     二.The main material clamping type check valve:

     Carbon steel, low temperature steel, dual phase steel (F51/F55),titanium alloy, aluminum bronze, Inconel Seoul (INCONEL), SS304,SS304L, SS316, SS316L, chrome molybdenum steel, Monel(400/500), 20# alloy, Hastelloy alloy and other metal materials. On the usage and structure characteristics of wafer type check valve

      Three, wafer type check valve standards and specifications:

      1.Design and manufacture of: API594, API6D, JB/T8937, JB/T3595,

      2.The length of the structure: API594, API6D, DIN3202, JB/T8937,ANSI/ASME B16.10

      3.Ppressure, temperature class: ANSI B16.34, DIN2401, GB/T9124,HG20604, HG20625, SH3406, JB/T74

     4.Test and inspection: API598, JB/T9092, GB/T13927

      5.Flange: JB/T74~90, GB/T9112-9124, HG20592~20635, SH3406,ANSI/ASME, B 16.5, DIN2543-2548, GB/T13402, API605,ASMEB16.47

      The structure characteristics of four, wafer check valve:

      1.A short length of the structure, the structure of the length of onlythe traditional flange valve 1/4~1/8

      2.Small volume, light weight, the weight is only the traditional flangevalve 1/4~1/20

       3.The valve is closed quickly, the water hammer pressure small

       4.Horizontal pipe or a vertical pipe can be used, convenient installation

       5.Flow passage, the fluid resistance is small

      6.Sensitive action, good sealing performance

      7.The valve stroke is short, close the small impact force

     8.The overall structure is simple and compact, modelling beautiful

      9.Long service life, reliable performance

       Check valve in the pump water supply system's role is to prevent the backflow of high-pressure water pump impeller impact. System in the running for some reason, the pump suddenly stops running,the pump pressure disappeared, high pressure water will reverseconnected with the pump outlet flow return pump. Export pump withcheck valve, it will immediately shut down, to prevent reverse flow back into the high-pressure water pump.

      Check valve in the hot water system is to prevent the return of hot water into the pipeline. If the PVC is likely to burn the pipeline, may even hurt, especially in solar water heater system.

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