A, the purpose of the wafer check valves check valve installed in the pipeline system, its main function is to prevent the backflow medium, the check valve is a kind of rely on medium pressure automatic opening and closing of the valve. The wafer check valve is suitable for the nominal pressure PN1. 0MPa~42. 0 mpa, Class150 ~ 25000, nominal diameter DN15 ~ 1200 mm, NPS1/2 ~ 48, working temperature Various lines of 196 ~ 540 ℃, is used to prevent the backflow medium. By choosing different capable person, can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and uric acid, and other media. Second, the wafer check valves are the main material is carbon steel, low temperature steel, dual phase steel ( F51/F55） , titanium alloy, aluminum bronze, for secco nickel ( 铬镍铁合金) , SS304, SS304L, SS316, SS316L, chrome molybdenum steel, monel, 400/500) , 20 # alloy, hartz alloy of metal materials. Three, wafer check valves standard and specification, design and manufacturing: 1 API594, API6D, JB/T89372, structure length: API594, API6D, DIN3202, JB/T89373, pressure, temperature rating: ANSI B16. 34, DIN2401, GB/T9124, HG20604, HG20625, SH3406, JB/T744, test and inspection: API598, JB/T90925, piping flange: JB/T74-90, GB/T9112 - 9124、HG20592~20635、SH3406、ANSI B 16. 5,DIN2543 - 2548、GB / T13402 API605 ASMEB16。 47 four, the structure characteristics of the Industrial Valves, check valve 1, the structure of short length, the length of the structure is only 1/4 ~ 1/82 of traditional flange check valves, small volume, light weight, the weight is only 1/4 ~ 1/203 of traditional flange check valves, nimble, sealed performance is good, long service life, reliable performance, smooth flow, fluid resistance small, 6, 5 horizontal line or vertical line can be used, easy installation, 7, disc stroke is short, close impact small 8, 9 simple and compact structure, beautiful modelling, the disc close fast, small water hammer pressure
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