Open-close part by medium flow and strength to open or closed, to avoid medium counter-current valve check valve. Check valve ownership semi-automatic valve class, mainly for the one-way flow of medium pipeline, only allowed to medium flows in one direction, in order to avoid an accident. Butterfly check valve for straight-through non-return Industrial Valves, check valve in a petition ways above can be divided into the turnbuckle petition check valve, flange of the check valve and welding check period 3 kinds. A, wafer check valves: check valve installed in the pipeline system, its main effect is to avoid the media counter-current, the check valve is a kind of depends on the medium pressure semi-automatic valve opening and closing. Check valve can be divided by structure distinguish, up and down type check Industrial Valves, swing check valve and butterfly valve. Wafer check valves are used and the structure of the unique place three standards and norms, wafer check valves: 1, the default and production: API594, API6D, JB/T8937, JB/T3595, length: 2, structure API594, API6D, DIN3202, JB/T8937, ANSI/ASMEB16. 103, pressure, temperature levels: ANSIB16. 34, DIN2401, GB/T9124, HG20604, HG20625, SH3406, JB/T744, try and check experience: API598, JB/T9092, GB/T139275, piping flange: JB/T74-90, GB/T9112 - 9124、HG20592~20635、SH3406、ANSI/ASMEB16. 5,DIN2543 - 2548、GB / T13402 API605 ASMEB16。 47, the structure of the valve, check valve, four unique places: 1, the structure of the Marine valve short length, length of the structure is only 1/4 ~ 1/82 of traditional flange check valves, large and small, light weight, the weight is only 1/4 ~ 1/203 of traditional flange check valves, the disc to close rapidly, small water hammer pressure level 4, pipeline or straight pipe can be used, convenient installation 5, amidst the runner, fluid resistance small, acuity, tightly sealed performance is good, seven, disc stroke is short, close impact small 8, group closely, modelling beautiful 9 simple and compact structure, use fixed number of year of the survival of long and reliable performance check valve in the utility is to avoid high pressure water pump for water system, the impact of the water back to the pump impeller. For some comprised in the operation of the system in, pump suddenly stop running, inside the pump pressure, and export cohesion of high pressure water pump will reverse flow back to pump. Swing check valves can be divided into single type check valve, double disc type check Industrial Valves check valve and valve type 3 kinds. Check the utility of the system is in hot water to avoid hot water back into the pipeline. After choose different material, can be suitable for use in water, steam, oil, acid, CH3COOH nitrate, strong oxygen medium and uric acid, and other media. And the use of different materials, into the check valve can be suitable for use in water, steam, oil, nitric acid, CH3COOH, oxygen medium, ammonium nitrate, and other media. Check valve installation should pay attention to the following things: 1, do not make the check valve in the line for the weight, large check valve shall be independent support, make it not influenced by initiation pressure piping. The check valve is used only for one-way flow of media on the pipeline, block medium backflow, in case of an accident. Second, the wafer check valves are the main material: carbon steel, low temperature steel, dual phase steel ( F51/F55) , chromium alloy, aluminum bronze, for secco nickel ( 铬镍铁合金) , SS304, SS304L, SS316, SS316L, chromium molybdenum alloy, monel, 400/500) , 20 # alloy, hartz alloy of metal materials. Level 4, up and down type disc check valve should be installed on the level piping. Check valve belong to a kind of semi-automatic valve, its main effect is to avoid the media counter-current, avoid the pump and drive motor reversal, the discharge of the medium and vessels. Wafer check valves are suitable for use in the nominal pressure PN1. 0MPa~42. 0 mpa, Class150 ~ 25000; Nominal diameter DN15 ~ 1200 mm, NPS1/2 ~ 48; Office temperature - Various lines of 196 ~ 540 ℃, to avoid the media flow. Pump suction closed bottom valve also belong to the check valve class. Takeaway: check valve is called or a one-way valve, its utility is to avoid media flow pipeline. If the PVC pipe is likely to spoil pipelines, even may hurt, especially in the sun water heater system. Export pump with check valve, it will immediately shut down, to avoid the high pressure water reverse flow back to pump. 。 2, when installation, pay attention to the medium flow direction arrow should be provided with the valve body in the direction of the ticket are exactly the same. Check valve can also be used to give the pressure there could rise to more than the pipeline system pressure of the help system supply supplement. 3, straight up and down type disc check valve should be installed in vertical pipe runs. Open-close part by circulating medium strength to open or closed. Check valve nominal pressure or pressure, PN1. 0 - 16. 0MPa、ANSICLASS150- 900、JIS10- 20 k or nominal diameter diameter: DN15 ~ 900, NPS1/4 ~ 36 petition forms: flange, butt welding, turnbuckle, socket welding, suitable for use temperature: - Material: 196 ℃ ~ 540 ℃ body WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). 、CF3( 304L) 、CF8M( 316). 、CF3M( 316 l) 、Ti。 Up and down type check valve can be divided into vertical check valve and horizontal non-return valve two kinds. Check the main function is used to avoid pipeline medium counter-current invited.
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