Check valve, also known as one-way valve or check valve, its role is to prevent pipeline backflow of media. Water pump off the bottom valve also belongs to the check valve category. Opening and closing parts by the media flow and strength to open or close their own to prevent media backflow valve called the check valve. Check valves are automatic valves, mainly used for medium flow of one-way pipe, only allow medium to flow in one direction to prevent accidents. Check valve according to the structure, can be divided into lifting check valve, swing check valve and butterfly check valve three. Lift check valve can be divided into vertical check valve and horizontal check valve two. Swing check valve is divided into single-valve check valve, double-check valve and multi-valve check valve three. Butterfly check valve is straight-through check valve, the above types of check valve in the connection form can be divided into threaded connection check valve, flange connection check valve and welding check valve three. Check valve installation should pay attention to the following matters: 1, do not make the check valve in the pipeline to bear the weight of large check valve should be independent support, so that the impact of pressure from the pipe system. 2, when installing, pay attention to the direction of the flow of the medium should be consistent with the arrow direction of the body ticket. 3, vertical drop-check valve should be installed in the vertical pipe. 4, lift-level flap check valve should be installed on the level of the pipeline. Check valve nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K Nominal diameter or diameter: DN15 ~ 900, NPS 1/4 ~ 36 Connection: flange, butt welding, Thread, socket welding, etc. Suitable temperature: -196 ℃ ~ 540 ℃ Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L) Choose different materials, check valves can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media.
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