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. Non-return valve is an automatic valve, check valve is mainly used for medium flow of one-way pipeline, allowing only 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 through-type check valve, the above types of check valve in the connection form can be divided into threaded check valve, flange check valve and the three check valve. 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. The check valve only allows the medium to flow in one direction and prevents the flow in the opposite direction. Normally, the check valve is operated automatically. The valve flap opens under the pressure of the fluid flowing in one direction. When the fluid flows in the opposite direction, the flow is cut off by the fluid pressure and the weight of the valve flap and the valve flap acting on the valve seat. Check valves include swing check valves and lift check valves. Swing check valves have a hinged hinge mechanism, and a flap-like flap rests freely on the tilted seat surface. In order to ensure that each time the valve flap, valve seat surface to reach the appropriate position, the valve flap is set in the hinge mechanism, so that the valve flap has enough space to open, and the valve flap really and fully contact with the valve seat. The clamshell can be made entirely of metal, or it can be made of metal, leather, rubber, or synthetic cover, depending on the applicable performance requirements. Swing check valve in the fully open condition, the fluid pressure is almost unimpeded, so the pressure drop through the valve will be smaller. Lift the check valve flap is located on the valve seat sealing surface. In addition to the valve flap valve can be free to rise and fall, the rest of the same as the cut-off valve, the fluid pressure so that the valve flap from the valve seat sealing surface lifted, the media back to the valve seat caused by the return valve, and cut off the flow. According to applicable conditions, the valve flap can make all-metal body, but also can make the valve frame inlaid rubber pad, or rubber ring form. Like the stop valve, the passage of the fluid through the lift check valve is also narrow, so the pressure drop over the lift check valve is larger than the swing check valve and the flow through the swing check valve is affected Very few restrictions.
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