Summary of the check valve

Summary of the check valve also known as a one-way valve or check valve non-return valve, its role is to prevent the backflow medium pipeline. Pump suction off the bottom of the valve also belong to the check valve class. Open-close part by medium flow and power to open or closed, to prevent the backflow medium valve door is called the check valve. Check valve belong to automatic valve class, the check valve is mainly used for one-way flow of medium pipeline, only allowed to medium flows in one direction, in order to prevent accidents. The check valve according to its structure, can be divided into the lift check valves, swing check valve and butterfly check valve in three. Can be divided into vertical lift check valve check valve and two horizontal non-return valve. Swing check valves can be divided into single type check valve, double disc type check valve and three kinds of disc type check valve. Butterfly check valve for straight-through non-return valve, the above several kinds of check valve in the connection form can be divided into the threaded connection check valve, flange check valves and non-return valve welding of three. Check valve installation should pay attention to the following things: 1, do not make check valve in the line to bear weight, large check valve shall be independent support, make it not influenced by the pressure caused by the piping. 2, when installation should pay attention to the medium flow direction arrow with valve body by the ticket in the same direction. 3, vertical elevating disc check valves should be installed in vertical pipe runs. 4, elevating disc check valves should be installed in horizontal pipe runs. Check valve nominal pressure or pressure, PN1. 0 - 16. 150 - 0 mpa, ANSI类 900、JIS10- 20 k or nominal diameter diameter: DN15 ~ 900, NPS 1/4 ~ 36 connection mode: flange, butt welding, thread, socket and other applicable temperature: - 196 ℃ ~ 540 ℃ of the valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). 、CF3( 304L) 、CF8M( 316). 、CF3M( 316 l) 、Ti。 Choose different material, the check valve can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media.