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The check valve is divided into structures according to the structure, and can be divided into three types: a lift check valve, a swing check valve and a butterfly check valve. Lift check valves can be divided into vertical check valves and horizontal check valves. The swing check valve is divided into a single-valve check valve, a double-valve check valve and a multi-valve check valve. The butterfly check valve is a straight-through check valve. The above-mentioned check valves can be divided into three types: a threaded check valve, a flanged check valve and a welded check valve.
The installation of the check valve should pay attention to the following matters: 1. Do not allow the check valve to bear the weight in the pipeline. The large check valve should be independently supported so as not to be affected by the pressure generated by the piping system. 2. Pay attention to the direction of media activity during installation and the direction of the arrow of the valve body. 3. The lifting vertical flap check valve should be installed on the vertical pipe. 4. The lift horizontal flap check valve should be installed on the horizontal pipe.
Nominal pressure or pressure rating of check valve: PN1.0-16.0MPa, ANSICLASS150-900, JIS10-20K Nominal diameter or caliber: DN15～900, NPS1/4～36 Connection: flange, butt weld, thread, bearing Suitable temperature for plug welding, etc.: -196 ° C ~ 540 ° C Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Different materials are used, and the check valves can be applied to various media such as water, steam, oil, nitric acid, acetic acid, oxidizing medium and urea.
Check valve: Check valve, also known as check valve or check valve, is used to prevent backflow of media in the pipeline. The bottom valve of the water pump suction is also a check valve. The valve of the opening and closing member is opened or closed by the medium activity and the pneumatic force to prevent the back flow of the medium from being called the check valve. The check valve belongs to the automatic valve type. The check valve is mainly used on the pipeline with one-way activity of the medium, and only allows the medium to move in one direction to prevent accidents.