Check valve is to rely on the media itself to automatically open and close the valve, used to prevent the media back to the valve, also known as check valve, check valve, counter valve, and back pressure valve. Check valve is an automatic valve, its main role is to prevent the media back to prevent the pump and drive the motor reversal, and the container media discharge.
The opening and closing of the medium by the flow of power to open or close itself to prevent the media back to the valve called the check valve. Check valve is an automatic valve, mainly for the media on the one-way flow of the pipeline, only to allow the media to flow in one direction to prevent accidents.
Check valve by structure, can be divided into lift check valve, swivel check valve and butterfly check valve three:
1. Lifting check valve is divided into vertical and horizontal two.
2. Swing check valve is divided into single-valve, double-valve and multi-valve type three.
3. The butterfly check valve is straight type.
More than a few check valves in the form of connection can be divided into threaded connection, flange connection, welding connection and folder to connect four.
Check valve installation should pay attention to the following matters
1, in the pipeline system do not let the check valve to bear the weight, large check valve should be independent support, so that the pressure generated by the pipeline system.
2, the installation of attention to the direction of media flow should be consistent with the direction of the valve body arrow.
3, lift vertical valve check valve should be installed in the vertical pipe.
4, lift the level of the valve check valve should be installed in the horizontal pipe.
Check valve material
1. cast iron check valve
2. brass check valve
3. Stainless steel check valve
4. Carbon steel check valve
5. Forged steel check valve