Check Valve (Check Valve) divided by structure, can be divided into lift check valve, swing check valve and disc check valve three. Lift check valve can be divided into vertical and horizontal two. Swing check valve is divided into single-valve, double-valve and multi-valve three. Butterfly check valve is straight-through, the above types of check valve in the connection form can be divided into thread connection, flange connection and welding three. Check valve installation should note the following: 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 piping system. 2, when installing, pay attention to the direction of the medium flow should be consistent with the arrow direction of the valve body. 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. The use of non-return valve to prevent the reverse flow of media section.
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