Swing check valve, also known as check valve or check valve, its role is to prevent the backflow of media in the pipeline. The opening and closing parts rely on the media flow and force to open or close themselves to prevent the backflow of the media valve called check valve. Check valve belongs to the automatic valve category, mainly used for one-way flow of media on the pipeline, allowing the media to flow in one direction only, in order to prevent accidents. This type of valve in the pipeline should generally be installed horizontally.
| DN | NB | Inner diameter of thread（mm） |
| DN15 | 1/2 | 19 |
| DN20 | 3/4 | 24 |
| DN25 | 1 | 30 |
| DN32 | 1 1/4 | 39 |
| DN40 | 1 1/2 | 44 |
| DN50 | 2 | 56.5 |
| DN65 | 2 1/2 | 72.5 |
| DN80 | 3 | 84.5 |
| DN100 | 4 | 110 |
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