Check valve definition, classification and structure types characterized Analysis

Check valve is to rely on the flow of the medium itself automatically open and close the valve, the valve is used to prevent the media back.
Check valve can be divided according to their structure:

A lift check valve: the valve body along the vertical centerline sliding valve, lift check valve can only be installed in horizontal pipelines, the high-pressure small-bore ball valve on the valve can be used . Lift check valve of the same body shape (with cut-off valve common), so it's fluid resistance coefficient.

Second, the swing check valve: the valve seat around the outside of the pin rotating valve, swing check valve of more general use.

Third, the disc valve: the valve seat within the pin rotation around the check valve. Disc check valve structure is simple, can only be installed in horizontal pipelines, poor sealing.

Fourth, the pipeline valve: the valve slide along the centerline of the valve body. Pipeline valve is emerging as a valve, its small size, light weight, good processing, is one of valve development. However, the fluid drag coefficient slightly larger than the swing check valve.