Unidirectional pressure butterfly valve refers to the butterfly plate front closed, facing the media flow over the flow direction; unidirectional butterfly valve installed in the pipeline media flow in one direction only, unidirectional butterfly valve valve body has an arrow indicating the direction of flow of the media, the installation of the medium should pay attention to the direction of flow of the media. If the installation is reversed, it will cause internal leakage of the valve body.
Bidirectional pressure butterfly valve is not affected by the direction of flow of media, butterfly plate on both sides can bear pressure, do not need to pay attention to the direction of flow of media during installation, there is no indication of the direction of flow of media arrows on the valve body.
Unidirectional pressure butterfly valves are mainly: double eccentric butterfly valve, three eccentric butterfly valve.
Bidirectional pressure butterfly valve: centerline butterfly valve.
