A check valve refers to a type of valve whose opening and closing components are circular valve discs that act by their own weight and medium pressure to block medium backflow. It belongs to the category of automatic valves, also known as check valves or one-way valvesReturn valve or isolation valve. The valve disc movement can be divided into lifting and rotating types. Lift check valves have a similar structure to globe valves, except for the lack of a valve stem that drives the valve disc. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure exceeds the sum of the weight of the valve disc and its flow resistance, the valve is opened. On the contrary, when the medium flows back, the valve closes.

precautions

1. Do not let check valves bear weight in the pipeline system. Large check valves should be independently supported to prevent them from being affected by the pressure generated by the pipeline system.

2. During installation, pay attention to the direction of medium flow, which should be consistent with the arrow direction marked on the valve body.

3. Lift type vertical flap check valves should be installed on vertical pipelines.

4. Lift type horizontal disc check valves should be installed on horizontal pipelines.