1. In order to prevent the medium from flowing back, a check valve should be installed on the equipment, equipment and pipelines;
2. Check valves are generally suitable for clean media and should not be used for media containing solid particles and viscosity penetration;
3. Generally, the vertical lifting check valve should be replaced on the horizontal pipe with a nominal 50mm pass;
4. Straight turbine lift check valves can be installed on both horizontal and vertical pipes;
5. For the inlet pipe of the water pump, the bottom valve should be replaced. The bottom valve is generally installed only on the vertical pipe of the pump inlet, and the medium flows from bottom to top;
6. Lifting type rotary sealing type is good, fluid resistance is large, horizontal type should be installed on horizontal pipe, and vertical type is installed on vertical pipe;
