Why do water pumps need to be equipped with check valves?

The reason why water pumps need to be equipped with check valves is to prevent water hammer and backflow. In terms of preventing water hammer, a water pump equipped with a check valve can effectively prevent water hammer from occurring, thereby avoiding damage to pipelines and water pumps caused by water hammer. In terms of preventing backflow, if a check valve is installed at the outlet of the water pump, the water pump can only pump water out, and the water cannot flow into the water pump in the reverse direction. This can avoid a sudden power outage when the water pump is working, causing high pressure. The water flows into the water pump in the opposite direction, avoiding damage caused by the reverse pump.

where to install check valve on water pump

When installing a check valve on a water pump, there are generally two installation methods. The first is installed at the end of the vertical suction pipe in front of the pump, commonly known as the bottom valve. The second type is installed after the pump. Let me introduce to you the respective characteristics of these two installation methods.

The characteristic of the first installation method (installed at the end of the vertical suction pipe in front of the pump) is that even if there is no water in the water pump or there is no water in the suction pipe in front of the pump, the water pump will not be idling and unable to pump water. If our water pump is located higher than the liquid level, then the first installation method is very suitable.
The characteristic of the second installation method (installed after the pump) is that if the liquid level is higher than the water pump position, then the second method is very suitable because we install the check valve after the water pump to prevent backflow. The second installation method is not only convenient for turning on and off the water pump, but also does not matter if the water pump outlet valve is not turned off when the water pump stops working.

Advantages and disadvantages of check valve before or after pump

The advantages of the check valve before pump installation method are simple structure and easy installation, which can avoid idling of the water pump and extend the life of the water pump. The disadvantage of check valve before pump is that it is only applicable when the water pump position is higher than the liquid level, and the applicable range is narrow. The advantage of the check valve after pump installation method is that it is convenient to switch the water pump on and off and can prevent backflow. It is suitable when the liquid level is higher than the water pump position. The disadvantage of check valve after pump is that the daily maintenance and repair of the water pump may be a little more complicated. Which installation position you choose specifically depends on the actual situation of your water pump position and liquid level position.

What are the precautions when installing check valve on water pump

Note 1: Each check valve is marked with the direction of an arrow. When installing the check valve, we need to install it in the direction of the flow of the pipeline.
Note 2: Before buying a check valve, you need to determine the size of the pipe first, and then choose the check valve of the corresponding size and model based on that size.
Note 3: When installing the check valve, it is necessary to ensure the sealing of the connecting part to avoid water leakage.
Note 4: Before installing the check valve, you need to clean up the debris and dirt in the pipeline.
Note 5: When installing the check valve, you need to check the stability of the check valve bracket and do not allow it to be subject to additional pressure or vibration.
Note 6: When installing a check valve on a water pump, try not to choose a place close to the motor or power line.
Note 7: After installing the check valve on the water pump, you need to test whether the check valve is working properly.
Note 8: After using for a period of time, the wear of the check valve needs to be checked frequently. If the wear of the check valve is found to be large, it needs to be replaced in time.