Installation location of the check valve: in front of or behind the valve

The main function of a check valve is to prevent fluid from flowing back, ensuring that the fluid can only move in one direction. In circulating water pipes, especially in the sections connected to the pumps, it is very important to ensure that check valves are in the correct positions to prevent fluid from flowing back when the pump stops. Normally, a check valve should be installed at the outlet end of the pump, that is, at the pump’s exit. In this way, when the pump stops operating, the check valve prevents fluid from flowing back into the pump, thereby avoiding potential damage to the pump as well as unnecessary shocks. As for the position of the valves (such as control valves or globe valves), generally, the check valve should be installed in front of the valve, that is, closer to the pump. In this way, when maintenance or other work needs to be carried out, the fluid can be stopped by closing the valve, while the check valve continues to protect the pump from backflow. Regarding the impact issue you mentioned, indeed, being subjected to impacts over a long period can lead to premature wear of the equipment. To reduce such impacts, you can consider the following measures: 1. **Buffering devices**: Consider installing buffering devices in the pipes, such as water hammer buffers, to reduce sudden pressure shocks. 2. **Flow rate control**: Ensure that the flow rate of the fluid remains within a reasonable range to avoid shocks caused by excessively high flow rates. 3. **Select appropriate materials and specifications**: Choose the right valves and check valves to ensure they can withstand potential impacts. 4. **Regular inspection and maintenance**: Regularly checking the operating condition of valves and check valves, and replacing any damaged parts in a timely manner, can **increase the service life of the equipment**. In summary, proper design, selection, and maintenance are key to ensuring the long-term stable operation of pipeline systems. .

Typically, check valves are installed at the pump outlet, followed by other types of valves that shut off the flow of fluid. This facilitates the maintenance of the check valve installation. For large-diameter valves, to prevent fluid impact, it is best to choose a \"soft-close check valve\" in order to avoid such impact. For reference.

Does a check valve need to be installed on the slurry pipeline, and is it prone to clogging?

Thank you so much! The valve materials and other items related to the site conditions have arrived at the site. There are two sets of water pumps, with three pumps in each set connected in parallel through pipes. The pump outlet pipes have diameters of 500 and 400. The valves used are carbon steel butterfly valves, while the check valves are noise-reducing H41X type check valves. Moreover, due to constraints related to installation space and operating conditions (the pumps are not necessarily used simultaneously; sometimes one or more pumps operate at reduced speed), our preliminary plan is to install the valves first and then the check valves, so that the check valves can be installed vertically ； The valve is located below, in a horizontal position, for easy operation. Now waiting for design confirmation or client approval

It depends; in the case of different dimensions, considering practical operations, it is generally not added； Even if you add it now, the property owner’s maintenance staff will remove it themselves later

And considering costs, valves are a bit more expensive than check valves, right?