Which type of check valve is most appropriate for handling liquids containing solids?

The most appropriate type of check valve for handling liquids containing solids is the flap check valve. This design features a hinged disk or flap that opens to allow flow in one direction and closes to prevent backflow. The flap is often streamlined, which helps reduce turbulence and allows for smoother flow even in the presence of particulates.

When dealing with liquids that contain solids, it's essential to minimize the risk of clogging and ensure that the valve can handle solid particles without significant wear or damage. The flap design allows for some degree of self-cleaning as the disc's movement helps to dislodge any solids that may accumulate. This capability makes flap check valves suitable for applications involving slurries or liquids with suspended solids, as they can better manage the challenge of solids passing through without inhibiting function.

Other valve types may not provide the same level of effectiveness in environments with solids. For instance, designs like 90-degree wing or stem-guided check valves might not handle solid particles as efficiently, potentially leading to clogging or mechanical failure. Therefore, the flap check valve is favored in such contexts to ensure reliable operation and longevity in service.