Check / Relief / Excess Flow Valves
Check valves are two-port valves, which means they have two openings in the body, one for fluid to enter and the other for fluid to exit. There are several types of check valves used in a wide variety of applications.
Check valves are often part of common household items. Although available in a wide range of sizes and costs, check valves are generally very small, simple, or inexpensive.
Check valves operate automatically and most are not controlled by a person or any external control; consequently, most do not have a handle or valve stem.
To download "catalog" click on the product link, or on the image.