An API 598 Wafer Check Valve is a type of wafer check valve that conforms to the API 598 standard, which outlines the inspection and testing requirements for resilient-seated, nonmetallic-seated, and metal-to-metal-seated valves. This valve is designed to be installed between two pipeline flanges and allows fluid to flow in one direction while automatically closing to prevent reverse flow. It is commonly utilized in applications with limited space and serves as an essential component for protecting pumps and other equipment from damage caused by backflow.