The right-angle check valve means that the fluid can only flow along the water inlet, but the medium at the outlet cannot flow back. The one-way valve is also called a check valve or check valve. It is used in hydraulic systems to prevent reverse flow of oil flow, or in pneumatic systems to prevent reverse flow of compressed air. There are two types of check valves: straight-through type and right-angle type. The straight-through check valve is installed on the pipeline with a threaded connection. Right-angle check valves are available in three forms: threaded connection, plate connection and flange connection.