One-way valve is that the fluid can only flow along the inlet, but the outlet medium can not be returned, commonly known as a one-way valve. The check-valve is also called a stop valve or an inverse valve. Used in hydraulic systems to prevent reverse flow of oil flow, or in pneumatic systems to prevent the reverse flow of compressed air. The one-way valve has two types, straight-through and right-angled. The straight-through check valve is mounted on the pipe path with a threaded connection.
The right-angled one-way valve has three forms of threaded connection, plate connection and flange connection.