Available range of designs are conventional globe swing check type, pressure seal and wafer styles.
Check valves are serialised products being some parts interchangeable to other valve types to increase assembly flexibility.
Check valves are uni-directional valves and of self acting fluid operation being widely used in power, chemical and oil industry.
Pressure seal valves are used for high temperature – high pressure service, specially on power plants.

Other designs and options:
Counter weight , minimum opening pressure device.