Available range of designs are Wafer, lug and double flanged.
Wafer Check valves are the economical and lighter version of the conventional globe type design.
Plates are spring loaded and can be soft or hard sealed.
Check valves are uni-directional valves and of self acting fluid operation being widely used in power, chemical and oil industry.
The range of available materials and sizes are larger than other conventionally built valves thus becoming a more demanding style in the power, chemical, oil and gas industry.

Other designs and options:
Counter weight.