F-type self closing valve and U-type self closing valve are common Marine self-closing valves, and their differences are mainly manifested in valve structure, installation mode, use scenarios and other aspects.

F type - straight - type marine self closing drawin valve

U type - elbow type marine self closing drain valve

Structural Form: the structural form of U-type self-closing valve is U-shaped, while the structural form of F-type self-closing valve is F-shaped.

Use Scenarios: U-type self-closing valves are suitable for smaller piping systems, while F-type self-closing valves are suitable for larger piping systems.

Effect: the U-type self-closing valve has a more reliable self-closing effect and can effectively prevent the backflow of media; The self - closing effect of F - type self - closing valve is relatively weak.

Installation: U-type self-closing valves are usually installed in the horizontal position of the pipe, while F-type self-closing valves are usually installed in the vertical position of the pipe.

In general, the U-type self-closing valve is superior in self-closing effect and reliability, and is suitable for smaller piping systems; The F-type self-closing valve is suitable for larger piping systems, but the self-closing effect is relatively weak. The choice of self-closing valve should be determined according to the specific piping system situation and requirements.