Ball Type Check Valve

If you are the Piping Material Engineer, writing the Piping Material Line Class Specifications you can select either the Ball Check (normally cheaper) or the Piston Check (normally more expensive) valve for a specific Line Class.

However if you are a Piping Designer doing piping layout you must use the valve that is in the Line Class Specification for that specific line you are working on. You cannot go out of "Spec" on your own!

Go here - www.dft-valves.com/pdf/literatur ... aSheet.pdf - and use this as a guide to make your own.