I am new to Valves and need to know about the differences between various valve designs and when to use them. For example, when to use ball valve and when to use needle valve design.Then, if you can get a copy of them somehow, also the following standards may represent a useful reading: - EN 736-1:1995 Valves - Terminology - Part 1: Definition of types of valves; - EN 736-2:1997 Valves - Terminology - Part 2: Definition of components of valves; - EN 736-3:2008 Valves - Terminology - Part 3: Definition of terms. Valve selection depends on medium flowing trough your line, purpose(shut off or regulating), working conditions(temperature), actuation etc. There is a 'best' valve for every application, but every application is different and every valve type has lots of modificated variations. Selecting a perfect valve requiers much knowledge about valve types and possibilities to suit the flow.

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