Engineers... I am very new to this industry .. I Humbly request you to advise on valve material selection based on pipe material , I am Factory sales engineer so I always get trouble on this regard.... If you can advise me any article about this will be highly appreciable..

Your question is too general to give more than a general answer.

Roughly you can divide in two groups:

A. Common standard use for water, wastewater, non-corrosive fluids and more simple processes. The pipelines can vary in materials from GRP, plastics, iron, steels, protected, unprotected, stainless etc. The valves can and will vary in material not depending on material, and not depending on material on flanges or loose flanges, but selected on compability with fluid and according to necessary pressure class and certification.

This group will have 'normal practice' protection for possible galvanic corrosion between pipelines and valves (earthing, anodes or isolation).

B. Critical processes (example underwater, offshore processes, critical processes elsewhere). In such projects there will be special demands on material, material certification, construction, tests and certification, including demands on material compability to prevent galvanic corrosion both on pipelines and valves/ball valve, in addition to normal certification and special certification to comply with the process pressure and temperature.

A lot of applications will fall in between those descriptions, but will very often have a 'normal practice' of what is acceptable.

Example: If you have a stainless steel pipeline in a certain pressure class and ask for valves suitable for the given fluid and pressure class, you will often get the cheapest valve material offered, which could be epoxy coated nodular iron, or primed only common steel, as this could be adequate and with a long lifetime for the given application.

If you explicit want offered 'all stainless steel valves' for the pipeline(at 3-10 times the price) you have to state this. In such cases you should specify for different options of valve materials to be able to select, at least at planning/evaluation project stage.

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