Can anyones tell me what is the difference between A105 & A216 . I tried to purchase A105 body type ball valve but they only offer A216 GR WCB and said it will be same material. Is this true .Cast Gate, Globe, Check Valves

ASTM A105 and A216-WCB (or their ASME SA equivalents) are two different product forms.  A/SA105 is a forged material specification while A/SA216-WCB is a cast material specification.  The chemical composition for each material is essentially the same (low carbon steel) but there may be some very minor differences in exact ranges of minor elements.  Get copies of both material specifications and check them out for yourself.Forged Gate, Globe, Check Valves

If you are purchasing a commercially mass produced valve then you will be subject to what the valve manufacturer produces or has in stock.  Valves 1/2" through 2" NPS are generally forged body valves.  If you are buying a valve larger than 2" NPS then you are generally going to get a cast body.Ball Valves  If you really want a forged valve body for your ball valve that is larger than 2" NPS, you will probably need to go to a specialty valve manufacturer and have one custom engineered to your specifications.  Such companies include Valvetron (Houston), Valvetech (Houston), and QAP (Oakland, CA), among others in the USA.  I am less familiar with companies outside of the US.Resilient Seated Gate Valves  There may be some companies that offer both cast and forged bodies for ball valves in sizes larger than 2" NPS without going the custom engineering route but I am not personnally familiar with any.

Evaluate your application and judge whether a cast body will work for you or if you still need a forged body.Automatic Control Valves 
A105 is forged, 206WCB is a casting steel.
Keep in mind that the defects aren't the same none the method of detecting them.
With WCB material body will be thicker than with A105 (factor of 0.8 and the low mechanical properties for casting ).

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