Are translations valuable to Phd admission committees? I am really interested in translating academic material to my mother tongue. However the other day, I was talking with a professor and he advised me cease translating and start writing research papers if I want to continue my studies and start a PhD, he pointed out translation is of no value to English academicians!

I know it is very important to show your research capabilities by actually doing so but I feel shocked and a bit disappointed if this is true about the attitude towards translating academic material.

Would you tell me what you think on this and whether you think by translating I am spending my time in a wrong area?

I need to add that I am going to start my PhD outside my home country and probably in an English-speaking country.
Unless you're in the humanities, where the ability to translate source materials may be a critical need, what you're doing would be considered an example of a "service activity." You can certainly list such an activity on your CV and applications, but its impact on an admissions committee decision will be minuscule. You're much better off, as your advisors suggested, producing original research results.

Moreover, if you're planning to study in an English-speaking country, you will want to spend time improving your written and oral communication skills, rather than translating materials into your native tongue.