Yes, PURIFIES is a Scrabble word!

Letter values in Scrabble US: P 3, U 1, R 1, I 1, F 4, I 1, E 1, S 1.

Is it a valid word?

PURIFIES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

remove impurities from, increase the concentration of, and separate through the process of distillation
make pure or free from sin or guilt
become clean or pure or free of guilt and sin

Also: make pure.