Yes, PERCOLATING is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, R 1, C 3, O 1, L 1, A 1, T 1, I 1, N 1, G 2.

Is it a valid word?

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

permeate or penetrate gradually
spread gradually
prepare in a percolator
cause (a solvent) to pass through a permeable substance in order to extract a soluble constituent
pass through
gain or regain energy

Also: sink in, perk up, pick up, gain vigor.