Yes, PULSATING is a Scrabble word!

Letter values in Scrabble US: P 3, U 1, L 1, S 1, A 1, T 1, I 1, N 1, G 2.

Is it a valid word?

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

expand and contract rhythmically; beat rhythmically
move with or as if with a regular alternating motion
produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses