Yes, TAPS is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, P 3, S 1.

Is it a valid word?

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

(military) signal to turn the lights out
the sound made by a gentle blow
a gentle blow
a faucet for drawing water from a pipe or cask
a small metal plate that attaches to the toe or heel of a shoe (as in tap dancing)
a tool for cutting female (internal) screw threads
a plug for a bunghole in a cask
the act of tapping a telephone or telegraph line to get information
a light touch or stroke

cut a female screw thread with a tap
draw from or dip into to get something
strike lightly
draw from; make good use of
tap a telephone or telegraph wire to get information
furnish with a tap or spout, so as to be able to draw liquid from it
make light, repeated taps on a surface
walk with a tapping sound
dance and make rhythmic clicking sounds by means of metal plates nailed to the sole of the dance shoes
draw (liquor) from a tap
pierce in order to draw a liquid from
make a solicitation or entreaty for something; request urgently or persistently

Also: lights-out, water faucet, water tap.

Not playable in Scrabble US: TAPDANCE.