Yes, VAN is a Scrabble word!

Letter values in Scrabble US: V 4, A 1, N 1.

Is it a valid word?

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

any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts)
the leading units moving at the head of an army
(Great Britain) a closed railroad car that carries baggage or freight
a camper equipped with living quarters
a truck with an enclosed cargo space

Also: avant-garde, new wave.