Patent ID: 6935372

Claim:
A semiconductor processing reactive precursor valve assembly comprising: a valve body having at least first and second inlets and at least two outlets, the first and second inlets being configured for connection with distinct gas sources at least one of which is a deposition precursor, a first of the outlets being configured for connection with a feed stream to a semiconductor substrate processor chamber, a second of the outlets being configured for diverting gas flow away from said chamber; a generally cylindrical mass mounted for at least limited rotation within the body; the generally cylindrical mass comprising a first longitudinal portion configured to provide the first inlet in fluid communication with the first outlet when in a first selected radial orientation and to provide the first inlet in fluid communication with the second outlet when in a second selected radial orientation; and the generally cylindrical mass comprising a second longitudinal portion proximate the first longitudinal portion and which is configured to provide the second inlet in fluid communication with the first outlet when in the second selected radial orientation and to provide the second inlet in fluid communication with the second outlet when in the first selected radial orientation.