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three-way valve definition
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a type of shutoff valve having two extreme positions, each of which either (1) directs an incoming single-gas stream to one of two alternate outlet ports, or (2) directs two different incoming gas streams alternately to a single outlet port. Some designs of three-way valves incorporate a position in which all ports are closed to flow. [SEMI Chemicals/Gases, Vol. 1, 1990 (no longer in print)]

See also:
Three-dimensional Quantitative Structure-Activity Relationship (3D-QSAR) definition
thermionic emission definition
theoretical cycle time definition
thermal deposition definition
threshold limit value (TLV) definition
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