Editing Valve (section)

===Three-port valves===
[[File:3-way.svg|120px|thumb|right|Schematic 3 way ball valve: L-shaped ball right, T-shaped left]]
Valves with three ports serve many different functions. A few of the possibilities are listed here.

[[Ball valve#Multiport|Three-way ball valves]] come with T- or L-shaped fluid passageways inside the rotor. The T valve might be used to permit connection of one inlet to either or both outlets or connection of the two outlets. The L valve could be used to permit disconnection of both or connection of either but not both of two inlets to one outlet.

''[[Shuttle valve]]s'' automatically connect the higher pressure inlet to the outlet while (in some configurations) preventing flow from one inlet to the other.

''[[Tap (valve)#immutable link from Valve|Single handle mixer valves]]'' produce a variable mixture of hot and cold water at a variable flow rate under control of a single handle.

''[[Thermostatic mixing valve]]s'' mix hot and cold water to produce a constant temperature in the presence of variable pressures and temperatures on the two input ports.