Butterfly bypass valve

A fluid valve for supplying pressurized fluid to a vehicle heating system heater core, said valve comprising:

• (a) body means, said body means defining
• (i) an elongated fluid passageway,
• (ii) first and second fluid ports in communication with said fluid passageway, said first and second fluid ports being disposed on opposite sides of said valve body,
• (iii) a third fluid port in fluid communication with said fluid passageway and spaced longitudinally therealong from said first and second fluid ports,
• (iv) a fourth fluid port in fluid communication with said fluid passageway and spaced longitudinally therealong from said first and second fluid ports,
• (b) a valve member rotatably mounted to said valve body and located in said fluid passageway intermediate said first and second fluid ports, said valve member rotatable between a first position in fluid sealing engagement with first portions of said passageway and a second position in fluid sealing engagement with second portions of said passageway, such that in said first position said valve member permits fluid flow through said first port to flow through said fourth fluid ports and flow through said second port to flow through said third fluid port, and in said second position said valve member permits fluid flow through said first port to flow through said third fluid ports and through said second and fourth fluid ports;
• (c) said first and second ports are located generally at a first longitudinal station along said passageway defined by said valve member;
• (d) said third and fourth ports are located generally at a second longitudinal station relative said passageway, said fourth port being in direct fluid communication with said passageway;
• and
• (e) said body means further including auxiliary passageway means for communicating said third port with said elongated passageway at a location remote from said first longitudinal station.