Patent ID: 8535051

Claim:
A four-way valve for alternating between a first cycle with a fluid flowing in a first direction and a second cycle with the fluid flowing in a second direction, comprising: a housing having an open interior and a partition dividing said open interior into an input zone and an output zone, said housing including a first input aperture and a second input aperture spaced from and aligned with one another and in fluid communication with said input zone, said housing including a first output aperture and a second output aperture spaced from and aligned with one another and in fluid communication with said output zone of said housing, a first damper movably disposed in said input zone of said housing for selectively closing said first and second input apertures and a second damper movably disposed in said output zone for selectively closing said first and second output apertures, and each of said dampers being operably coupled to a driven arm for selectively opening and closing the associated input and output apertures and an undriven arm for maintaining the associated damper in a predetermined orientation throughout its range of motion.