Patent ID: 7458112

Claim:
A three-way rotary valve comprises: an inlet port, a first and second outlet ports; and an internal flow chamber having a first opening fluidly connected to said inlet port through a first passage way, a second opening fluidly connected to said first outlet port through a second passage way, a third opening fluidly connected to said second outlet port through a third passage way; and a plug having an upper cylindrical section, an eccentric midsection, and a lower cylindrical section, in which, the outer surface of said upper cylindrical section is provided with a lateral groove for receiving a first o-ring, the outer surface of said lower cylindrical section is provided with another lateral groove for receiving a second o-ring, and the outer surface of said eccentric midsection is provided with a peripheral groove for receiving a third o-ring; wherein: said plug being rotated within said flow chamber to a first position so that said eccentric midsection diverts flow from said inlet port to both said first and second outlet ports; and said plug being rotated within said flow chamber to a second position so that said eccentric midsection diverts flow from said inlet port to said first outlet port, and said third o-ring completely envelopes said third opening to stop leakage flow to said second outlet port; and said plug being rotated within said flow chamber to a third position so that said eccentric midsection diverts flow from said inlet port to said second outlet port, and said third o-ring completely envelopes said second opening to stop leakage flow to said first outlet port; and said plug being rotated within said flow chamber to a fourth position so that said third o-ring completely envelopes both said first and second openings, therefore, there is only a leakage flow diverted from said inlet port only to said first outlet port, and there is no flow, not even a minimum leakage flow, diverted to said second outlet port; and said first, second, third and fourth positions are equally separated within a 360 degree rotation.