Patent ID: 7182229

Claim:
A device for dispensing a viscous liquid, comprising: a dispenser body having a liquid passage and an air passage, said liquid passage including a liquid inlet for receiving the liquid and a discharge outlet for dispensing the liquid, said liquid inlet and said discharge outlet in fluid communication with said liquid passage, said air passage including an air inlet in fluid communication with said air passage for supplying pressurized air; a valve stem mounted within said dispenser body and adapted to move relative to said dispenser body between an open position allowing liquid flow from said discharge outlet and a closed position preventing liquid flow from said discharge outlet; and a pre-assembled, unitary seal assembly positioned within said dispenser body between said liquid passage and said air passage, said seal assembly comprising: a housing having an outer surface with threads removably coupling said housing with said dispenser body, said housing having a proximal end, a distal end, and a bore extending from said proximal end to said distal end, said bore receiving a portion of said valve stem; a first seal member positioned within a first portion of said bore and forming a dynamic seal with said valve stem, thereby preventing air from leaking out of said air passage; a second seal member positioned within a second portion of said bore and forming a dynamic seal with said valve stem, thereby preventing liquid from leaking out of said liquid passage; and a static seal between said housing and said dispenser body for preventing liquid from leaking out of said liquid passage.