DEVICE FOR DISPENSING LIQUID HAVING AN IMPROVED SEAL ASSEMBLY

摘要

A device for dispensing a liquid includes a dispenser body having a liquid passage and an air passage. A valve stem is mounted in the dispenser body and reciprocates between an open position allowing liquid flow and a closed position preventing liquid flow. A pre-assembled unitary seal assembly is threadably engaged with the dispenser body and includes a housing having a bore therethrough. The housing includes a first and second seal members positioned within the bore that each form a dynamic seal with the valve stem to prevent air and liquid from leaking out of the air and liquid passages. The housing further includes a static seal between the outside of the housing and the dispenser body. The valve stem may be moved to an open position by pressurized air acting on a piston and moved to the closed position by a spring-return mechanism to selectively dispense the liquid.