US Patent 8069653 Interchangeable nozzle for a dispensing module

A dispensing module having a dispenser body having a liquid passageway, a valve element movably mounted within the liquid passageway, and a nozzle removably coupled with the dispenser body. The nozzle has a valve seat contacted by a tip of the valve element for modulating liquid flow through the liquid passageway. The tip may be made of a harder material than the valve seat and may have a surface finish characterized by an Ra less than or equal to about 32 microinches. The tip may have a compound angle provided by contiguous frustoconical surfaces of differing included angles in which one frustoconical surface contacts the valve seat. The nozzle is configured to be attached to the dispenser body so that the valve seat and a sealing surface of the valve element tip form a circular line of contact when among multiple different nozzles and dispenser bodies.