Patent ID: 7600700

Claim:
A fluid delivery system comprising: a housing; a nozzle; one of said housing and said nozzle including a shaft extending into a cavity, said nozzle rotating relative to said housing; a structure defining an end face of said cavity, and said shaft extending through a bore in said structure and into said opening; a seal received between an outer surface of said shaft and an inner surface of said cavity, said seal having a forward face abutting said structure to provide an outer seal point between said seal and said structure, and said seal further sealing on an outer peripheral surface of said shaft; said seal being dimensioned such that there is a clearance between an outer periphery of said seal and the inner surface of said cavity; and one of said housing and said structure including a recess receiving a back-up seal, said back-up seal creating a seal blocking fluid flow from said clearance passing said back-up seal.