Adjustable arc of coverage cone nozzle rotary stream sprinkler

A sprinkler head nozzle assembly comprising:

• a nozzle housing including an inlet for pressurized water and an outlet downstream of the inlet;
• a rotating arc adjustment ring mounted on the nozzle housing such that rotation of the arc adjustment ring extends and reduces an arcuate exit opening to set an arc of coverage of the sprinkler head nozzle assembly;
• a rotating range adjustment ring mounted on the housing upstream of the arc adjustment ring such that rotation of the range adjustment ring increases and decreases a downstream flow area to control flow of water to the arcuate exit opening;
• and
• a rotating distributor, mounted on a central shaft extending through an arcuate adjustable nozzle including a valve assembly positioned below the rotating distributor in the nozzle housing and operable to direct water onto the rotating distributor;
• the valve assembly further comprising:
• an upper valve element including a top portion with a conical stepped and spiraled underside valve surface;
• and
• a lower valve member including a central opening and an upper stepped and spiraled top valve surface surrounding the central opening, the upper valve member mounted in the lower valve member such that the lower valve member is movable relative to the upper valve member such that interaction between the upper stepped and spiraled underside valve surface of the upper valve member and the lower stepped and spiraled top valve surface of the lower valve member defines the arcuate exit opening to provide a conically shaped water discharge stream over a desired arc of coverage when water flows through the valve assembly.