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An irrigation sprinkler includes a riser and a nozzle rotatably mounted at an upper end of the riser. A gear train reduction is mounted in the riser and a turbine is coupled to the gear train reduction for rotation by water entering a lower end of the riser. A gear driven coupling mechanism mounted

An irrigation sprinkler includes a riser and a nozzle rotatably mounted at an upper end of the riser. A gear train reduction is mounted in the riser and a turbine is coupled to the gear train reduction for rotation by water entering a lower end of the riser. A gear driven coupling mechanism mounted in the riser couples the gear train reduction and the nozzle. A pressure regulator is mounted in the riser and is adjustable from a top-side of the sprinkler.

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1. An irrigation sprinkler, comprising: a riser;a nozzle turret rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;a gear driven coupling mechanism mounted i

1. An irrigation sprinkler, comprising: a riser;a nozzle turret rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;a gear driven coupling mechanism mounted in the riser and coupling the gear train reduction and the nozzle turret; anda pressure regulator having a valve portion mounted in the riser adjacent a passage that provides a water flow path to the nozzle, the pressure regulator including a valve body movable relative to at least one water flow port to increasingly obstruct the at least one water flow port, a spring connected to bias the valve body to affect a pressure of the water at an entrance of a nozzle in the nozzle turret, and an air flow path separated from the water flow path that vents the valve portion of the pressure regulator to ambient air pressure;wherein the spring that biases the valve body is mounted in the nozzle turret. 2. The sprinkler of claim 1 wherein the gear driven coupling mechanism includes a bull gear and the valve portion is mounted in a sleeve extending from the bull gear. 3. The sprinkler of claim 1 wherein the gear driven coupling mechanism includes a reversing mechanism. 4. The sprinkler of claim 1 wherein the valve portion includes a valve seat having the at least one water flow port formed therein and the valve body can slide relative to the valve seat. 5. The sprinkler of claim 1 and further comprising a vent tube that extends from the valve body through the nozzle turret and provides the air flow path. 6. The sprinkler of claim 1 and further comprising an adjustment mechanism mounted in the nozzle turret including a screw accessible from a top-side of the nozzle turret and rotatable to reduce an area wetted by the sprinkler. 7. The sprinkler of claim 6 wherein the adjustment mechanism includes a holder mounted for vertical reciprocation in the nozzle turret, the spring biases the holder upwardly, and a vent tube connects the holder and the valve body. 8. The sprinkler of claim 1 wherein the valve portion is mounted between the gear train reduction and the nozzle turret and a vent tube is connected to the valve portion for placing a chamber adjacent the valve portion at ambient air pressure. 9. The sprinkler of claim 6 wherein the screw of the adjustment mechanism can be turned to shut off flow of water through the nozzle. 10. An irrigation sprinkler, comprising: a riser;a nozzle rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser and coupled to rotate the nozzle;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;an automatic pressure regulator mounted in the riser; andwherein the nozzle is mounted in a turret and the pressure regulator includes a holder mounted for vertical reciprocation in the turret, a spring biasing the holder upwardly, a valve portion mounted in a flow path of the sprinkler above the gear train reduction, and a vent tube connecting the holder and a valve body of the valve portion. 11. The sprinkler of claim 10 wherein the pressure regulator is configured for reducing a radius of a wetted area by reducing a maximum flow of the water entering the nozzle. 12. The sprinkler of claim 10 wherein the valve portion includes a valve seat and the valve body is moveable relative to the valve seat. 13. The sprinkler of claim 10 and further comprising a screw accessible on a top-side of the turret, the screw being manually rotatable to adjust the valve portion. 14. The sprinkler of claim 10 wherein the valve portion is mounted in a sleeve connected to a bull gear. 15. The sprinkler of claim 10 wherein the vent tube is connected to the valve portion for placing a chamber adjacent the valve portion at ambient air pressure. 16. The sprinkler of claim 10 wherein the pressure regulator can be adjusted to shut off flow of water through the nozzle. 17. The sprinkler of claim 10 and further comprising a gear driven coupling mechanism mounted in the riser and coupling the gear train reduction and the turret. 18. The sprinkler of claim 12 and further comprising an O-ring positioned between the valve body and the valve seat. 19. An irrigation sprinkler, comprising: a riser;a nozzle rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser and having an input shaft;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;a gear driven coupling mechanism mounted in the riser and coupling the gear train reduction and the nozzle;a pressure regulator mounted in the riser and remotely vented from a top-side of the sprinkler; andwherein the nozzle is mounted in a turret and the pressure regulator includes a holder mounted for vertical reciprocation in the turret, a spring biasing the holder upwardly, a valve portion mounted in a bull gear stem of the gear drive coupling mechanism, and a vent tube connecting the holder and a valve body of the valve portion. 20. An irrigation sprinkler, comprising: a riser;a nozzle turret rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;a gear driven coupling mechanism mounted in the riser and coupling the gear train reduction and the nozzle turret;a pressure regulator having a valve portion mounted in the riser adjacent a passage that provides a water flow path to the nozzle, the pressure regulator including a valve body movable relative to at least one water flow port to increasingly obstruct the at least one water flow port, a spring connected to bias the valve body to affect a pressure of the water at an entrance of a nozzle in the nozzle turret, and an air flow path separated from the water flow path that vents the valve portion of the pressure regulator to ambient air pressure; anda vent tube that extends from the valve body through the nozzle turret and provides the air flow path. 21. An irrigation sprinkler, comprising: a riser;a nozzle turret rotatably mounted at an upper end of the riser;a gear train reduction mounted in the riser;a turbine coupled to the gear train reduction and rotatable by water entering a lower end of the riser;a gear driven coupling mechanism mounted in the riser and coupling the gear train reduction and the nozzle turret;a pressure regulator having a valve portion mounted in the riser adjacent a passage that provides a water flow path to the nozzle, the pressure regulator including a valve body movable relative to at least one water flow port to increasingly obstruct the at least one water flow port, a spring connected to bias the valve body to affect a pressure of the water at an entrance of a nozzle in the nozzle turret, and an air flow path separated from the water flow path that vents the valve portion of the pressure regulator to ambient air pressure; andan adjustment mechanism mounted in the nozzle turret including a screw accessible from a top-side of the nozzle turret and rotatable to reduce an area wetted by the sprinkler.