Abstract: A fluid pressure regulator includes a cylinder fixed within a cavity, a sealing disc carried at the closed end of the cylinder, and a piston displaceable within the cylinder, the interior of the cylinder being vented to the atmosphere. The piston is of larger cross-sectional area than the sealing disc and has a stem of smaller cross-sectional area than, and passing through, the sealing disc. The stem carries a valve member movable by the displacement of the piston, from a fully open position towards and away from a flow control opening to control the flow therethrough to the housing outlet.

Abstract: A rotary sprinkler includes a rotably-mounted sprinkler head, an oscillating arm for impacting the sprinkler head to impart a rotary motion thereto, a spring urging the oscillating arm in one direction, and a reaction member carried by the oscillating arm and having an inlet alignable with the discharge nozzle for receiving the water jet, and an outlet laterally of the inlet for imparting a rotary motion to the oscillating arm in the opposite direction by reaction. The reaction member includes a cylindrical tube bent to define a single helical loop which produces a helical path of travel of the water from its inlet to its outlet extending laterally of the discharge nozzle.

Abstract: An area pattern controlled sprinkler comprises a nozzle rotatably mounted about a vertical axis through the sprinkler and driven by the energy of the water in the pressurized water supply line, a plunger also driven by the pressurized water to restrict and enlarge the nozzle, and a cam member controlling the displacement of the plunger so as to produce a water distribution pattern of predetermined configuration around the sprinkler.