Oscillating sprinkler assembly

A sprinkler assembly comprising:

• a body including an inlet configured for connection to a water supply;
• a riser movably mounted in the body and movable from a retracted position to an extended position;
• a nozzle housing rotatably mounted on a top of the riser;
• a pressure regulating assembly mounted at an inlet of the riser and operable to control a pressure of a flow of water into the riser from the inlet based on a downstream pressure;
• a bypass valve operable to control water flow;
• and
• a water turbine mounted downstream of the bypass valve such that the water contacts one or more blades of the water turbine to impart rotation when the bypass valve is in a closed position, wherein the one or more blades are operatively connected to the nozzle housing and drive rotation of the nozzle housing,
• wherein the pressure regulating assembly includes:
• a base mounted at the inlet of the riser;
• a pressure responsive element mounted downstream of the base and movable from a raised position where the flow of water between a bottom edge of the pressure responsive element and the base is substantially unimpeded and a lowered position where the flow of water between the lower edge of the pressure responsive element and the base is reduced such that the flow of water flow is restricted to reduce the downstream pressure;
• a stationary top ring;
• a stationary securing ring in contact with the pressure responsive element;
• and
• a biasing element positioned between the pressure responsive element and the stationary securing ring and configured to bias the pressure responsive element into the raised position,
• wherein the pressure responsive member moves toward the base when a pressure downstream of the bypass valve assembly exceeds a threshold value.