Pressure regulating nozzle assembly

摘要

An irrigation sprinkler nozzle assembly including a pressure regulator having a low friction seal for a riser assembly in which the regulator is installed. The pressure regulator includes a movable portion, a fixed portion located upstream of the movable portion, and connectable to a water inlet, and a biasing member such as a spring which applies a force to the movable portion according to a pressure differential between the water inlet pressure and a reference pressure. The fixed and movable portions move relative to each other according to the force provided by the biasing member to provide a variable flow restriction which maintains the desired pressure. The low friction seal is a diaphragm connected at one end to the movable member and anchorable at another end in the nozzle head.

主权项

1. An irrigation sprinkler nozzle assembly comprising:
a nozzle head including a nozzle spray outlet, and an outlet flow path coupled to the nozzle spray outlet; a filter attached to the nozzle head, the filter including a top wall with an upper thread formed on the top wall and configured to attach the filter to the nozzle head, the top wall including a reference opening formed therein to provide a reference pressure, the reference opening positioned in the top wall in the area of the upper thread; and a pressure regulator located just upstream of the outlet flow path and entirely within the filter, the pressure regulator including:
a movable portion;a fixed portion located upstream of the movable portion, and connectable to a water inlet;a biasing member for applying a force to the movable portion to maintain a desired pressure differential between a nozzle spray outlet pressure and a reference pressure;the movable portion being movable relative to the fixed portion according to the force provided by the biasing member to provide a variable flow restriction,wherein the nozzle head is connectable to a riser with the filter and pressure regulator protruding into the riser; and a low friction seal positioned between the movable portion and a nozzle assembly housing operable to prevent leakage from upstream of the nozzle spray outlet and the reference pressure area in the nozzle assembly as the movable portion moves relative to the fixed portion.