PULSED SPRINKLER UNIT Russian patent published in 2007 - IPC A01G25/09 

FIELD: mechanized irrigation of farm crops by sprinkling process, in particular, equipment used in sprinkling irrigation systems.

SUBSTANCE: pulsed sprinkler unit has valve with seat and piston. Cavity between seat and piston is communicating with nozzle cavity and cavity formed under valve is communicating with air-and-water tank and pressure pipeline. Locking device is equipped with auxiliary piston spring-loaded relative to valve piston and provided with large-sized and small-sized cylinders and divided by means of perforated partition. Auxiliary piston is positioned for axial displacement within casing cylinder and abuts with small-sized cylinder end against seat. Valve and piston are positioned within cavities of small-sized and large-sized cylinders of auxiliary piston, respectively. Distance between partition of small-sized cylinder and valve is greater than distance between right-hand ends of valve piston and auxiliary piston. Outer diameter of small-sized cylinder is smaller than inner diameter of large-sized cylinder of auxiliary piston.

EFFECT: enhanced reliability in operation, reduced consumption of power owing to providing of working capacity within wide range of flow rates and pressures and due to eliminating influence of frictional force of sealing means upon working capacity of locking device in its opening phase.

3 cl, 2 dwg