Patent ID: 9521813
Filing Date: 2016-12-20
CPC Classification: A01G,E02B

Claim Text:
1. A subsurface emitter comprising: a body having a centerline CL, a body interior, a top and a bottom opposite to the top; an inlet into the body interior, the inlet configured to connect to a watering system to place the body interior in fluid communication with the watering system; a nozzle attached to the top of the body and having a nozzle interior and a nozzle ceiling defining a closed end of the nozzle interior opposite to the body; at least one port in the nozzle providing fluid communication between the nozzle interior and a subsurface area adjacent to the nozzle; a piston residing in the nozzle interior, a cylindrical circumferential surface portion of the piston slides against an interior wall of the nozzle; a spring residing in compression between the nozzle ceiling and the piston biasing the piston towards the body; a closed piston position wherein the cylindrical circumferential surface portion of the piston covers the port and restricts the fluid communication through the port between the subsurface area and the nozzle interior; and an open piston position wherein the cylindrical circumferential surface portion of the piston no longer covers the port and fluid communication is open between the body interior the subsurface area adjacent to the nozzle.