US Patent No. 9,253,950

LOW FLOW EMITTER WITH EXIT PORT CLOSURE MECHANISM FOR SUBSURFACE IRRIGATION


Patent No. 9,253,950
Issue Date February 09, 2016 
Title Low Flow Emitter With Exit Port Closure Mechanism For Subsurface Irrigation
Inventorship Michael L. Clark, San Marcos, CA (US)
Daniel E. Hunter, Vista, CA (US)
Assignee Hunter Industries, Inc., San Marcos, CA (US)

Claim of US Patent No. 9,253,950

1. A drip emitter for landscape irrigation, comprising:
a valve chamber defining a hollow interior, an entry port, at least one exit port, and a tortuous path water flow channel
that limits the flow of water from the entry port to the at least one exit port;

a flexible diaphragm mounted in the hollow interior of the valve chamber for movement in response to pressurized water being
supplied to the hollow interior through the entry port;

a closure member positioned between the tortuous path water flow channel and the at least one exit port, the closure member
moved by the flexible diaphragm to open the at least one exit port when pressurized water enters the hollow interior to allow
water to be discharged through the at least one exit port; and

a spring that moves the closure member to close the at least one exit port when the supply of pressurized water is shut OFF;
wherein the at least one exit port defines an interface between the hollow interior of the valve chamber and an environment
surrounding the drip emitter.