US Patent No. 9,222,593

SOLENOID ACTUATED PILOT VALVE FOR IRRIGATION SYSTEM VALVE


Patent No. 9,222,593
Issue Date December 29, 2015
Title Solenoid Actuated Pilot Valve For Irrigation System Valve
Inventorship Michael L. Clark, San Marcos, CA (US)
Assignee Hunter Industries, Inc., San Marcos, CA (US)

Claim of US Patent No. 9,222,593

1. A solenoid actuated valve, comprising:
a valve housing defining a valve chamber having a first port, a second port, and a third port, wherein the third port communicates
with the valve chamber;

a solenoid positioned at least partially within the valve housing and including a reciprocable shaft moveable between a first
position when the solenoid is energized and a second position when the solenoid is not energized;

a drive shaft positioned within the valve housing, the drive shaft moved by an axial force of the reciprocable shaft only
when the reciprocable shaft is moved to the second position;

a head connected to the drive shaft and not permanently connected to the reciprocable shaft, the head movable within the valve
chamber by the drive shaft and including a first seal for sealing a first end of the first port when the solenoid is energized
and a second seal for sealing a first end of the second port when the solenoid is not energized; and

a biasing element configured to bias the head to seal the first end of the second port, wherein the valve head is positioned
within a pilot valve chamber and wherein the biasing element is positioned outside of and fluidly separate from the pilot
valve chamber;

wherein the drive shaft pulls the head toward the reciprocable shaft when the solenoid is energized.