Fluid handling – Ambient condition change responsive – For controlling soil irrigation
Reexamination Certificate
2006-06-01
2008-12-30
Rivell, John (Department: 3753)
Fluid handling
Ambient condition change responsive
For controlling soil irrigation
C137S614160, C137S614210, C251S212000, C239S064000
Reexamination Certificate
active
07469707
ABSTRACT:
An irrigation control valve has two movable members that can independently or in combination block the flow of water in a conduit, or be fully retracted of at some point in-between. A moisture sensitive element is arranged to be placed in contact with the soil and expands or retracts dependent on the moisture within soil adjacent the moisture sensitive element. The moisture sensitive element is connected or coupled to a moisture controlled member. Dependent on the moisture of the soil adjacent the moisture sensitive element, the moisture controlled member is moved further into the conduit with increasing moisture in the soil. The moisture controlled member and an electronically controlled member are located adjacent each other at the conduit. The electronically controlled member determines how far the moisture controlled member needs to move in order to fully block the flow of water in the conduit. An electronic controller is operable to determine the achieved level of moisture in the soil, by means of the electronically controlled actuator and the electronically controlled member.
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Anderson Noel W.
Stelford Mark W.
Deere & Company
Rivell John
Schneider Craig M
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