Tensiometer irrigation valve

Details Tensiometer irrigation valve Tensiometer irrigation valve

A - Human Necessities

01

G

A01G 25/16 (2006.01) G05D 7/00 (2006.01)

Patent

CA 2119933

2119933 9305644 PCTABS00021 A flow controller device includes a valve assembly (2) connected with a tensiometer (1) to provide automatic control of flow of water for irrigation, including variable control of the rate of flow according to the matric tension of the soil for water. The tensiometer (1) is made of a porous cup (11) and a connecting tube (12) to measure this tension of the soil, which depends on the moisture and type of the soil. The valve assembly is formed of a piston (24) moving in a cylinder (22), to move a rod (25) connected to the piston (24). A cavity on the piston end of the cylinder connects with the tensiometer (1), and at the far end of the rod a flow valve (2) is formed. As the soil dries, water moves out of the tensiometer's porous cup (11) into the soil, reducing the pressure in the tensiometer (1) and cylinder cavity, thereby shifting the piston (24) to begin or increase the flow for irrigation. As soil moisture increases, water moves back into the tensiometer (1), increasing its pressure, thereby moving the piston (24) to close the flow valve.

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