Patent ID: 8746593

Claim:
An irrigation system comprising: a water supply line; a plurality of branch lines connected to the supply line; a valve in at least one of the branch lines for controlling the flow of water from the supply line to the branch line; a liquid chemical dispenser in fluid communication with the supply line, the dispenser comprising: a body having a first passage for the flow of irrigation water; a water inlet port on a first side of the body in fluid communication with the first passage, the inlet port having a first diameter; a water discharge port on a second side of the body in fluid communication with the first passage, the discharge port having a diameter substantially equal to the first diameter; an aspirator comprising a second passage substantially orthogonal to and in fluid communication with the first passage; a removable chemical container for containing a liquid chemical for mixing with irrigation water flowing through the body connected to the body and in fluid communication with the second passage; and, a valve in the chemical container comprising an elastomeric disk having a central portion of reduced thickness with a slit therein for regulating the flow of liquid chemical from the container into the second passage and, an outer, peripheral portion which acts as a one-way flap valve responsive to sub-ambient pressure within the container for admitting air into the container.