초록 ▼

An irrigation system for controlling the operation of a number of control valves each of which controls the flow of water in a corresponding branch pipe leading from a common supply pipe. The system comprises a pair of control lines which extend along the supply pipe and branch pipes to carry a cont

An irrigation system for controlling the operation of a number of control valves each of which controls the flow of water in a corresponding branch pipe leading from a common supply pipe. The system comprises a pair of control lines which extend along the supply pipe and branch pipes to carry a control signal to operate a control unit which operates a corresponding control valve using a low voltage power supply. The control signal is coded by a data generator according to predetermined conditions and is decoded by each of the control units, the coded signal being received at each control unit, and the specified control unit operating only.

대표청구항 ▼

An irrigation system for controlling the operation of a plurality of control valves each of which controls the flow of water in a corresponding branch pipe leading from a common supply pipe, characterised by a pair of low voltage power supply lines extending along said supply pipe, a pair of control

An irrigation system for controlling the operation of a plurality of control valves each of which controls the flow of water in a corresponding branch pipe leading from a common supply pipe, characterised by a pair of low voltage power supply lines extending along said supply pipe, a pair of control lines also extending along said supply pipe, a control data generator connected to said control lines, and a control unit corresponding to each of said control valves and located adjacent thereto, said control units being connected to the corresponding control valve, to said low voltage power supply, and to said control lines, and including decoding means to detect data transmitted over said control lines by said data generator which identifies a predetermined one of said control units and switch means activatable by said decoding means to connect or disconnect said corresponding control valve and said power supply to operate said corresponding control valve.