A sprinkler control valve is an integral part of any automated irrigation system, The valve controls the flow of water to any given zone within the system and is opened electrically by the central irrigation control unit. In modern irrigation systems, the valve is connected to piping by a manifold, a series of threaded connectors specifically designed to hold the valves for an entire irrigation system. Occasionally, valves will become defective and will need to be replaced. Manifolds do not require cutting the pipe to replace a valve, so this is a relatively easy procedure.
Shut off the main water supply at the cut-off valve for the irrigation system. Cut off the power to the irrigation controller by turning off the circuit breaker to the unit.
Locate the defective sprinkler control valve at the manifold, the cluster of valves in the irrigation system.
Remove the grease cap; the protective cover for the wiring connection at the valve, and wipe the wires clean with a paper towel or rag. Remove the electrical tape from the wiring and disconnect the wires
Loosen the threaded connectors that connect the end of each valve in place in the manifold and remove the defective sprinkler controller valve. Most valves can be loosened by hand; however, you may need to use a pipe wrench to loosen the connection first.
Insert the new sprinkler control valve and tighten the threaded connectors. Tighten the connections with the wrench to prevent any leaks. However, do not over-tighten. Wire the valve and cover the wiring with electrical tape. Place the wiring into a new grease cap to protect it from the elements.
Turn the water back on. Turn the irrigation controller back on and activate the sprinkler control valve from the controller to ensure the installation is functioning properly.