Replacing and Installing Sprinkler Valves: A Comprehensive Guide

Single Valve Assembly Example

This image shows a complete single valve assembly with unions for easy maintenance.

Required Parts for Each Valve

1. 1 tee or elbow slip by thread 1"
2. 2 close nipples 1"
3. 1 threaded union 1"
4. 1 automatic sprinkler valve 1"
5. 1 slip union 1"
6. 1 toe nipple (threaded on one side for gluing)
7. Teflon tape

Parts for Drip Valves and Filters

1. 1 tee or elbow slip by thread 1"
2. 2 close nipples 1"
3. 2 threaded unions 1"
4. 1 automatic sprinkler drip valve 1", with drip basket filter
5. Teflon tape

Main Line Connection Fittings

These slip by thread fittings connect the valve to the main line. For replacements, these may already be installed. For upgrades, you'll need a Tee or Elbow for each new valve.

Close Nipple Installation

This 1" close nipple keeps the manifold compact. Use Teflon tape or pipe dope on all manifold fittings for a secure seal.

First Union Installation

Thread on the first union. For 1" pipe, tighten just over hand-tight. If unsure, start with hand-tight and check for leaks when pressurizing the main line.

Second Close Nipple Installation

Thread in another close nipple to continue the assembly.

Valve Installation

Thread on the valve, ensuring correct direction. Look for the directional arrow on the valve body. The solenoid should be on the lateral/non-pressure side.

Toe Nipple Installation

Thread in a toe nipple and cut to size. Keep it compact for better accessibility.

Slip Union Installation

Glue on the slip union to complete the single valve assembly.

Completed Valve Assembly

Congratulations on assembling your first valve! Repeat these steps for additional valves as needed.

Main Line Preparation

Prepare the main line for the first valve installation. This example shows an upgrade where old valves are being relocated.

First Valve Assembly Installation

Glue on the first valve assembly following proper gluing procedures. For detailed gluing information, refer to our gluing basics guide.

Inter-Valve Connection

Cut a short piece of pipe to glue between additional valves in the manifold.

Adding More Valves

Continue adding valves to the manifold using the same method as the first valve.

Completing the Manifold

The last valve may require an elbow instead of a tee. Add as many valves as needed, but remember that typically only 4 valves fit in each sprinkler box.

Lateral Connections

Finally, glue in the lateral connections to each corresponding valve to complete the installation.

Valve Box Installation

You may need to cut your valve box to set it level with the surrounding landscape.

Wiring and Backfilling

The final steps involve wiring the valves and backfilling the box. Proper wiring is crucial for system functionality.

Valve Wiring Guide

Valve wiring can be simple, but improper installation can cause issues. Use approved wire designed for sprinkler systems. Each wire strand is color-coded for easier installation.

1. Choose a color for your common wire (typically white, but shown as blue in our example for clarity).
2. Connect the common wire to each valve.
3. Use a different color wire for each individual valve.
4. Maintain a consistent color code to simplify clock/timer installation.

Wiring Color Code Example

In this example, the installer used black as the common wire. Here's a sample color code for valve wiring:

Common Wire: White

1. Red
2. Yellow
3. Blue
4. Green
5. Orange
6. Purple
7. Gray
8. Black
9. Pink

Note: Your wire colors may differ, but maintaining a consistent system is key.