How to Replace a Sprinkler Valve and When You May Need To

Sprinkler systems are a convenient way to keep your lawn and garden green and healthy, but they rely on a complex network of components to function properly. One of the critical parts of a sprinkler system is the sprinkler valve, and when it’s faulty, there are a number of issues that may arise. We’ll explore how to tell if there’s a problem and how to replace a sprinkler valve or fix it. Let's dive into the world of sprinklers and see how you can keep your irrigation system running smoothly.

Why Replace a Sprinkler Valve?

The primary function of a sprinkler valve is to regulate the distribution of water to different zones of your lawn or garden. This process ensures that each part of your landscape receives the appropriate amount of water.

Like any mechanical component, however, sprinkler valves can wear out or become damaged over time. Knowing when, why, and how to replace a sprinkler valve is essential to maintaining an effective irrigation system. Here are some compelling reasons to consider replacing a faulty sprinkler valve:

Reduced Efficiency and Water Waste

As sprinkler valves age or develop issues, they may not open and close as efficiently as they once did. This can result in uneven watering and potentially leave certain areas of your lawn parched or overwatered. This can also lead to water waste and higher water bills.

Poor Coverage

If you notice that specific areas of your lawn or garden aren't receiving enough water, it could be due to a valve problem. Insufficient coverage can harm your landscaping and compromise the health of your plants.

Risk of Damage

A damaged or corroded sprinkler valve can cause leaks in your irrigation system. These leaks can damage your lawn, create muddy areas, and even affect the foundation of your home. Regular maintenance and timely replacement of faulty components, including sprinkler valves, can extend the overall life span of your sprinkler system. 

How Much Does It Cost to Replace a Sprinkler Valve?

The cost of sprinkler repairs is an important factor in your budget, and the cost of replacing a sprinkler valve can vary depending on several factors. These factors include the type of valve, the complexity of the job, and whether you choose to do it yourself or hire a professional.

When it comes to DIY replacement, you’ll only have to pay for sprinkler valve parts, which can range between $13 and $150, depending on the part. On the other hand, hiring a professional sprinkler company to perform the replacement costs between $70 and $350, depending on the valve brand and the complexity of the job.

Signs You Need to Replace a Sprinkler Valve

Identifying the signs of a faulty sprinkler valve is crucial to address issues promptly. Recognizing these symptoms can save you money, prevent water waste, and keep your landscape in top shape. Here are some common signs that indicate it's time to replace a sprinkler valve:

• Irregular watering throughout the system

• Water not turning on or off

• Water leaks around the valve box

• Reduced water pressure

• Audible clicking or humming coming from valve

How to Replace a Sprinkler Valve

If you've identified any of the signs above and determined that your sprinkler valve needs replacement, you can choose to tackle the task yourself or hire a professional. If you're confident in your DIY skills, here's a step-by-step guide to help you repair or replace a sprinkler valve.

Check for Clogs and Clear Them

Photo: citr1965 / iStock / Getty Images Plus / Getty Images

The problem with your sprinkler valve may be as simple as a clog that has occurred due to stuck dirt or debris. Check your sprinkler valve for clogs and clear them out to see if this solves the problem with your faulty valve. 

1. Turn off the water supply: Locate the main water shut-off valve for your sprinkler system and turn it off. This will prevent water from flowing while you work on the valve.

2. Identify and open the valve box: Locate the valve box in your yard that contains the problematic valve. It's usually a green or black plastic box buried underground. Carefully lift the lid of the valve box, being cautious not to damage any wires or pipes inside.

3. Inspect for clogs: Examine the valve and its components for any visible clogs, debris, or damage. Remove any obstructions using a small brush or compressed air.

4. Check the diaphragm: If the diaphragm inside the valve appears damaged or worn, it's best to replace the entire valve. Diaphragm replacement is a more advanced repair and may require specific tools and expertise.

5. Clean the valve box: Before closing the valve box, ensure it's clean and free of dirt or debris. This will help protect your new valve from contaminants.

Repair the Valve With Replacement Parts

Before replacing the entire sprinkler valve, check if it can be fixed with replacement parts by conducting a thorough inspection. Start by turning off the main water supply to the sprinkler system and carefully disassembling the valve. Look for visible damage or wear on components such as the solenoid or valve seals. 

If you find specific issues like a broken solenoid or damaged seals, these parts can often be replaced relatively easily. Here’s what you can do to replace broken valve parts:

1. Purchase replacement parts: If you've determined that the valve can be repaired, purchase the necessary replacement parts. 

2. Shut off the water: Turn off the main water supply to your sprinkler system to prevent any accidental leaks or water flow during the repair.

3. Remove the valve: Carefully disconnect the valve from the surrounding pipes. You may need to cut PVC pipes or unscrew fittings, depending on the type of valve and plumbing configuration. If you’re uncomfortable with this task, reach out to a plumber near you.

4. Install the new components: Follow the manufacturer's instructions to install the replacement parts. Ensure all connections are secure and watertight.

5. Test the valve: Turn the main water supply back on and test the repaired valve to ensure it functions correctly. Check for leaks and irregularities.

Replace the Entire Valve

Photo: kalpis / Adobe Stock

Some issues may require an entire valve replacement. For example, if the valve body itself is cracked, severely corroded, or has other irreparable damage, it's usually best to opt for a complete replacement rather than attempting repairs. Here’s how to replace the whole valve:

1. Purchase a new valve: If the valve is beyond repair or you prefer to replace it entirely, purchase a new valve of the same type and size as the old one.

2. Turn off the water: As with any plumbing work, turn off the main water supply to your sprinkler system before beginning the replacement.

3. Remove the old valve: Disconnect the old valve from the pipes and remove it from the valve box. You may need to cut pipes or unscrew fittings as needed.

4. Install the new valve: Follow the manufacturer's instructions to install the new valve. Ensure that all connections are secure and properly sealed.

5. Test the new valve: Turn the main water supply back on and test the new valve to ensure it opens and closes correctly. Look for leaks and make any necessary adjustments.

6. Cover and secure the valve box: Once the replacement valve is functioning correctly, carefully lower the valve box lid back into place, ensuring it's level with the ground. Secure it in position.

Ways to Prevent Faulty Sprinkler Valves

Preventing faulty sprinkler valves is essential for maintaining a healthy and efficient irrigation system. Here are some tips to help you avoid valve issues in the first place:

• Periodically inspect your sprinkler system for signs of wear, damage, or leaks. Catching issues early can prevent them from worsening.

• Before the freezing winter months, make sure to properly winterize your sprinkler system. This includes draining water from the pipes to prevent freezing and damage.

• Overwatering can lead to valve problems. Ensure that your sprinkler system is programmed to water your landscape appropriately based on plant needs and weather conditions.

• Some valves have filters or screens that can become clogged with debris. Clean or replace these components as needed to maintain proper water flow.

• Consider scheduling routine maintenance with a professional sprinkler service. They can identify and address issues before they become major problems.

DIY vs. Hiring a Pro

Choosing whether to replace a sprinkler valve yourself or hire a professional is an important decision with several factors to consider. If you opt for a DIY approach, you can potentially save money on labor costs, but you should definitely have some basic plumbing and DIY skills if you think you want to go this route. 

On the other hand, hiring a local sprinkler company offers the advantage of expertise, which ensures that the job is done correctly. You can also save time and gain peace of mind that the job is done correctly. 

Ultimately, your decision should be based on your comfort level with DIY projects, your familiarity with sprinkler systems, and the complexity of the valve replacement.