วิธีเตรียมระบบรดน้ำใต้ดิน Orbit ของคุณสำหรับฤดูหนาว: คำแนะนำทีละขั้นตอน

Winter in colder climates can be brutal on your underground irrigation system. If you leave water sitting in the pipes, valves, and sprinklers when the temperatures drop below freezing, you risk cracked fittings, burst pipes, and damaged sprinkler heads. Winterizing your Orbit system isn't just smart—it's essential for avoiding costly repairs come spring.

Fortunately, with the right tools and a bit of know-how, you can protect your investment in about an hour. In this guide, we'll cover the two main methods: manual draining and compressed air blowout. We'll also highlight a few Orbit products that make the job easier and more reliable. Whether you have a simple hose-end system or a full underground network, these steps will keep your irrigation ready for the next growing season.

Why Winterizing Your Orbit Underground System Matters

Water expands as it freezes, creating immense pressure inside pipes and fittings. Even small amounts of trapped water can crack PVC pipes, split valve bodies, or damage sprinkler heads. Repairing a buried pipe often requires digging up your lawn, and a frozen valve can take hours to replace. The cost of winterizing is a fraction of what you'd pay for spring repairs.

Orbit underground systems are built to last, but they aren't freeze-proof. Components like the plastic flush head sprinkler with plastic nozzle and cutoff risers are especially vulnerable if water freezes inside them. Taking 30 minutes to drain and blow out the lines ensures that every drop of water is removed, protecting your system for years.

• Prevents cracked PVC pipes and broken fittings
• Saves money on emergency repairs and replacements
• Prolongs the life of valves, risers, and sprinkler heads

Step 1: Shut Off the Water and Drain the Main Line

Start by closing the main water supply to your irrigation system—typically a valve inside your home or at the backflow preventer. Next, open the manual drain valve (if your system has one) at the lowest point of the main line. Let gravity do the work: water will flow out until the line is empty. For systems without a built-in drain, you can install one using a 1/2" Slip x 3/4" FHT PVC Fitting and a short piece of pipe to create a convenient drain point.

After the main line is drained, open all zone valves manually (or via the controller) to release pressure and let any remaining water trickle out from the lateral lines. Leave the valves open for a few minutes. If your system has auto-drain valves at low points, those will also release water. This step removes the bulk of the water, making the blowout process more effective.

• Always turn off the water supply before draining
• If your system lacks a drain valve, add one using Orbit PVC fittings

Step 2: Perform a Compressed Air Blowout

For complete protection, especially in regions with hard freezes, use an air compressor to blow out the lines. Attach a blowout adapter to the system—usually at the test port on the backflow preventer or at a hose bib near the main line. Connect your compressor and set the regulator to no more than 50 PSI for PVC pipes (80 PSI for polyethylene). If your compressor doesn't have a built-in regulator, you can add a 25 PSI Pressure Regulator at the connection point to stay safe.

Open one zone at a time on your controller, then turn on the compressor. Let air flow until mist turns to pure air—usually 2–3 minutes per zone. Do not run all zones at once; you need enough airflow to push water out. After each zone, close that valve before moving to the next. Once all zones are done, close the main valve and leave all zone valves open slightly to prevent pressure buildup.

• Never exceed 50 PSI on PVC—higher pressure can damage pipes
• Run each zone individually for best results

Step 3: Protect Above-Ground Components

Don't forget the parts you can see: backflow preventers, valves, and the sprinkler heads themselves. Remove any drain caps from valve boxes and let them air dry. For backflow preventers, wrap them with insulation tape or a foam cover if they're exposed. If you have pop-up sprinklers, retract them fully and make sure no water is trapped inside the body. Orbit's plastic flush head sprinkler with plastic nozzle is durable, but it can still crack if water freezes inside.

For risers and fittings like the 1/2" x 6" Cut-Off Riser 10-pk, check that no water is pooled inside after blowout. If you notice any moisture, manually cycle the valve again or use a shop vac to pull it out. Finally, store any removable parts (like nozzles or quick-couplers) in a dry garage or shed. Also hoses connected to the system should be detached and drained. A retractable hose reel like the 50ft x 5/8 Auto Retractable Hose Reel with Wall Mount can be left on the wall but make sure the hose is empty.

• Insulate backflow preventers and exposed valves
• Remove and store nozzles and quick-couplers if possible

Common Winterizing Mistakes to Avoid

One frequent error is relying solely on manual drains without a blowout. In many systems, small pockets of water remain trapped in low spots or around fittings. Another mistake is using too much air pressure—over 50 PSI can blow apart PVC joints. Also, don't forget to winterize the controller: turn it off or set a rain/freeze sensor to inactive mode. Finally, avoid leaving zone valves open for weeks—they can accumulate debris. Instead, open them only during the blowout and then close them partially.

Finally, consider installing a pressure regulator on your compressor line if you don't have one. The 25 PSI Pressure Regulators are an ideal accessory to prevent over-pressurization during blowout. This simple addition gives you peace of mind and protects your system's internal seals and diaphragms from damage.

• Don't skip the blowout—draining alone is rarely enough
• Install a pressure regulator to keep PSI safe

Winterizing your Orbit underground irrigation system doesn't have to be a chore. With the right steps and a few reliable products—like a pressure regulator for safe blowouts or PVC fittings for adding drains—you can keep your system freeze-free all winter. Ready to get started? Check out the 25 PSI Pressure Regulators to add safe air control to your blowout kit.