Repairing Guides

how to repair a backflow preventer

by Prof. Christine Gleason Published 2 years ago Updated 1 year ago
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Repair a Leaking Backflow Preventer.

  • Step 1 – Look for the Test Valve. You need to look for the test cock valve and the shut-off valve located in your backflow prevention valve. Both of ...
  • Step 2 – Examine the Opened Test Valve.
  • Step 3 – Inspect the Water Pressure.
  • Step 4 – Let a Professional Assist You.

Full Answer

How much does it cost to install sewer backflow preventer?

These multi-valve backflow preventers are installed on a main water and sewer pipe. For this scope of backflow prevention cost, homeowners are usually looking at a price range between $100 and $600. Normally, the labor cost for installing this type of backflow preventer is anywhere between $25 and $250.

How do you check a leaking backflow preventer?

The better-known Backflow Preventer Test Kits are:

  • Model TK-7
  • Model TK-9A
  • Model TK-99D Delta Lite

Are backflow preventers the same as vacuum breakers?

Approved types of Backflow Prevention Assemblies Most backflow preventers fall into one of three classes: the vacuum breaker, the double- check valve, or the reduced-pressure principle valve. Both prevent backflow due to superior pressure, or back pressure on the downstream side of a system, which will overcome the pressure on the supply side.

What is the purpose of a back flow preventer?

  • Model No: FBLF825Y1
  • Finish: Bronze
  • Stock: Available
  • Retail Price: $858.50
  • Our Price: $544.88

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Can you fix a backflow?

0:004:01How to fix a leaking backflow preventer - YouTubeYouTubeStart of suggested clipEnd of suggested clipThese are called check valves you can see there's number one that's the one the water hits first andMoreThese are called check valves you can see there's number one that's the one the water hits first and then the one after that is number two and inside here is a spring. And a plunger.

How do you take apart a backflow preventer?

1:124:13719 12'' 2'' Backflow Preventer Repair - YouTubeYouTubeStart of suggested clipEnd of suggested clipRemove the check cover along with a cover o-ring the spring. The disc holder assembly. And the seatMoreRemove the check cover along with a cover o-ring the spring. The disc holder assembly. And the seat each check component should be inspected to ensure the correct operation of the unit.

How do I know if my backflow preventer is bad?

Water Flow Is Slow One of the simplest signs that your backflow preventer is bad stems from the flow of water. You may not know until it's too late—like if the fire sprinklers go off for the first time in a while.

Can you replace a valve on a backflow preventer?

0:0011:13FAST and EASY Backflow preventer repair. Ball Valve replacement.YouTubeStart of suggested clipEnd of suggested clipYou can buy this as a single unit. But it's about seventy dollars or so where I was able to find theMoreYou can buy this as a single unit. But it's about seventy dollars or so where I was able to find the exact ball valve I needed on Amazon for about fourteen. So big cost savings there.

What causes a backflow preventer to fail?

Backflow prevention assemblies are designed to provide decades of protection. There are many regional conditions that can shorten the working life of a backflow preventer. Conditions such as excessive pressure, water quality, temperature or turbidity can all cause the assembly to deteriorate in its performance.

How long does a backflow preventer last?

The backflow devices are considered “non-testable” and the only required maintenance is rebuild or replacement of the device once every five years.

How often should a backflow preventer be replaced?

every five yearsThey must not only be tested annually, but rebuilt every five years. If not, there could be serious harmful backflow. If you discover anything amiss in the testing of the backflow preventer, it is a good idea to handle it right then.

How do I replace a backflow device?

3:206:59How to replace a lawn sprinkler backflow preventer - YouTubeYouTubeStart of suggested clipEnd of suggested clipIf there's ever a problem with the bottom end of the assembly. I can just undo this Union and takeMoreIf there's ever a problem with the bottom end of the assembly. I can just undo this Union and take the assembly out and the other reason is it helps me level assembly if it's out of level.

How do you remove an anti siphon valve?

0:502:48How to Fix Anti Siphon Valve on Faucet - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo that you don't crack it. Once you remove that any safety valve just put it to the side andMoreSo that you don't crack it. Once you remove that any safety valve just put it to the side and hopefully with any luck the a TESOL anti-siphon valve itself is loose and you just unscrew it.

How do I remove the backflow from my outside faucet?

Step by Step InstructionsLocate the Set Screw. Look at the base of the spigot where the valve connects and check for a small set screw. ... Try to remove the valve with a wrench. In some cases it will be possible to remove the valve with a little elbow grease and a wrench. ... Use a Drill Bit. ... Attach New Hose Bib.

Why put a backflow preventer in an enclosure?

Placing your backflow preventer in an enclosure also helps to minimize flood risks.

How long does a backflow prevention assembly last?

With proper maintenance and annual testing, backflow prevention assemblies can last for many years. But mechanical backflow prevention assemblies have internal seals, springs, and moving parts that are subject to clogging, wear or fatigue.

Can you repair a larger valve?

Cleary says even if you can repair a larger valve, it may not mean that you should repair it. “You may have a 35-year-old valve with its epoxy coating flaking off, and even though it may only cost a few hundred dollars to repair, you may be better off installing a more modern valve that will be less expensive to maintain over the years.” Cleary says. “Today’s backflow preventers are shorter, they’re lighter, there are fewer parts and they’re easier to maintain.”

Should I replace backflow preventer valves?

Cleary says if you have a smaller valve whose checks are brittle and ready to crack, you should consider replacing it. “If I have to replace two checks, along with the rest of the rubber parts and everything else, it may be less expensive to replace the valves.”

Do backflow preventers work in an above ground enclosure?

Backflow preventers in an outdoor, above-ground enclosure are easier to work on. “More valves are going in enclosures, more valves are going above ground, and to be honest, that’s where they belong,” Cleary says. A properly designed enclosure will have removable panels and a removable roof to make it much easier to test, ...

Why does my backflow preventer leak?

There is no one reason for backflow preventer leaks. For instance, it may freeze during the winter and be damaged when it’s turned on afterwards. Another cause for leaking might be damage to certain parts, which can happen no matter how old the device is. All that said, how can leaks be fixed?

Why is water pressure maintained?

Water is maintained at a certain pressure to allow water to flow from the tap, shower and other fixtures. However, this pressure may fail when a water main bursts, a pipe freezes or an unexpected high demand on the water system is experienced.

Can you check a check valve yourself?

First, you can check whether there is debris in the first or second check valve.

Does Watts make backflow preventers?

Watts is one of those companies that make backflow preventers, and while they have good quality products, there are occasions when issues like leaks affect their products. So what do you do when your own device runs into trouble?

Can you fix a backflow preventer?

For one, you can try the backflow preventer repair kit. Some issues are easily solved with the kit. Then again, there are cases when the problem is too complex that you will need to call in a professional for a proper remedy.

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Step 1 – Look For The Test Valve

  • You need to look for the test cock valve and the shut-off valve located in your backflow prevention valve. Both of these items are important in testing the valve. Location of these items varies depending on the product type and the manufacturer. Carefully examine your backflow prevention valve so you can easily locate the test cocks.
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Step 2 – Examine The Opened Test Valve

  • Once you have successfully located the test cock valves, proceed to opening it using the wrench. Turn it a 1/4 inch or at a 90-degree angle from the start. Test the flow of the water by turning on the water and let a few water drip through it. By this time, the water may travel backwards through the system. Here you will have to check the relief valve if it is tightly secured lest the water come…
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Step 3 – Inspect The Water Pressure

  • Use the pressure gauge (either purchased or already attached to the valve) to examine the existing water pressure within the valve. Your valve is normal if the pressure stays even if you opened the test cock. Meanwhile, if the test cock is turned on yet the pressure you read in the gauge is increasing then you must replace the valve lest it causes greater damage. Do inspect th…
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Step 4 – Let A Professional Assist You

  • There are communities that do not allow you to conduct your own testing of the valve, so you find out before you start. Consult a professional to assist you or let the professional do it for you instead. The advantage of seeking professional help is that they are able to do this process more efficiently, identify valve related problems that you may have missed, and test all the valves in th…
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