Rain Bird Anti-Siphon Valve, ASVF
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- เผยแพร่เมื่อ 24 พ.ย. 2024
- Take a look at the Rain Bird Anti-Siphon Valve.
Available Here: sprinklersuppl...
Anti-Siphon valves are installed above ground and will prevent backflow if properly installed. Anti-Siphon valves should always be installed at least 6" above the highest head on the valve line, and should never have another valve installed further down the line from the main valve. Rain Bird Anti-Siphon valves also feature our patented vacuum breaker-available for automatic or manual applications. All Rain Bird Anti-Siphon valves work with any standard sprinkler timer.
What causes the anti siphon valve to back flow?
1. **Backsiphonage:** This occurs when there is a sudden drop in water pressure in the supply line, such as when a water main breaks or a large amount of water is being used elsewhere in the system/house. This drop in pressure can create a vacuum or siphon effect, potentially pulling contaminated water from the irrigation system back into the clean water supply. The backflow device prevents this by allowing air into the system, breaking the siphon.
2. **Backpressure:** This happens when the pressure in the irrigation system zone becomes higher than the pressure in the clean water supply, often due to a pump or elevation changes in the irrigation system.
Typically, these valves are used/required instead of a Backflow Prevention device installed on the mainline.
Thank you for your video! On one of my sprinkler lines, water flows out of the air gap area on the A.S. valve once the watering cycle is complete. Water runs out for approximately 8 seconds, almost like it is draining the line. The other 3 valves do not do this. Is this normal/common? Thanks again!
Would love to have a bit more information, and if you haven’t solved this, let me know. Sounds like some common back pressure for quick closing valves, perhaps you have high-pressure?
Water pressure from the water supply CLOSES the anti-siphon valve. When there is no water pressure, it opens the valve to allow back flow to run through it.
Good to know
The only difference this 3/4” and the 1” valve is the pipe in and out. All the parts are exactly the same
Thanks!
Thanks a million
My pleasure! Feel free to hit us up if you ever have questions.
Hi Andy, thanks for the video. I have two rain birds installed. One works fine but on the other one when I turn the solenoid to the left to turn it on nothing happens. Any ideas what the problem might be?
Under the solenoid there is a small port/hole and my best guess is that a small piece of debris is lodged in there it needs to be cleaned out.
Try removing the solenoid and clean it out using a small needle. When you remove the solenoid, it may cause water to flush through the port, and it will clean itself out.
If that doesn’t work, turn the water off at the source, and then remove the top of the valve, and clean it out from the inside.
The way the solenoid works, is there is a pin inside of it that lifts up, to allow water to flow through the port, and actuators the valve.
By turning the solenoid with your hand, you are essentially lifting the pin just a bit, and because yours will not turn on, there must be debris in there.
@@Andy_Humphrey thank you Andy. I will try that. Your videos are great. Very detailed, precise and professional.
@@temomoreno2018 thanks! Please report back with what you discover, I'm curious, and it's helpful to provide better feedback in the future.
@@temomoreno2018 just for fun, I made this TH-cam Short: th-cam.com/users/shortsqIidRqeHZIs?feature=share
Hi Andy, I followed your instructions and it’s now working great. Thank you so much for your help. I’m glad I found your videos. They are very informative. Thank you so much for helping me solve the problem.
So, if I have a slow leak I need to look at opening the valve and replacing the diaphragm and checking for debris?
That sounds correct. A slow leak is generally caused by the diaphragm not seating all the way. it could be debris, or could be a worn out, diaphragm, or mineral deposit buildup, etc. Also remove the solenoid and check for debris.
Thank you for the very informative video. I have 2/8 rainbird valves that seem to spill more then usual amounts of water thru the anti backflow at both start up and shut down, creating a small pond of water daily. They operate just fine, but seems to loose a lot of water at activation and shutdown. These valves are probably 10 years old, any suggestions as to why? Thank you..
Hi Mark. I’d start by taking the 2 valves apart, check for debris or gunk build-up, and see if that helps. Sound like something s preventing the seals from closing until the pressure builds up.
Thank you..
What is the difference between the DAS and ASVF valve? They look identical.
Great question and I would also love to know. Perhaps someone else will comment here and let us know. I looked through the literature and couldn't find an answer.
Thanks for the great review! What do you think the problem could be if nothing can stop the sprinklers from going off? Turning it off manually doesn't do anything either. Thanks in advance!
Hi Paul - this could be due to a couple of different reason. It is important to first determine if it is electrical issue, or a hydraulic issue.
Is this happening with one zone, or all zones?
To help determine if it is an electrical issue, try unplugging your controller and see if everything turns off. If your timer is hardwired, flip off the breaker.
If it is an electrical problem, everything should now turn off.
If everything is still on, there could be some debris in the valves, aging diaphragms, etc.
We would definitely want to ask you a few more questions to help determine the problem.
The normal state of the valve is off, and the solenoid when powered, opens the valve. If everything is staying on when there is no electricity, there is something mechanical prohibiting the valves from closing (like debris). Debris is less likely to be in every valve, unless there was a repair on the mainline that sent debris downstream.
Would be happy to review this with you further. Reach out to our customer support team.
@@Andy_Humphrey Thank you so much!! It ended up being a faulty solenoid so once I replaced it the water can be turned off by manually turning the solenoid. Now the question is: do you have a video on how to connect the wiring of the solenoid?
Can I fix water hammer from this valve? I have water hammer only when the sprinklers turn off. Thanks.
An anti siphon valve isn't likely to fix a water hammer issue. You'd need to determine the cause of the water hammer first, as there are a few different things that could cause water hammer, but a likely culprit in an irrigation system can be the lack of a pressure regulator or a faulty one.
Do I need a backflow valve if I have a anti siphon valve?
Hi Justin! It will depend on the requirements of your local municipality. An anti-siphon valve is a very basic type of backflow, but some local governments will require that a specific type of device be used as a backflow in your irrigation system.
Did you cut your pinky taking the anti siphon cap off? I did the same thing.
Well, there are fortunately many ways to cut your finger in this business. The anti siphon cap wasn't the culprit this time, but there's always the next time! ;)