Water pump w/o siphon

[St3ve]

I'm looking to get a water pump (submersible or not) that will NOT siphon water when the pump is off. Meaning, I have a rez that is taller than the plants I want to water, so after the pump is turned off it will continue and allow water to be siphoned out of the rez.

does such a pump exist?

 

[PuReKnOwLeDgE]

Install a shutoff valve?

 

[Treetroit City]

Use an anti siphon fitting or just put a hole in your line that will drain back into rez

 

[CannabisTHC]

Put a small hole in your tubing above the water line in your res to allow air to enter the tube and stop the siphon. Problem solved without any money being spent.

If it starts spraying out of your res just add a 90 degree barb to the hole, remember you don't need a very big hole at all.

EDIT: whoops typing my post when you got the other 2 responses.

 

[rives]

I've never seen a pump with an attachment to accomplish that but you could install a vacuum breaker, preferably at the high point in the plumbing. It is a small valve that will shut when the line is pressurized, but pulls open under vacuum conditions in order to break the siphon. They can "burp" a little water as they close, so getting one with a fitting to contain and drain this water away is a good idea.

Simply putting a hole in the top of the pressure line at the high point, or plumbing a "T" and nipple with a pipe cap and bleed hole can accomplish the same thing if the pump volume and pressure are such that water won't be forced out of the hole when the pump is running.

http://www.mcmaster.com/#vacuum-breaking-bleed-valves/=gw4tf3


*edit* Sheesh, you guys are on it today! Apparently I should check back when I get a phone call in the middle of posting.

 

[St3ve]

Awesome.. I have never thought of simply putting a hole in the hose.. simple, yet brilliant.

Thanks for the help, I love you guys.

 

[PoopyTeaBags]

do this... have your pump go up and put a 90 elbow on it.. in the center of the elbow grab a drill and drill a small hole in that elbow. Itll drain some water out when you turn it on and when you turn it off that little hole will stop the suction...

 

[PoopyTeaBags]

man you fuckers are fast today lol

 

[Hammerhead]

Simple answer is a check valve. Just find the size you need

http://www.amazon.com/MR-Aqua-Plast...F4/ref=sr_1_13?ie=UTF8&qid=1333146373&sr=8-13

 

[rives]

Simple answer is a check valve. Just find the size you need

http://www.amazon.com/MR-Aqua-Plast...F4/ref=sr_1_13?ie=UTF8&qid=1333146373&sr=8-13

Spring-loaded check valves can work in this application, but it requires balancing the spring tension vs. the vacuum exerted by the siphoning action. The type of check valve that you linked is to keep water out of air pump in case of power failure, and won't work in this application - the flow doesn't get reversed when the reservoir is higher than the discharge point, it just keeps going after the pump turns off because of the siphon effect.

 

[Guest 18340]

The black tubing I'm pointing to is my anti-siphon tube. I can adjust how high up in the rez it is by pulling up on the blue feed line. Simple, effective, and it hasn't ever let me down in 4 years of use

 

[Hammerhead]

I use 3 check valve's on my Aquarium works just fine when the power goes out...I have never balanced anything. Installed powered off the pump(2500gph) no Siphon.. These are the ones I have. I did not look at the one I posted just searched check valve..The drilling off holes works as well I have some on my overflow tubes.


http://www.marinedepot.com/True_Uni...Valves-Plumbing_Parts-FT9133-FIFTVLTC-vi.html

 

[rives]

I use 3 check valve's on my Aquarium works just fine when the power goes out...I have never balanced anything. Installed powered off the pump(2500gph) no Siphon.. The drilling off holes works as well I have some on my overflow tubes

What kind of a circuit are you talking about, HH? A check valve works great in a situation where you want to eliminate the possibility of a flow reversal, but if the flow continues the same direction from siphoning, the only way that I it working is if the check is closed by spring tension greater than the weight of the column of water.

 

[Hammerhead]

?? Not sure what you mean.. I have them right now. there used 24/7 360 days a year.. The pump is below the tank if the power goes out the water will siphon back from the pump line. The check valve does not have a spring in it. It is hinged at the top called a flapper check valve

When water attempts to go backwards through the valve the flapper closes and prevents the water from going through the valve

 

[rives]

?? Not sure what you mean.. I have them right now. there used 24/7 360 days a year.. The pump is below the tank if the power goes out the water will siphon back from the pump line. The check valve does not have a spring in it. It is hinged at the top called a flapper check valve

In your application, what you are trying to stop is the water reversing flow - if the power goes off, the pump shuts off and create a siphon, dragging the water backwards through the pump. Perfect application for a check valve. In the OP's case, his reservoir is higher than the discharge point, and the siphon effect will keep the water flowing the same direction that the pump had been moving it. Even if there were a check valve, it wouldn't have an opportunity to close - the water just keeps going the same way the pump was moving it.

 

[Hammerhead]

ah ya the rez needs to be lower to use them.. Just driil some holes then .. I missed that part my rez is lower then my plants but I hand water.. I would have the rez lower then the table.. I have never seen a rez higher then the table.. Maybe he has no table and the plants are on the floor? Drill a few hole should fix that

 

[Benvanboro]

So if my water level is lower than my octa bubblers at all times this won't happen?
Sorry, I just set up my first drip system 2 weeks ago, and am only reading about this siphon effect the past 2 days. I have not experienced it at all. My bubblers are almost 1ft above the highest water level, and the pots themselves are a few inches lower then that.

In your application, what you are trying to stop is the water reversing flow - if the power goes off, the pump shuts off and create a siphon, dragging the water backwards through the pump. Perfect application for a check valve. In the OP's case, his reservoir is higher than the discharge point, and the siphon effect will keep the water flowing the same direction that the pump had been moving it. Even if there were a check valve, it wouldn't have an opportunity to close - the water just keeps going the same way the pump was moving it.