Advise needed!

[CalciumReef]

Anyone has any suggestion for a one way valve?Meaning to say the water has no chances of backflow?Thankz

[ah^siao]

there are alot of ways to do.. one way is to calcuate the volume of water that will be flowing back to your tank when one day your pump fails... make sure it is sufficent

[ah^siao]

or when drill a hole in your pipe to prevent the ewater from flowing back.. meaning there is a air to sub the water and this will ensure that the water will not flow back... you know the pipe gg back to your tak? dril a hole at the bottom of the pipe.. dun drill at the top.. if top will have air being suck in

[ah^siao]

sorry my explaination not that clear....

[CalciumReef]

i think i know what you trying to say...Cos that day my power at hm tripped....flooded cos my bottom tank not high enough...but i have found another way...will try it out...Thankz for the help BTW

[vincegoh]

i think i know what you trying to say...Cos that day my power at hm tripped....flooded cos my bottom tank not high enough...but i have found another way...will try it out...Thankz for the help BTW

What is the other way???

[CalciumReef]

I made an acrylic box to hold the extra water in case of power failure....so when in operation,water overflows from the box

[terryansimon]

you can install a check valve? something like that the human vein has....check valves to prevent blood backflow. not sure if they have such thing in pipings, though. but should have lah.

[CalciumReef]

i think stick with the box better cos taking out the pipes will mean disaster

[vincegoh]

or when drill a hole in your pipe to prevent the ewater from flowing back.. meaning there is a air to sub the water and this will ensure that the water will not flow back... you know the pipe gg back to your tak? dril a hole at the bottom of the pipe.. dun drill at the top.. if top will have air being suck in

I am interested in your idea. However, in normal operation, won't the water spray out from the hole even though it is at the bottom?

Do you have a diagram to illustrate? Thanks

[nutx]

I am interested in your idea. However, in normal operation, won't the water spray out from the hole even though it is at the bottom?

Do you have a diagram to illustrate? Thanks

There is valve in piping, but expensive, like $20-50 each, depending on the size of pipe.

For the hole, it should be below the water level, but the backflow level will not flood your tank.....(I'm quite 'expert' in this after some flooding experienec!!!

[reefer guy]

hi! just add this in another topic so maybe i have to quote myself again... hope this will help u.....

it's true, if ur return pump fails water will overflow the sump... solution:

1) maintain the water in such a way that even if REVERSE FLOW happens, the water in the overflow box will dry up first before it can fill up the sump to overflow level....

2) make ur return pipe nearest possible to the water surface so once it grasps air, the REVERSE FLOW will stop... another way is drill a small hole at the return pipe just right above the water surface, it will weaken the return pressure abit but in case of return pump failure, it will cut off the siphon due to air sipping in the whole.

[ah^siao]

it will cut off as the air siphon in

[Cookiemunster]

Ah Siao is right.

What he is trying to say is drill a hole at the return pipe which is in your main tank at the point (outlet) just below the water level. When power failure and the water flows back into sump, the water in the tank will drop below the drilled hole and suck in air. Hence breaking the siphon effect.