Syphoning problems

[bowlingo]

What about this one...

http://www.seascrew.com/browse.cfm?PLASTIC-ONE-WAY-VALVES---STRAINERS&l=0000000408

The 1/2" or 3/4" one down the page?

It all depends on what pressure opens the valve though and if it can be submerged in the main tank..

 

[ChrisR]

Why faff with that? Valves leak, if you're using a level switch you don't need any.
Besides, it's a one way valve, it's designed to let water throough...

Make A Hole!!

 

[spraggo]

These are one way valves not spring loaded check valves. There is no problem submerging the brass valve in water for long periods. Why not get a copper copper 15mm compression valve and use a couple of 15mm copper tails to connect to the hose with jubilee clips. What head of water is the pump capable of lifting?.

 

[Norcon]

I'd go with Doitalls option. A ball valve.
And no energy consuming machines needed.

Is this a rainwater harvesting project?

 

[bowlingo]

Why faff with that? Valves leak, if you're using a level switch you don't need any.
Besides, it's a one way valve, it's designed to let water throough...

Make A Hole!!

Thanks Chris...that look like a good plan..trouble is I havent got the room in the main tank due to 2 other pumps, switches, cables etc to come up then back down..

 

[bowlingo]

I'd go with Doitalls option. A ball valve.
And no energy consuming machines needed.

Is this a rainwater harvesting project?

Its a hydropnics project...see a few posts back

 

[bowlingo]

These are one way valves not spring loaded check valves. There is no problem submerging the brass valve in water for long periods. Why not get a copper copper 15mm compression valve and use a couple of 15mm copper tails to connect to the hose with jubilee clips. What head of water is the pump capable of lifting?.

This sounds like a good plan...the valve came with 2 x compression glands with olives the problem is I have heard hydroponic nutrients dont like copper pipe. im going to give it a go now, drop the valve, glands, copper tails and jubillees into the main tank and see if the dribbling stops I will then re-think on the pipe material if it works..

 

[dumbrill]

Use a stand pipe like the sketch above. This is what I did with my boiler condensate discharge recently to stop the trap syphoning out.

 

[Youllneverguess]

Might be an idea to lay off your produce a little too

 

[bowlingo]

Holy cats alive...the fu##ers still dribbling when the pump turns off with valve in main tank with compressions and jubilees

 

[bowlingo]

What about this one...

http://www.diy.com/diy/jsp/bq/nav.j...ationsSpecificProductType=double_check_valves

or this one (same but cheaper)

http://www.toolstation.com/shop/Plumbing/Pushfit/Double Check Valve/d20/sd3143/p83191

Do you think they can be submerged..I am asuming there is something wrong with the one I have due to it continuing to dribble into the second tank when the pumps off?

The pump im using is of the following specs

•Lift: 0.95M
•Maximum Output: 490 L/H

 

[spraggo]

If you have installed the valve correctly, arrow pointing in the direction of flow, and the outlet joints are secure and not letting water in. It indicates that the valve is not seating properly due to debris or being faulty.

 

[bowlingo]

If you have installed the valve correctly, arrow pointing in the direction of flow, and the outlet joints are secure and not letting water in. It indicates that the valve is not seating properly due to debris or being faulty.

I am going to get this one tomorrow..

http://www.toolstation.com/shop/Plumbing/Pushfit/Double Check Valve/d20/sd3143/p83191

This is a double check valve..im having problems understanding what that means..can I simply push the copper pipe into each end, drop it in the main tank and it will work like the other one is supposed to?

 

[spraggo]

Yes.

 

[doitall]

A non return valve is useless for what you want.
They are designed to stop water backflowing.

In this case the direction of flow will be from the pump to the small tank.