BK Posted January 18, 2006 Report Share Posted January 18, 2006 I need to find a valve for a 20mm tube so if my pump stops it wont become a syphone. I'm in CHCH so local would help. I have a brass one but not to keen on connecting this what do people think. Quote Link to comment Share on other sites More sharing options...
Sharkey Posted January 18, 2006 Report Share Posted January 18, 2006 Are you talking about the pipe into the display tank. From a sump? Quote Link to comment Share on other sites More sharing options...
Caryl Posted January 18, 2006 Report Share Posted January 18, 2006 I would have thought the lfs would have them. Quote Link to comment Share on other sites More sharing options...
BK Posted January 18, 2006 Author Report Share Posted January 18, 2006 Yep coming out of sump back into row of 6 tanks. Not sure if Brass fitting would be ok for my Discus. Quote Link to comment Share on other sites More sharing options...
BK Posted January 18, 2006 Author Report Share Posted January 18, 2006 LFS only stock product for standard items used, ie air line and filter hose. Have never seen a LFS that stocks hose fittings etc Quote Link to comment Share on other sites More sharing options...
freshwest Posted January 18, 2006 Report Share Posted January 18, 2006 A commercial irrigation shop will have 20 mm plastic check valves. One thing you may need to think about is the head you will create with the pump having to open the check valve when running. The other option is to have less water in your sump so that it can handle the back flow if the pump is off. You can minimise the amount of water that can be siphoned back to your sump by having a small hole just under the surface of your inlet line so that when the siphon starts due to a power cut it will only siphon water out until it reaches the hole then the siphon will be broken due to air being sucked through the hole, or have your spray bar very close to the surface . Hope that makes sense? Quote Link to comment Share on other sites More sharing options...
BK Posted January 18, 2006 Author Report Share Posted January 18, 2006 Have plenty of pressure, only using 30% now so can cope with valve. Would lose about 30ltr if over flows and can't run with less water as wouldn't have any excess to syphone out for water changes. Cheers for the help. Quote Link to comment Share on other sites More sharing options...
Feelers Posted January 18, 2006 Report Share Posted January 18, 2006 Head down to Mico Plumbing, they'll have everything you need. Quote Link to comment Share on other sites More sharing options...
BK Posted January 18, 2006 Author Report Share Posted January 18, 2006 Sweet as . Anyone have any thoughts on brass taps etc. Brass-Copper ?????? Quote Link to comment Share on other sites More sharing options...
caserole Posted January 18, 2006 Report Share Posted January 18, 2006 This post has a link to hansen check valves http://www.fnzas.org.nz/fishroom/hansen ... 10206.html as for the question whether to use brass or not - i think most fresh water fish wouldn't care, but do you want to take the risk when plastic is available. Quote Link to comment Share on other sites More sharing options...
Alan Posted January 19, 2006 Report Share Posted January 19, 2006 I know of a discus breeder wiped out by copper poisoning. I'd keep away from metal fittings. Alan 104 Quote Link to comment Share on other sites More sharing options...
cracker Posted January 21, 2006 Report Share Posted January 21, 2006 If your sump is big enough, it wont need a valve. They only cause issues later on anyway. It can only siphon down to the "pump in" pipe and then stop. Quote Link to comment Share on other sites More sharing options...
shiuh Posted January 21, 2006 Report Share Posted January 21, 2006 i have doing a lot of irragation fittings search lately, irragation warehouse in blenheim rd has quite a range of products. but i havent check out mico plumbing. mitre 10 mega has some hansens fittings too but sometimes they all sold out. Quote Link to comment Share on other sites More sharing options...
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