help needed here !

[chercm]

what do u call this ?

this valve is fixed to the return pump to prevent back flow into the sump

pls help

[mopiko]

non return valve?

[burnerj]

Cherm,

u can use a non-return valve but accordine to my experience, there will still be return but a small slow stream of water back. My sugesstion is to open an airhole near the return mouth of the piping so when air is collected with the backflow then will stop the siphon.

As most of the non-return valve sold in hardware store are spring type, it will be prone to RUST.

My 2 cents worth... cos i was planning a non-return valve but was stopped by my tank maker.

[vt_snowman87]

just a question,

will opening a air hole affect the flow rate? the air hole is in the water? or above the water surface?

[LaW]

those are called check valves.

there are different kinds.

spring type, ball type etc.

be warned, i used to use check valves but the output had be lessen to quite abit, thats why i gave up using.

happy lunar new year David

[MbmC]

Interestingly I just used a check valve in my return circuit. Had problems with output so I decided to remove the spring, which did the trick. There's no return when the weight of the water column is pushing the valve back in place, and the output from my pump is significantly better. Plus there's no downside of rusting springs.

[mopiko]

Interestingly I just used a check valve in my return circuit. Had problems with output so I decided to remove the spring, which did the trick. There's no return when the weight of the water column is pushing the valve back in place, and the output from my pump is significantly better. Plus there's no downside of rusting springs.

can try getting tunze check valve. got 1 with a spring and was told its not suitable for marine, so they changed a new one with out spring, which can be use for marine.

[reefer guy]

air hole on the outlet near to water surface is advisable. check valves will corrode in our reef tanks in time. if your system is maintaining high calcium, calcium deposits will build up on the check valves and will render it useless.

[Gouldian]

http://www.aquaticeco.com/index.cfm/fuseac...gories/ssid/352

Agrees with Jon, easiest solution is to buy an handheld electric drill.... problem solved.

[MbmC]

I'm a bit kiasu...Have drilled that hole.

And have a check valve that I've removed the spring from