Non return valve question

[andyaxis]

Since installing a new CO2 system I've tore thru 2 2kg bottles of CO2 in around 3 weeks. I've checked the system for leaks using washing up liquid and water and can't seem to find anything. I've even checked the valves inside my PH controller. When I removed the CO2 lines from the pressure reducer water came out. Checked the non return valve, and when I blow thru it there seems to be a fair amount of resistance to allow air to pass. And yes, I'm blowing the right way . I'm thinking the resistance may be causing pressure build up elsewhere in the system and causing the leak. Should there even be resistance?

 

[G H Nelson]

Hi
Have you had problems regulating the flow of C02 if so you may have used that amount.
Its best that you have a non-return valve before your diffuser.
And one before your bubble counter.
The reason if one fails you have a backup.
And it will stop back flow of aquarium water.
Suck on the out end of the valve,this should open and be easy for air to flow then blow back.
There should be resistance.
And yes there will be pressure when you blow from the in side.
hoggie