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So if the clean water outlet is completely closed (in this case on purpose by a float valve), then if there is no Auto shutoff valve to stop water from entering the membrane will the pressure equalize completely over the membrane? If so then that would explain the high pressure on the di.When you shut off the flow of water coming out of the DI the pressure will equalize with the incoming. Under normal operating conditions there is not much pressure past the membrane. The greater the pressure difference across the membrane the more efficient the membrane will run.
Where would I get an auto shutoff valve
I have the pressurized water containment tanks and when it reaches 30psi is when the auto shutoff valve stops the flow, it will go higher without the valve.If you have a float valve you need an auto shut off valve as well, to stop flow from going into the membrane section and down the waste drain. The filter won't function properly if you drop your feed pressure to 35psi. The auto shut off valve I don't believe will change the pressure on th di canister though so I don't think it'll fix your problem. There is normally not all that much pressure on the output side of the membrane.
Ihave the pressurized water containment tanks and when it reaches 30psi is when the auto shutoff valve stops the flow, it will go higher without the valve. If the incoming pressure is 70psi then the DI section will climb to 70psi to equalize pressure WITHOUT the shut off valve or if the water is not turned off manually.If you have a float valve you need an auto shut off valve as well, to stop flow from going into the membrane section and down the waste drain. The filter won't function properly if you drop your feed pressure to 35psi. The auto shut off valve I don't believe will change the pressure on th di canister though so I don't think it'll fix your problem. There is normally not all that much pressure on the output side of the membrane.
When I first though that the auto shut off valve wouldn't help I never though about the pressure equalizing across the membrane when there is no flow. With a proper setup the pressure on the di should never get very high, unless it does with a tank. I'm not very familiar with using the pressurized tank.Ihave the pressurized water containment tanks and when it reaches 30psi is when the auto shutoff valve stops the flow, it will go higher without the valve. If the incoming pressure is 70psi then the DI section will climb to 70psi to equalize pressure WITHOUT the shut off valve or if the water is not turned off manually.
With or without the tank, if you do not turn off the water going to the RO the pressure will still increase to what the input pressure is. The tanks I have are for the RO systems designed for drinking water, the diaphragm air pressure is about 5-6psi. I have two 4 gallon and one 10 gallon all under 30psi water pressure. I have it setup this way because I also make drinking water with the DI water going through an alkaline filter for my drinking water, so when I need to fill up my counter top containers I have 10 gallons of water in those tanks to make drinking water. The pressure just from the DI/RO system and going through the alkaline filter will take hours to fill my 3 containers.When I first though that the auto shut off valve wouldn't help I never though about the pressure equalizing across the membrane when there is no flow. With a proper setup the pressure on the di should never get very high, unless it does with a tank. I'm not very familiar with using the pressurized tank.