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Old 02-13-2013, 04:58 PM
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MY RO/DI unit has an Automatic Shut Off Valve, so shuts off the supply water when not in use and saves the membrane. Here is how it works. I have 2 pressure storage tanks, too, so always a good supply of RODI water on hand.


What is an ASOV and what does it do?
Automatic shut-off valve is a must. It saves water, extends filter life, and improves the performance of your unit. As the storage tank fills the pressure inside increases, when the pressure equals ½ to 2/3 your feed water pressure, the water to the system is shut off. No waste. Since you subtract the storage pressure from the operating pressure, the storage pressure needs be limited.
What is ASOV?

The automatic shut-off valve. This valve allows your system to turn off the water supply, using pressure from the pure water side of the system. Then the automatic shut-off valve will turn off the water supply to the unit,whenever there is sufficent pressure on the pure water side of your system.
ASOV - How it works?
The automatic shut off feature works this way. The pure water runs right to left or left to right across the top of the valve, the side with the screws visible. (The right or left depends on how you are viewing the unit) Then the filtered water runs right to left or left to right across the bottom of the valve. When the pressure on the pure water side of the system builds to 60% of your home water pressure a small piston is pushed down and closes off the supply water. The entire unit shuts down shortly. We offer LIFETIME replacement on that part. It is the only real moving part on the system. You need to see if the screws on top of the valve can be snugged up, if that does not cure any the noise we will send a new ASOV right out. System shuts off when the tank is full or the line from the reef line is shut off.
How to Install ASOV?
Looks very complex, but is really very simple. The water is simply traveling across the valve from left to right or right to left depends on how you look at it. Pure water travels across the top of the unit, the filtered water across the bottom. The valve has a top and a bottom. The top is the side with the (4) screws visible. The bottom has no visible screws and is marked in and out. The bottom of the valve is connected between the pre-filters and the membrane. Water from the pre-filters is directed to the ASOV(in). The filtered water continues from the out of the ASOV to the membrane end with only one connection, the membrane water inlet. So the bottom of this valve got in between the filters and the membrane. The top the side with the (4) screws connects across the pure water line, from the membrane pure water outlet. The pure water outlet of the membrane is on the membrane housing end with two connections. One connection goes to drain and the other is the pure water. The drain connection is not the one you want. Once you have located the pure water line, cut it and install the automatic shut off valve. Now the pure water path is interrupted by the ASOV as well.
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Last edited by Reef Pilot; 02-13-2013 at 05:01 PM.
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