flooddc July 29, 2012 Share July 29, 2012 Okay, this is the third time I TOTALLY forgot that I left my RODI running. Fortunately, all 3 times I coincidentally stumbling on to the RODI water reservoir and discovered it almost overflow and shut it down. I need a to get an auto shut off. I think I am getting old and forgetful. Anyway, I see that they sell RO shut off kit (auto shut off valve, float valve and check valve). I've also seen just the auto shut off valve. Is it necessary to get the whole kit or can I get away with just the auto shut off valve? Thanks Link to comment Share on other sites More sharing options...
Origami July 29, 2012 Share July 29, 2012 Get the whole kit. The ASOV (auto shut off valve) senses the back pressure from the float valve when it closes. This triggers the ASOV to shut off the source pressure on the membrane. Link to comment Share on other sites More sharing options...
treesprite July 29, 2012 Share July 29, 2012 I don't understand how that would work. It can't turn off the water. I also want to know if it works with faucet adapters. Link to comment Share on other sites More sharing options...
flooddc July 29, 2012 Author Share July 29, 2012 (edited) Get the whole kit. The ASOV (auto shut off valve) senses the back pressure from the float valve when it closes. This triggers the ASOV to shut off the source pressure on the membrane. Cool! I don't understand how that would work. It can't turn off the water. I also want to know if it works with faucet adapters. It's shut of the water flow in your RO/DI and therefore no water flow, even if you have it connected to the faucet. Edited July 29, 2012 by flooddc Link to comment Share on other sites More sharing options...
Origami July 29, 2012 Share July 29, 2012 I don't understand how that would work. It can't turn off the water. I also want to know if it works with faucet adapters. Here's an old drawing of the RO/DI system I had in Ashburn. Notice that the water enters on the left and went through four stages of filtration. This water, under pressure, goes into the ASOV from (1) and exits through (2) before proceeding to the RO membrane. RO water comes out of the membrane and feeds through the ASOV (3) to (4) before entering the DI stage on its way to the RO/DI reservoir. The reservoir has a float valve in it. When the float valve closes, back pressure is sensed by the ASOV. The ASOV responds by shutting off the flow from (1) to (2). The canisters remain under source water pressure, but the RO membrane does not see that pressure because the ASOV has essentially isolated it. Link to comment Share on other sites More sharing options...
Origami July 29, 2012 Share July 29, 2012 BTW, I've had problems with this setup (an augmented Typhoon III) using a booster pump lately (since I'm now on a well). (It's been driving me nuts.) I may have to add a check valve just before ASOV port (3). That may be where flooddc's kit will tell him to put it. It would make sense. I just thought of this when reviewing my old drawing. Link to comment Share on other sites More sharing options...
flooddc July 29, 2012 Author Share July 29, 2012 Thank you Tom for your sophisticated diagram . Yeah, looks like check valve going in port 3. Here is the video from BRS. I might order the kit from them ($25+shipping). I have some credit on ebay, I'll check to see what they have to offer. Link to comment Share on other sites More sharing options...
treesprite July 29, 2012 Share July 29, 2012 I use a faucet adapter to connect the line to the faucet. I have hte thought that if the water is somehow refused passage, the back pressure willmake the water line pop off the adapter and I'll have water blasting out. Note that when the water line is not connected to the adapter and the lever is on filter mode, the water sprays out directly forward - it's no fun standing in front of the sink when I turn the water on with the line detached and the lever in filter position. Link to comment Share on other sites More sharing options...
LCDRDATA July 29, 2012 Share July 29, 2012 After doing the same thing you're describing -- more than once -- I puchased this leak controller/detector from Bulk Reef Supply. So far it has worked like a champ. The sensor is almost too sensitive; once I lost a couple of drops shifting the outlet from my mixing reservoir to my top-off one and it cut off the flow. The alarm is enough to get your attention without being especially obnoxious, and it resets easily. Link to comment Share on other sites More sharing options...
Origami July 29, 2012 Share July 29, 2012 Thank you Tom for your sophisticated diagram . Yeah, looks like check valve going in port 3. No problem. I had the diagram already in my gallery, having used it here in the past. I use a faucet adapter to connect the line to the faucet. I have hte thought that if the water is somehow refused passage, the back pressure willmake the water line pop off the adapter and I'll have water blasting out. Note that when the water line is not connected to the adapter and the lever is on filter mode, the water sprays out directly forward - it's no fun standing in front of the sink when I turn the water on with the line detached and the lever in filter position. Forrest, I received a faucet adapter that has a quick-connect fitting on it. The same kind used to join the stages of your RO/DI canisters. They easily handle water at household pressure without "popping off." The problem with leaving pressure on the RO membrane is that waste water continues to be produced and you shorten the life of the membrane. Link to comment Share on other sites More sharing options...
overklok July 29, 2012 Share July 29, 2012 I just make sure my RO unit floods into the floor drain, so my stupidity is the only thing that shuts it off. No mechanical problems to worry about!!! Link to comment Share on other sites More sharing options...
flooddc August 3, 2012 Author Share August 3, 2012 After doing the same thing you're describing -- more than once -- I puchased this leak controller/detector from Bulk Reef Supply. So far it has worked like a champ. The sensor is almost too sensitive; once I lost a couple of drops shifting the outlet from my mixing reservoir to my top-off one and it cut off the flow. The alarm is enough to get your attention without being especially obnoxious, and it resets easily. Very nice device, but I don't want to add another outlet +$$ I just make sure my RO unit floods into the floor drain, so my stupidity is the only thing that shuts it off. No mechanical problems to worry about!!! Lucky you . Link to comment Share on other sites More sharing options...
flooddc August 3, 2012 Author Share August 3, 2012 Okay, Just got the kit in today. Quickest shipment I ever Rx from Ebay. Cost: ($17 (on sale) - $5 credit = $12). Hooked up and works great. One less thing to worry about. Link to comment Share on other sites More sharing options...
Buckeye Field Supply August 25, 2012 Share August 25, 2012 I know this is an old thread, but I just saw it. Remember that these hydraulic shut offs like this: were originally designed for use with drinking water RO systems. These systems have very slow membranes (e.g., 12 gpd) and a pressure tank that provides gradually increasing back pressure on the membrane as the tank fills. In this hobby we use them with much higher-capacity membranes, and float valves the go from 100% open to 100% closed in a heartbeat. So especially when you need an ASOV to work on a system with a booster pump, instead of the traditional hydraulic shut offs, consider using instead a pressure switch and a shut off solenoid like these: This provides the added benefit of also shutting off the pump when your reservoir is full. Russ Link to comment Share on other sites More sharing options...
clearsky57 August 25, 2012 Share August 25, 2012 BTW, I've had problems with this setup (an augmented Typhoon III) using a booster pump lately (since I'm now on a well). (It's been driving me nuts.) I may have to add a check valve just before ASOV port (3). That may be where flooddc's kit will tell him to put it. It would make sense. I just thought of this when reviewing my old drawing. Where would the booster pump be placed in this diagram? Link to comment Share on other sites More sharing options...
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