RO Auto Shut-Off Valve Diagram
Written by: Gene Fitzgerald // Last Updated: Aug 15, 2023
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Understanding how to fix issues with your reverse osmosis system requires understanding the system itself.
As they can be complicated, a good diagram comes in handy to get an idea of how your RO system’s components work together to deliver pure and fresh water.
Here is our diagram of an RO auto shut-off valve!
Contents
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RO Auto Shut-Off Valve Diagram
Here is our RO auto shut-off valve diagram:
An automatic shut-off valve is connected by a series of tubing/water lines to the RO membrane and few other components. The housing contains the shut-off valve, which, when triggered by a pressure change, will open or close to provide access to or block off water flow.
- Line 1 brings water from the feed water supply (pre-filters) into the shut-off valve housing.
- Line number 2 carries the water to the RO membrane for filtration. There, it is split into two streams, the wastewater and the filtered water. The wastewater exits through the drain line.
- Water line 3 carries the filtered water back to the ASO valve, but this time on the other side of the diaphragm.
- Water line 4 carries the water onto the storage tank and post-filter.
How Does a Reverse Osmosis Automatic Shut-Off Valve Work?
The combination of an automatic shut-off valve and flow restrictor effectively manages water flow and usage within the RO system, facilitating thorough water purification in the RO membrane, minimizing water wastage, and prolonging the system’s life.
The automatic shut-off mechanism consists of a diaphragm or piston. The diaphragm’s position in the housing is determined by the difference in pressure between the incoming water and the reserve tank’s backpressure. When the pressure in the storage area exceeds about two-thirds of the inlet pressure, the diaphragm forces upwards, stopping the inflow of feed water. Water flow will only recommence when the storage tank pressure reduces after using the RO faucet.
Benefits
- A reverse osmosis automatic shut-off valve prevents more water from flowing into the system once the storage tank is full. Thus, water flow is stopped entirely and no water is being wasted.
- It helps keep the pre-filters and membrane clear and functioning longer by preventing them from getting jammed with too much debris or sediment.
- You do not have to switch the RO system on or off manually.
- Simple installation.
- No electricity is required.
- Push fittings that are easy to connect.
Further Reading:
How to Install an RO Auto Shut-Off Valve
- Turn off the water supply: Before working on your RO system, ensure that the water supply is turned off and disconnect the power supply if applicable.
- Also close the storage tank valve and open the RO faucet until water flow stops.
- Identify the right tubing connections: Determine which tubes correspond to the water supply inlet, outlet, permeate line in, and permeate line out. They will usually be color coded.
- Cut the tubing: If necessary, cut the tubing to an appropriate length, ensuring enough slack to accommodate the ASO valve without causing tension or kinks in the tubing, which may cause blockages or issues later.
- Connect the inlet and outlet water supply lines: Insert the water supply inlet tube into the ASO valve’s ‘in’ port, and connect the outlet tube to the ‘out’ port. Ensure that the connections are secure and there are no leaks.
- Connect the filtered water lines: Attach the permeate lines to the ASO valve’s ‘permeate in’ and ‘permeate out’ ports. Make sure the connections are secure.
- Check for leaks: With all connections made, slowly turn on the water supply to the RO system and check for any leaks at the ASO valve connections. If leaks are detected, turn off the water supply and reseat the tubing connections before retesting.
- Test the system: Once you have confirmed there are no leaks, allow the RO system to run for a short period to ensure that the ASO valve is functioning correctly and shutting off the water flow when the storage tank is full.
If you have any questions about our reverse osmosis automatic shut-off valve diagram please don’t hesitate to leave a comment below!
About the Author Gene Fitzgerald
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