In water purification equipment, the check valve may be small, but it has a big job: stopping water from flowing backward and keeping the system running steadily.
For folks who make or engineer water purifiers and filters, picking a reliable check valve directly affects how well the equipment works, how long it lasts, and how happy users are with it. This article looks at the industry’s tricky spots, breaks down the 5 main things engineers care about most, and helps you find the right solution for water purification.
First off, why does a check valve matter so much for water purification equipment?
A check valve (also called a non-return valve) controls water flow so it only goes one way. This stops wastewater from rinsing the filter cartridge from flowing back and contaminating the system. It also keeps the water hammer effect from damaging pipes. In reverse osmosis water purifiers, it makes sure the pressure in front of the membrane stays steady, which helps the machine make more water efficiently. If you pick the wrong valve, you might end up with leaks, weird noises, or system breakdowns – and that means higher after-sales costs.
Second, the 5 big issues engineers worry about most, and how to solve them
1. Do the materials meet the safety and durability needs for water purification?
Water purification equipment needs materials that can stand up to corrosion, are non-toxic, and stay stable for a long time.
Recommended solution: Use food-grade plastic (like PP) or rubber. These avoid heavy metal leaks. PP is great for high-purity water systems, for example – it can handle strong acids and alkalis, has a smooth surface, and doesn’t get scaly easily.
2. How to make sure it seals well? And what to do about leaks?
A bad seal can let water flow backward or let outside gunk get in.
Key indicator: Go for a design with an elastic sealing ring (like EPDM rubber). That way, it closes tight even when the pressure is low. A spring that helps it close can make the seal even more reliable.
Maintenance tip: Check the valve discs regularly for wear. If little particles get stuck, they can cause leaks.
PP vs EPDM Physical & Chemical Properties Comparison Table
| Property | PP (Polypropylene) | EPDM (Ethylene Propylene Diene Monomer) | Application Recommendations |
| Temperature Resistance | -20°C ~ 120°C | -40°C ~ 150°C | EPDM excels in high-temperature water/steam environments. |
| Chemical Resistance | Resists acids, alkalis, alcohols; degrades in strong oxidizers (e.g., concentrated sulfuric acid). | Resists hot water, weak acids/alkalis, ozone; incompatible with oils/hydrocarbons. | PP for standard water purification; EPDM avoids oil-containing media. |
| Shore Hardness | Higher (80-100 Shore D) | Lower (50-90 Shore A) | EPDM offers superior elasticity and sealing performance. |
| Abrasion Resistance | High (rigid structure resists wear) | Moderate (requires coatings for enhancement) | PP suits high-flow-rate systems. |
| Weather Resistance | Susceptible to UV degradation (needs stabilizers) | Excellent (UV/ozone resistant) | EPDM ideal for outdoor/exposed installations. |
| Certifications | FDA, NSF 61 compliant (food-grade) | FDA, NSF 61 compliant (food-grade) | Both meet water purification safety standards. |
3. What to do about installation direction and tight spaces?
Installing it the wrong way can block water flow completely – maybe even break the system.
Design fix: The valve body should have a clear arrow showing which way the water flows. It should work for straight or right-angle installation, so it fits in the tight spaces inside most water purifiers.
Installation tip: Flush the pipes really well before putting the valve in. That way, welding slag or other bits won’t mess up how the valve opens and closes.
4. How to get the opening pressure right for the system?
If the opening pressure is too high, it makes the pump work harder. If it’s too low, the valve might close when it shouldn’t.
Matching parameters: Pick a valve with an opening pressure that fits the pump’s output (usually 0.05-0.2MPa). A spring that you can adjust is a good idea – it lets the valve work with different models easily.
5. How to keep noise and shaking down during long-term use?
The water hammer effect and parts wearing out are the main culprits here.
Technical fix: Use a slow-closing design or a built-in damping spring. This slows down how fast the valve closes, cutting down on impact noise.
Third, how to pick the right check valve for water purification?
- Know what you need: Figure out the flow rate, pressure, and what kind of water (pure or wastewater) will go through it. That helps you decide the valve type (like lift or rotary).
- Check certifications: Go for products that have passed international ones like NSF or FDA. That makes sure the materials are safe.
- Look into the supplier: Check how much experience they have in the industry and if they can make custom valves. They should be able to send samples quickly and deliver big orders on time.
Fourth, advantages of our products
Our valves are made just for water purification. All our series use food-grade ABS/EPDM materials, can handle temperatures from -20°C to 120°C, and work in both hot and cold water.
We’ve helped 3 water purifier customers with our diaphragm valve series, like CJT224 and CJT221 – they’ve been a success.
Conclusion
Picking a high-performance check valve doesn’t just make water purification equipment more reliable. It also gives users cleaner drinking water.
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