Transparent non-return valves
Professional non-return valves with couplings that fit DIN 50, 63, 90 and 110 mm.
The 110 mm non-return valve does not have a coupling. It must be glued in place.
These non-return valves hardly reduce your flow rate. To completely eliminate the slight reduction, install the next larger valve and reduce it.
Transparent valves with an internal flap cover are useful non-return valves. With these parts, the flow is not restricted by a spring, as is usually the case with PVC valves. Non-return valves are used wherever water should not flow back in the event of a pump failure.
Example: 50
mm pipe: 63 mm non-return valve with 63/50 reduction ring = no loss of flow
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| non-return valve | Installation height |
| Ø50 | 21 cm |
| Ø63 | 25 cm |
| Ø90 | 33 cm |
| Ø110 | 25 cm |
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