The mechanical seal is what keeps a ZWL pump from leaking — and what wears in abrasive or hot media. Here’s how to choose the right seal for your duty.
| Flow Rate | 8–800m³/h |
|---|---|
| Head | 10–80m |
| Power | 1.5–75kW |
| Inlet / Outlet Diameter | DN25–DN300 |
| Material | Cast Iron, SS304, SS316L |
Not sure this pump fits your duty? Try the pump selector
The mechanical seal is a small part that decides a lot. On a ZWL direct-coupled self-priming sewage pump it’s what stops the medium leaking out along the shaft — and it’s one of the parts that wears in tough duty. Getting the seal right for your liquid means fewer leaks and longer runs between service.
The ZWL uses a mechanical seal at the shaft. In clean-ish water it lasts a long time. But in abrasive, gritty or hot media, the seal faces are the front line — abrasive particles score soft faces, and heat degrades the elastomers. A seal that suits clean water can fail quickly on slurry or hot effluent, so the seal spec should follow the medium.
When a ZWL leaks along the shaft, the seal (or the sealing ring behind it) is usually the cause — both are normal wear/service items and are quick to replace.
Tell us the medium — abrasive, corrosive or hot — and we’ll spec the right seal so it isn’t the weak link.
ZWL Direct-Coupled Self-Priming Sewage PumpA self-priming pump holds liquid inside — which can freeze in winter. Here’s how to protect a ZWL pump in cold weather so it primes when you need it.
ZWL Direct-Coupled Self-Priming Sewage PumpWhen one pump isn’t enough or downtime isn’t an option, ZWL pumps run in parallel or duty/standby. Here’s how to set that up sensibly.
ZWL Direct-Coupled Self-Priming Sewage PumpWhich ZWL pump parts wear, and which spares to keep on the shelf? A practical guide to impeller, mechanical seal, sealing ring and bearings.
