For flammable or hazardous areas, the ZWL comes with an explosion-proof motor. Here’s what the “B” suffix means and where these pumps belong.
| Flow Rate | 8–800m³/h |
|---|---|
| Head | 10–80m |
| Inlet / Outlet Diameter | 1.5–75mm |
| Material | Cast Iron,SS304，SS316L |
Some sites can’t use a standard motor — anywhere flammable vapours, solvents or explosive dust may be present, an ordinary motor is a spark risk. For those areas, the ZWL direct-coupled self-priming sewage pump is available with an explosion-proof motor, and you’ll see it in the model code as a “B” suffix.
The ZWL naming can carry material and motor suffixes. Take 50ZWL15-30PB: 50 is the port diameter (mm), ZWL is the direct-coupled self-priming sewage pump, 15 is the flow (m³/h), 30 is the head (m), P means stainless steel wetted parts, and B means explosion-proof motor. So a “PB” unit is stainless-bodied *and* explosion-proof — a common combination, since hazardous-area media is often corrosive too.
An explosion-proof ZWL suits duty around:
You still get the same self-priming, non-clog performance — the pump passes solids up to about 60% of the port diameter and fibre up to five times it, primes itself with no foot valve, and handles corrosive media in the stainless build. The explosion-proof motor simply makes it safe to run where a standard motor can’t go.
Tell us the area classification and the medium, and we’ll spec the correct explosion-proof ZWL for it.
ZWL Direct-Coupled Self-Priming Sewage PumpThe ZWL comes in cast iron or stainless steel. Here’s how to choose the right material by your medium’s pH and chemistry — and not overspend.
ZWL Direct-Coupled Self-Priming Sewage PumpThe “L” in ZWL means direct-coupled — impeller on the motor shaft, no coupling. Here’s what that compact design saves you in space, install time and upkeep.
ZWL Direct-Coupled Self-Priming Sewage PumpThe ZWL passes big solids and long fibre where ordinary pumps choke. Here’s what “non-clog” really means — with the numbers that matter.
