YW Series Vertical Submerged Sewage Pump: A Pump That Stays Dry on Top

When you walk into a wastewater treatment plant or a factory sump room, you usually see one of two pump types: a fully submersible pump sitting in the wet well, or a long vertical column pump standing on top of the pit with the motor up in the open air. The YW series belongs to the second group. In the pump world, this is called a vertical submerged pump, a vertical sump pump, or a vertical immersion pump — all names for the same basic arrangement: motor above, long shaft down, impeller in the liquid.

Why Would You Choose This Layout?

The whole point of putting the motor above the liquid is simple: you can service it without draining the pit. On a submersible pump, every inspection means lifting the whole unit out of the sewage. On a YW vertical sump pump, the motor, coupling and upper bearing stay dry and easy to reach. For deep pits, continuous-duty service, or corrosive liquids, this matters more than you might think.

YW vertical sump pump structure: motor on top, long column shaft, pump end submerged

How the YW Pump Is Built

The construction is straightforward once you see it:

• Motor — standard vertical electric motor mounted on the motor base
• Coupling — connects motor shaft to the extended column shaft
• Column pipe — the long tube that drops into the sump, carrying the discharge up and protecting the shaft
• Mechanical seal — dual acting tandem seal with tungsten carbide faces, designed for over 8,000 hours of continuous operation
• Impeller — single-channel or double-channel non-clog design, can pass long fibers up to 5 times the pump outlet size and solid particles up to 50% of the outlet diameter
• Pump body and discharge bend — discharge pipe comes out sideways at the mounting plate

Materials for Different Liquids

Not every wastewater is plain water. Depending on what you are pumping, the wetted parts can be specified in:

• Cast iron — standard for municipal sewage, rainwater, non-corrosive effluent
• 304 stainless steel — for food industry, light chemicals, corrosive but non-acidic drainage
• 316 stainless steel — for chloride environments, coastal plants, paper mills, chemical effluent
• Fluoroplastic (PVDF/PTFE lined) — for strong acid, alkali and aggressive chemical liquids where ordinary stainless steel would corrode

Typical Performance Range

The YW series covers a wide range — from small 25mm outlet pumps doing 8 m³/h at 1.1 kW, up to large 500mm outlet units moving 2600 m³/h. The shaft length (submerged depth) is adjustable from 0.5 m up to 7 m, so it can be matched to your actual pit depth rather than the other way around.

Where the YW Pump Is Used

In real projects, we see the YW series specified for:

• Municipal wastewater treatment plants and sewage pumping stations
• Industrial effluent from chemical plants, paper mills and textile factories
• Hospital and hotel drainage where easy maintenance matters
• Mining and quarry dewatering with dirty, abrasive water
• Construction site and civil engineering drainage
• Agricultural biogas tanks and farm irrigation sumps
• Underground parking and basement flood sumps

Working Conditions

Standard version handles liquid up to 60°C, specific gravity up to 1.3 kg/dm³, and pH between 5 and 9. For hotter, more corrosive or more abrasive liquids, let us know the exact medium and we will recommend the right material and seal combination.

Need a Quote?

Send us your required flow, head, sump depth and the liquid you are pumping. We will recommend the exact YW model and shaft length, and confirm the material combination for your duty.