What is a twin-channel impeller and how does it work?

It is a submersible pump impeller with two closed passages between the suction eye and the volute, instead of a single passage or a turbulent free-flow zone. The two channels distribute flow evenly, reduce radial vibration and keep hydraulic efficiency at a relatively high level for a solids-handling design.

When should I choose twin-channel over vortex?

When the liquid contains dispersed small-to-medium solids — typical of domestic and commercial sewage — and energy efficiency is an important criterion. A vortex is preferable only when the unpredictability of the solids is the dominant factor.

What hydraulic efficiency can I expect from a twin-channel pump?

Typically between 55 and 65%, placing it between the 40–50% of a vortex impeller and the 65–75% of a single-channel equivalent. This middle ground translates into lower electrical consumption than a vortex on continuous loads, for comparable flow and head.

What maximum solid size can a twin-channel pump pass?

Typically up to 30 to 40% of the discharge bore diameter. On a pump with a 2" (≈50 mm) outlet, this corresponds to solids up to about 20 mm. The exact figure per series is given on each product page datasheet.

What other impeller geometries exist for drainage?

Besides twin-channel, the Drainage Pumps category features vortex (free-flow), single-channel and grinder impellers. The choice depends on the type of solids, the efficiency required and the operating duty.

Industrial Catalog

Bi-Channel Submersible Pumps

High efficiency pumps with bi-channel impeller.

A submersible pump with a twin-channel impeller is a drainage pump whose impeller carries two channels — two closed passages between the vanes — instead of a single channel or a recessed vortex geometry. This layout delivers a compromise between hydraulic efficiency and solids passage: less efficient than a single-channel impeller but more efficient than a vortex, with the capacity to pass dispersed medium-sized solids without significant clogging risk.

Impeller type: Twin-channel (two passages)
Solids passage: 30–40 % of discharge Ø
Typical efficiency: 55–65 % (vs 40–50 % vortex · 65–75 % single-channel)
Published series: Patrol · Titan · WFD
Power supply: Single-phase 230 V · Three-phase 400 V
Applications: Sewage · wastewater · commercial effluents

2 products Bi-Channel Submersible Pumps

Eletrobombas submersíveis Patrol e Titan JOVAL

Patrol & Titan Submersible Electric Pumps

Electric pumps ideal for pumping wastewater and effluent drainage

Eletrobomba submersível WFD JOVAL vortex e bicanal

WFD Submersible Electric Pumps - Vortex & Bicanal

Submersible electric pumps for wastewater and drainage, available in Vortex and Bicanal versions.

Typical hydraulic efficiency on a twin-channel impeller sits between 55% and 65%, against 40–50% for a vortex impeller and 65–75% for a single-channel equivalent. Solids passage typically covers 30 to 40% of the discharge bore diameter. This middle ground makes the twin-channel the natural choice in domestic and commercial wastewater lift stations where the liquid contains dispersed particles but rarely large unpredictable solids — situations where the extra energy cost of a vortex impeller is not justified.

The range published on this page covers the Patrol and Titan series distributed by JOVAL for more demanding industrial loads in single-phase and three-phase versions, and the WFD series in a compact body, available in a twin-channel variant for small and medium installations. These series are also presented — together with the other impeller families — in the main Drainage Pumps category, where they can be compared against vortex, single-channel and grinder alternatives. For duplex configurations with automatic alternation between two pumps, the direct complement is the BA2CF control panel manufactured by JOVAL.

Frequently asked questions

What is a twin-channel impeller and how does it work?

It is a submersible pump impeller with two closed passages between the suction eye and the volute, instead of a single passage or a turbulent free-flow zone. The two channels distribute flow evenly, reduce radial vibration and keep hydraulic efficiency at a relatively high level for a solids-handling design.
When should I choose twin-channel over vortex?

When the liquid contains dispersed small-to-medium solids — typical of domestic and commercial sewage — and energy efficiency is an important criterion. A vortex is preferable only when the unpredictability of the solids is the dominant factor.
What hydraulic efficiency can I expect from a twin-channel pump?

Typically between 55 and 65%, placing it between the 40–50% of a vortex impeller and the 65–75% of a single-channel equivalent. This middle ground translates into lower electrical consumption than a vortex on continuous loads, for comparable flow and head.
What maximum solid size can a twin-channel pump pass?

Typically up to 30 to 40% of the discharge bore diameter. On a pump with a 2" (≈50 mm) outlet, this corresponds to solids up to about 20 mm. The exact figure per series is given on each product page datasheet.
What other impeller geometries exist for drainage?

Besides twin-channel, the Drainage Pumps category features vortex (free-flow), single-channel and grinder impellers. The choice depends on the type of solids, the efficiency required and the operating duty.

Technical Support

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Our technical team can help select the right equipment for your installation. Contact us with your project details — borehole depth, required flow rate and application.

Bi-Channel Submersible Pumps