Cost-effective sewage transport via dry-well installation

Whether in intermediate pumping stations, collection pumping stations, or wastewater treatment plants, the Wilo-Rexa BLOC series—equipped with clog-resistant free-flow or single-channel impellers—ensures safe, flood-proof sewage transport, even during continuous operation. Energy costs remain low thanks to standard IE3 motors and high overall efficiency. Maintenance and repair are simplified by the "back-pull-out" design, which reduces operating costs.

(*According to IEC 60034-30-1 standard)

Features/Product Advantages

High operational reliability due to a closed bearing housing featuring an oil-filled seal chamber, an additional leakage chamber, and dual mechanical seals
Low energy costs due to high overall efficiency
Long service life—even when pumping abrasive or corrosive media—thanks to various Ceram coating options
Low operating costs due to the back-pull-out design, enabling easy and time-saving maintenance
High flexibility regarding on-site space constraints, with options for horizontal or vertical installation

Product features of the vertical Wilo-Rexa BLOC

Flange connections compliant with DIN and ANSI standards
Drain plug
High-efficiency, clog-resistant single-channel or vortex impellers
Optional Ceram coating
Optional IE3 and IE4 motors (according to IEC 60034-30-1 standard)
Closed bearing housing design
Easy maintenance via back-pull-out design

Construction

Sewage pump with block design and standard motor for stationary dry-well installation, suitable for continuous operation.

Equipment/Functions

Hydraulic unit with seal chamber and leakage chamber
Sealing system with dual mechanical seals
IEC standard motor with IE3 energy efficiency class

Model code

Technical data

Mains connection: 3~400 V, 50 Hz
Operating mode: S1
Protection class: IP55
Insulation class: F
Fluid temperature: 3 … 70 °C
Ambient temperature: 3 … 40 °C
Motor efficiency class: IE3

Materials

Pump housing: EN-GJL 250
Impeller: EN-GJL 250
Hydraulic unit shaft: Stainless steel 1.4021
Bearing housing: EN-GJL-250
Motor housing: EN-GJL-250
Seals
Static: NBR
Pump side: SiC/SiC
Motor side: SiC/SiC

Type

Sewage pump in block design equipped with a standard motor, designed for stationary dry-well installation; suitable for continuous operation.

Hydraulic unit

The hydraulic unit—comprising an axial suction port, radial discharge nozzle, and bearing housing—forms a compact, enclosed assembly. Connections are designed as flanged joints.

Seals

The bearing housing features a seal chamber and a leakage chamber to collect any fluid penetrating past the seals. Sealing on both the fluid side and the motor side is achieved via a double mechanical seal. The seal chamber is filled with medical-grade white oil; the leakage chamber remains empty and is sealed off from the motor.

Motor

IEC standard motor (B5 design), three-phase AC motor with IE3 efficiency class.

As-delivered condition

Complete unit for horizontal installation, equipped with a three-phase AC standard motor; supplied without power cable.
Discharge connection fitted with an angle bracket for attaching lifting equipment.
Installation and operating instructions.

Options

IEC standard motors available in various specifications:
Motor efficiency class IE4
Explosion-proof certification (ATEX or FM)
Motor overheat protection via bimetallic or PTC sensors
Version for vertical installation
Pump head variant

Accessories

External rod electrode for seal chamber monitoring
Control switches and relays
Mounting kit including anchor bolts