MwStop® Bypass

Energy-efficient backflow protection for rainwater and wastewater

Exclusively europe made components

This is why the MwStop® Bypass solution?

Sewer systems and receiving water bodies can become overloaded during heavy rainfall,
storm surges and high water levels. If the drainage system cannot accommodate the water, water may be forced back towards the building.

Reduced operation without compromising safety

Pumps remain on standby during normal operation
Automatic closing in the event of backflow
Continued discharge during the event
Lower energy consumption and reduced wear

This is the MwStop^® Bypass

A hybrid bypass shaft combines a backwater valve and a pumping station in one energy-efficient solution. During normal operation, rainwater and wastewater are discharged by gravity. In the event of backflow, the backwater valve closes and the pumps divert the water around the closed valve.

1

Gravity drainage first
Uses natural gravity flow during daily operation.
2

Automatic protection
Closes in the event of backflow from the sewer system or receiving water body.
3

Bypass pumps
Only pumps when the shut-off device is closed.
4

Return to gravity drainage
Automatically opens again as soon as normal conditions are restored.

Traditional pumping station vs. MwStop^® Bypass

Uses gravity drainage during normal operation and activates the pumps only in backflow situations.

Pumptime

Traditional pumping station

Continuously pumps the incoming water
Longer pump operating time, higher energy consumption and increased wear
Often dimensioned for continuous operation

MwStop®Bypass

Gravity operation in everyday use
Pumps only in the event of surcharge or backflow
Protects the building while water continues to be discharged

This is how the MwStop^® Bypass works

The operating cycle is simple: gravity drainage during normal operation, closing and bypass pumping in the event of backflow, followed by an automatic return to gravity drainage.

1 Normal operation

Gravity Drainage

The backwater valve is open. Water flows freely through the shaft by gravity.

2 Backflow

MwStop® Bypass

The backwater valve closes towards the sewer system/receiving water body. The pumps divert the water around the closed valve.

3 Back to normal

Gravity Drainage

When the backwater level decreases, the system automatically opens and the pumps stop.

Sizing and planning

The right solution depends on flow rate, type of water, backwater level and the building’s risk profile.

1

Flow rate and pipe dimensions
Incoming rainwater/wastewater flow, pipe dimensions and required discharge capacity.
2

New or existing shaft?
Available as a prefabricated concrete or PE shaft. Retrofitting in an existing shaft is possible.
3

Backwater level
The highest backwater level of the drainage system is taken into account.
4

Pump selection
Pumps are selected for low delivery head/back pressure and the required free passage.
5

Rainfall intensity
Return periods (T5, T10, T50, T100)
6

Robustness
Industrial-grade quality. Metal instead of plastic

MwStop® Bypass Schacht aussen mit innenansicht

Control, alarm and service

Operational reliability requires clear control, alarm notification and regular maintenance.

Outdoor electronic control box for the MwStop® Bypass

Frost-protected control system

The control panel is installed in the technical room or in a frost-protected outdoor cabinet.

Closed outdoor electronic control box for the MwStop® Bypass with an active alarm light/ indicator

Alarm and monitoring

Acoustic/visual alarm with the option of GSM, SMS and remote alarm notification.

Tablet with control software for the MwStop® Bypass

Service contract

Annual service and maintenance inspectionas well as functional testing.

System configuration

Schematic illustration of the MwStop® Bypass

The system is dimensioned according to the specific installation and can be adapted to rainwater, wastewater and combined sewer systems.

1

Flow-through shaft

Daily drainage via gravity sewer lines
2

Shut-off unit

Automatic closure against backflow from the sewer or receiving water body
3

Self-test

Pumps and backflow preventer, automatic self-test
4

Pump unit

Typically two pumps for reliable bypass pumping during an event
5

Control and alarm

Automatic operation, alarm, and clear operating instructions.

Norms and requirements

EN 12056 & EN 1610 as well as Danish Standard DS 432 and functional requirements

Planned as a combination of a backwater valve and pumping system, with requirements for closing, alarm, access and safe operation.

Bypass system
= Backwater valve + pumping system

The aim is to avoid unnecessary energy consumption caused by continuous pumping when gravity drainage can be used during normal operation.

Alarm
Bypass systems are equipped with an alarm for high water levels and operational faults.

Metal components = no rat damage
Industrial-grade quality and high operational reliability.

Safe elevation level
Adjustable level measurement for the correct height clearance from vulnerable floors/surfaces.

Service access
The shaft and components must be accessible for inspection and maintenance.

Service & maintenance
Small number of users: at least once a year. Large number of users: at least twice a year

Where is MwStop® Bypass used?

The solution is relevant wherever a building must be able to discharge rainwater and wastewater during backflow conditions – without continuous pumping.

Combined and separate sewer systems
Rainwater and wastewater with gravity drainage during normal operation
Commercial properties, hotels, housing associations and municipal facilities
Private homes and low-lying properties
Large user groups where high operational reliability is essential

Underground car parksTechnical roomsHotelsHousing associationsFacilitiesLow-lying locationsCoastal areas / receiving water bodiesRainwater shaftsCombined sewer systemsRainwater sewer for park areas

Wird für das Projekt dimensioniert – nicht umgekehrt.

MwStop® Bypass in practice

Examples from material provided by Skybrudskompagniet show shaft installation, technical room, commissioning and service.

Protects against backflow from the public sewer system or receiving water body
Maintains discharge from the building and connected areas during an event
Reduces unnecessary energy consumption by using gravity drainage during normal operation