In-Line Check Valve – Series EVR-MwStop

Our range of EVR-MwStop check valves ensures the availability of a suitable model for most applications. The EVR-MwStop provides back-flow protection in wastewater and stormwater piping systems and prevents emerging odors. Sizes up to DN1800.

The standard casing of the EVR-MwStop consists of 316 (1.4404) stainless steel. For sizes up to DN200 and mounting as part of a pipe, PVC/PE can be provided as an alternative.

The EVR-MwStop membrane is manufactured from EPDM.


EVR-MwStop Content-2

Product Features

  • Extremely low headloss
  • Suitable for most piping materials and sizes
  • Simple installation
  • Long lifetime
  • Maintenance-free
  • No mechanical parts
  • Self-cleaning


  • Backflow protection
  • Flushing
  • Odor Control

Our range of EVR-MwStop valves can be installed in various ways in any position from horizontal to vertical, full functionality is given.


Standard – EVR-MwStop
For Gradients > 2%

To ensure the full functionality of the EVR-MwStop, a minimum gradient of 2% is required in the standard version. The EPDM membrane of the EVR-MwStop opens up at a certain water pressure (water flow) and closes if this pressure falls below the normal level. The EVR-MwStop remains closed until the inlet water backlog reaches the trigger point. At the trigger point, the membrane snaps open, creating the controlled flushing process.

Soft – EVR-MwStop
For Low Gradients

For installation in pipes with a gradient of less than 2% (minimum 1% is required) the membrane of the EVR-MwStop consists of a more flexible material. This ensures that even in these situations, the flushing process removes the waste water, inclusive of residual deposits.

Contact 1.800.461.6331