Flap valve ensuring the protection of sewage network against reverse flow rate
and preventing from animals intrusions.

  • Version with or without counterweight (the counterweight is an assistance for opening), flanged or bolted mounting.
  • Body and flap in welded steel, with hot galvanized coating (stainless steel on request).
  • Shaft in stainless steel.
  • Bearings in polyacetal.
  • Tightness ensured by a replaceable sensitive lip seal in NBR.
  • Flap with adjustable positioning.
  • Mounting on horizontal pipeline.


  • Unpressurized sewage water networks,
  • Unpressurized rain water networks,
  • Free surface flow water networks.

Technical data

  • Range: DN 200 to 1200.
  • Maximum downstream water head (measure from bottom):

  - 6 mWH for DN200 to 600,
  - 3 mWH for DN700 to 1200.

  • Maximum temperature: from 1°C to +60°C.
  • Seating: leakage rate lower than 0,02 l/s per linear meter of seal perimeter.
  • Flange drilling according to standards EN 1092-2 and ISO 7005-2:

  - ISO PN 10 or 16 for DN 200 to 1200.