Air Release

RBXc Air Release Valves

Vent-O-Mat Series RBX c

The original “Anti-Shock” & “Anti-Surge” air release and vacuum break valves for water, sewage, and effluent pipelines in FUSION BONDED EPOXY POWDER COATED ductile iron.

Vent-O-Mat Advantages & Key Features

  • High capacity air discharge during pipeline filling
  • High volume air intake for vacuum break purposes, both during draining of water pipelines and/or column separations
  • Independent third-party tested
  • Controlled pressurized air discharge releases air when pipelines are fully-charged
  • Surge relief prevents pipeline bursts during pump trip & rapid pipeline filling
  • Products comply with NSF/ANSI Standard 61

Available Configurations

  • Standard – 4 functions
  • Biased
  • Flanged/Threaded Outlet


  • RBXc


  • Function - Anit-shock Close-up

  • Function - Anti-shock

  • Function - Vacuum Break

  • Function - Pressurized Air Release

  • Function - Filling of a pipeline

  • Vent-O-Mat - How it works


  • Size Range

    1" (25mm) to 12" (300mm)

  • Temperature

    -40degF to 176degF

  • Max. Operating Pressure

    Up to 1450psi (100bar) depending on size

  • Min. Operating Pressure


  • Flange Connection

    ASME B-16.5

  • Flange Drilling

    ANSI 150#, ANSI 300#, ANSI 600#, ANSI 900#

  • Body Material

    Fusion Bonded Epoxy Powdercoated Ductile Iron

  • Flange Material

    Fusion Bonded Epoxy Powdercoated Ductile Iron

  • Top Cover

    Fusion Bonded Epoxy Powdercoated Mild Steel

  • Float Material

    High Density Polyethylene (solid)

  • Bleed Port


  • O-Rings & Nozzle Seat




  • VENT-O-MAT RBXc English

Engineering Specifications

  • Vent-O-Mat RBXc English

Installation, Operation & Maintenance Manuals