​TWIN AIR THREE FUNCTIONS AIR VALVE

​The valve for automatic air release and air admission of pipelines - Thanks to its large cross-section and the very high ventilation speeds, the ERHARD TWIN-AIR air valve is ideal for use in larger pipe networks and guarantees safe pipe ventilation during the filling process, operational air release being in service and during the draining process. Not withstanding the high performance, the construction is compact and space-saving.

The ERHARD TWIN-AIR Air Valve has two nozzles. Air can first escape via both orifices in the pipe filling process which means high ventilation performance. Both orifices will be shut once the water level has reached the floating point of the balls. If air should however accumulate during ongoing operation, only the float ball of the small orifice will drop thus releasing the small valve until the air volume has escaped. The small orifice is being purged by a cleaning device with every switching action.
Technical Specifications
  • Body and body cover made of ductile cast iron EN-JS 1050
  • Body inside enamelled and outside epoxy, or
  • Body inside and outside epoxy.
  • Body cover: inside and outside EKB fusion bonded epoxy• Float ball for DN50 to DN100 made of multi-chamber GRP (optional of austenitic CrNi steel 1.4571).
  • Float ball for DN150 and DN200 made of austenitic CrNi steel (1.4571).
  • Float guide and float assembly for evacuation under pressure (made of austenitic CrNi steel 1.4571).
  • Body seat made of EPDM, W270.
  • Connecting bolts made of stainless steel A4.