Three function automatic air valve for sewage in stainless steel AISI 316 Mod. SCS 2" - PN 16

The air valve guarantees the proper  operation of sewage  lines allowing the entrance of a large quantity of air quantity in case of pipe bursting or draining phases,  the release  of air pockets  during working  conditions and the discharge during  pipe filling phases.

Construction and  advantages

  • Lower body designed  with strongly  sloped walls to avoid  grease  and/or   other   material   deposit.
  • Upper  body  containing the  air release device  in stainless steel  A S  316 which is protected against projections, during  rapid  filling phases by an  s.s. diffuser.
  • Mobile block including a shaft  and  a large  float, both in stainless steel A S  316, placed  on the lower body and  connected to the air release mechanism and to the main orifice obturator.
  • Drainage valve  for chamber control  and  draining.
  • Maintenance can  be  easily  performed from the  top without  removing   the  air  valve  from  the  pipe.
  • Evacuation bend  suitable for flooded environments with 1" threaded outlet.


Operating principle

  1. Discharge of large volumes of air
    During pipe  filling it is necessary to discharge as much air as water flowing in.
  2. Entrance of large volumes of air
    During pipeline  draining  or bursting  phases it is necessary to bring  in as much  air as the quantity  of out-flowing  water  to  avoid  vacuum conditions.
  3. Air release during working conditions
    During operation, an air pocket   accumulates in the upper  part of the valve body, little by little it is compressed and its pressure arrives  at water pressure, its volume increases  pushing water  downwards. Following Archimedes's principle the float, no longer sustained by water thrust, will drop freeing the nozzle  hole helping the release of the air pocket,  while the upper  disk closes the  main office due to internal pressure.

For air flow performances of SCS 2" please refer to the chart depicted on the next page.

Working conditions
Waste water 70 oc/ 1
58 oF Max; Maximum pressure 16 bar/ 232 psi; Minimum pressure 0,35 bar/ 5.2 psi.

Technical features
Lower body and upper body entirely made in stainless steel AISI 316 passivated
Obturator in polypropylene
Nozzle and gasket holder in stainless steel  AISI 316
Float and  rod  in stainless steel AISI 316
Gaskets in NBR
Sealing seat in stainless steel AISI 304 / AISI 316
Drainage valve in galvanized brass or stainless steel
AISI 316