ANTI-VACUUM VALVES
   
 
 
   
 
Accumulated air can cause catastrophes to the pipeline systems. Generation of vacuum leads to pipeline implosion or pressure transients. The preventive course is use of efficient Air Release valves & use of Anti-Vacuum Valves at the critical locations of the pipeline that are prone to vacuum generation. The R & D Multiple’s Anti- Vacuum valves are designed & manufactured to be extremely responsive & sensitive to the pressure decrease in the line. They instantly allow the entry of sufficient quantity of air at the slight hint of the inception of vacuum & preclude the possibility of vacuum build–up.
   
  SALIENT FEATURES :
   
 
  • Size range: 150 to 400mm. Pressure ratings: PN10 / PN16 & PN24.
  • Material Options: C.I., S.G.I., C.S. (WCB) for Body & Cover, Bronze Dashpot & Seat Ring & Guide Bushes & SS Shaft, Pins, Links & levers.
  • Hydraulic Dashpot arrangement to eliminate slam in closing of the AVV.
  • Externally adjustable Counter-weight arrangement to set the closing torque.
  • Large cowl type covered valve body eliminating any possibility of internal assembly being tampered-with.
  • Provision for mounting of an isolating sluice valve & Air Release valve on the body of the AVV is given.
   
  SPECIAL FEATURES :
   
 
  • Large aero-dynamic flow passages ensuring quick entry of large volumes of air.
  • Resilient seat fixed into the Valve Body giving drop-tight shut-off during normal operation.
  • Critically balanced dashpot, cwt & disc assemblies ensuring that with slightest hint of vacuum formation in the pipeline, the disc opens to allow entry of large volume of air.
  • Sturdy, robust cast construction of the valve body & disc. Body provided with swirl busting ribs.
  • Non-Ferrous liner bush bearings provided for shaft & pins at all rubbing joints. This minimizes friction, enhances the availability of the valve & increases its service life.
   
   
   
   
 
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