ARO Flap Valve Air Operated Double Diaphragm Pump

PF20X-XXX-SXX-B 172 GPM (651 LPM)

Product Description

The ARO Flap Valve is a type of valve that is used to control the flow of fluids. It is a self-priming, air-operated valve that is designed for general fluid transfer. It can handle a wide variety of fluids, including clean, light viscosity to medium viscosity. It is rugged and reliable, making it a good choice for harsh environments. It is also ATEX certified, making it safe to use in potentially explosive atmospheres.


  • Able to handle 2″ semi-solids and 3/4′ solid materials.
  • Available in three different construction materials including Aluminum, Cast Iron or Stainless Steel with the option of Plated Steel or Stainless Steel hardware
  • Efficiency – Simul-Shift™ valve provides ultra-positive, reliable shift signal
  • Reliability – ARO’s patented ‘Unbalanced’ air valve ensures no-stall operation


  1. 66312 Air Line Connection Kit: contains Piggyback Filter / Regulator, pipe nipple & 5’ section of hose
  2. 67263 Continuous-Duty Muffler: Recommended for continuous-duty and high-flow applications. Features large expansion chamber, permitting cold exhaust air to exit pump.
  3. 94117 Air Motor Muffler
  4. 637369 Air Section Service Kit (for PF20R and PF20Y)
  5. 637421 Air Section Service Kit (for PF20A and PF20S)
  6. 637310-XX Fluid Section Service Kit


Pump Casing Materials
  • Aluminum
  • Cast Iron
  • Stainless Steel
Diaphragm Materials
  • Santoprene
  • Nitrile
  • PTFE w/ Santoprene backer
  • Viton


  • Water treatment
  • Pool and spa treatment
  • Industrial applications
  • Laboratory applications