SANDPIPER HDF3 / HDF4 3" & 4" Metallic Heavy-Duty AODD Flap Valve Pumps

The SANDPIPER HDF3 and HDF4 are 3″ (80 mm) and 4″ (100 mm) metallic, heavy-duty air-operated double-diaphragm (AODD) flap valve pumps. Thick wall-constructed of sand-casted aluminum, cast iron, or stainless steel, the platform is engineered for line-size solids handling and superior suction lift in tough industrial service.

The flap valve geometry passes solids up to nearly 3″ (75 mm) directly through the pump and provides up to 24 ft of suction lift in water — about 15% greater than ball valve pumps — from a dry prime. Both sizes ship with 150# ANSI flanged ports.

Service Manuals & Data Sheets — Material Variants

The HDF3 / HDF4 family ships in three material constructions. Use the manual and data sheet that match your pump’s wetted-parts material:

Aluminum — Service Manual · Data Sheet
Cast Iron — Service Manual · Data Sheet
Stainless Steel — Service Manual · Data Sheet

Line-size solids handling up to nearly 3″ (75 mm) — large flow area passes solids directly through the pump
Bottom-discharge porting — settling solids pass through instead of accumulating in the chamber
Suction lift up to 24 ft of water — ~15% greater than ball valve pumps
Dry-prime capability
Thick-wall, sand-casted construction in aluminum, cast iron, or stainless steel
No-lube, no-stall air distribution valve
Capacity: aluminum 0–310 gpm (1,173 lpm); cast iron 0–303 gpm (1,147 lpm)
Heads up to 125 psi or 289 ft of water (8.6 bar / 88 m)
Displacement/stroke: aluminum 1.60 gal (6.08 L); cast iron 1.15 gal (4.37 L)
HDF3 3″ 150# ANSI Flange or HDF4 4″ 150# ANSI Flange