SANDPIPER HDF3M-HDF4M Metallic Heavy Duty Flap Valve Pumps are recommended for abrasive slurries, suspended and non-suspended solids and line-size solids requirements. All SANDPIPER® Heavy Duty Flap Valve Pumps are configured in bottom discharge porting arrangements and provide superior suction lift. Heavy Duty Flap Valve Pumps are thick wall constructed of Sand-Cast Aluminum, Cast Iron and Stainless Steel with elastomer, and TPE (thermal plastic elastomers) options in diaphragms and check valves. HDF pumps are enhanced with an extended wear package.

SANDPIPER HDF3M-HDF4M Metallic – Performance Curve


SANDPIPER HDF3M-HDF4M Metallic – Specifications

Port Size :
3″ 150# ANSI Flange
4” 150# ANSI Flange
Capacity :
0 to 310 gpm (1173 lpm)
0 to 303 gpm (1147 lpm)
Air Distribution Valve :
No-lube, no-stall design
Solids-Handling :
Up to nearly 3″ (75 mm)
Heads Up To:
125 psi or 289 ft. of water (8.6 bar or 88 meters)
Displacement/Stroke :
1.60 gallons (6.08 liters)
1.15 gallons (4.37 liters)
Max Operating Pressure :
125 psi (8.6 bar)
Shipping Weight :
245 lbs (110 kg)
390 lbs (176 kg)

Features and Benefits of the Heavy Duty Flap Valve Pumps

    • Line-size solids handling
      Flap valve versus ball valve pumps
      • Flap check valve pumps: A large flow area allows up to 3″/4″ line-size solids to pass directly through the pump. Additionally, bottom discharge porting allows settling solids to pass through the pump and not settle inside the pumping chamber, preventing damage and premature wear.
      • Ball check valve pumps: Much less flow area for solids to pass through. Large solids get stuck in the suction manifold and small solids can settle in the outer chamber–both issues affect pump performance.
    • Superior suction lift
      Flap valve versus ball valve pumps
      • Suction lift advantage: SANDPIPER’s flap valve design provides superior suction lift capabilities up to 24 ft in water. Diaphragm placement and flap valve seating combine to create a unit capable of suction lifts 15% greater than ball valve pumps.
      • Dry prime: These capabilities are from a dry prime, making the SANDPIPER flap valve pump an excellent solution for situations where limited choices are available for pump priming.



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