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Heavy Duty Flap Valve Pump | SANDPIPER

Heavy Duty Flap Pumps

Engineered for the Most Demanding Solids-Handling Applications

When your application involves large, abrasive, or fast-settling solids, you need a pump that won’t clog or wear out quickly. SANDPIPER’s Heavy Duty Flap Pumps, available in both metallic and non-metallic models, are built to move even the toughest fluids with confidence and control.

These air-operated double-diaphragm (AODD) pumps are designed with a full flow-through, bottom-discharge design and swing-style flap valves that pass solids up to 3" in diameter, keeping your system running by reducing clogs and protecting components.

Key Features:

Sizes: 1 - 4" sizes (25 - 102 mm)

Flow: 70 - 310 gpm (265 - 1173 lpm)

Solids Handling: 1 - 3” (25 - 76 mm)

Construction: Aluminum, Cast Iron, Stainless Steel, Polypropylene

Elastomers: (Diaphragms & Flaps) Nitrile, Neoprene, Hytrel®, Santoprene®, Fluorocarbon, EPDM, Urethane

Bottom-discharge porting clears solids efficiently, preventing buildup and wear

Dry prime suction lift up to 24 ft., 5% higher than typical ball valve pumps

Quick access to serviceable components for faster maintenance and less downtime

ESADS+Plus air distribution system allows easy in-line maintenance

What Makes Flap Pumps Different?

Unlike standard ball valve pumps, flap valves create a more direct path for challenging materials to flow. This makes Heavy Duty Flap Pumps especially effective when:

Solids are too large for ball valves

Material settles quickly or becomes compacted

You need vertical lift or long suction lines

You want fewer wear parts exposed to abrasive slurries

Case Study: See How a Gas Supplier Handled Thick Slurry in Acetylene Wastewater Processing

Explore how a SANDPIPER Heavy Duty Flap Valve Pump handled lime slurry with hard particulate and demanding discharge conditions without clogging or constant maintenance.

Metallic vs. Non-Metallic Models

Metallic Pumps (Aluminum, Cast Iron, Stainless Steel): Best for rugged industrial environments where abrasion or impact resistance is key

Non-Metallic Pumps (Polypropylene): Best for chemical compatibility, corrosion resistance, and lighter-weight installations

All models feature all-bolted construction for leak-free performance and are backed by SANDPIPER’s commitment to long-term reliability. No matter which material you choose, you’ll get long-lasting performance, simplified maintenance, and fewer surprises on the job.

Explore Our Heavy Duty Flap Pumps

SANDPIPER AODD pumps deliver industry-leading durability and performance. Contact a local distributor to find your heavy duty flap pump solution.