Flap Valve Diaphragm Pump

Flap Valve Diaphragm Pump for Slurries and Solids-Containing Fluids

OVELL flap valve diaphragm pumps are designed for demanding industrial fluid transfer applications involving high-viscosity liquids, slurries, suspended solids and larger particles. The flap valve configuration creates a wider flow passage than conventional ball valve diaphragm pumps, helping difficult media move through the pump with reduced risk of blockage.

Based on air operated double diaphragm pump technology, the pump combines strong solids-handling capability with self-priming, dry-running and variable flow control.

This makes the flap valve diaphragm pump suitable for applications where conventional AODD pumps may experience frequent valve blockage or restricted flow.

How Does a Flap Valve Diaphragm Pump Work?

A flap valve diaphragm pump uses compressed air to drive two flexible diaphragms in alternating suction and discharge strokes.

During each pumping cycle, flap-type check valves open and close to control fluid direction. Compared with traditional ball check valves, flap valves provide a larger unrestricted passage, allowing viscous fluids and solids-containing media to pass through more easily.

The pumped fluid remains separated from the compressed-air drive system by the diaphragms, supporting reliable fluid transfer across a wide range of industrial applications.

Advantages of a Flap Valve AODD Pump

Large Solids Handling

The wide flap valve opening allows larger solids and suspended particles to pass through the pump with less restriction.

Reduced Risk of Clogging

The simplified fluid path helps reduce blockage caused by fibrous materials, sludge, solids and thick process fluids.

High-Viscosity Fluid Capability

Flap valve diaphragm pumps are suitable for viscous fluids that may be difficult to transfer using conventional centrifugal or ball-valve diaphragm pumps.

Low Shear Fluid Transfer

The reciprocating diaphragm pumping principle provides gentle fluid movement and helps minimize excessive shear and agitation.

Self-Priming Operation

The pump can provide strong suction capability, making it suitable for transferring liquids from tanks, pits, drums and process vessels.

Dry-Running Capability

Air operated diaphragm pump technology can tolerate temporary dry running without mechanical-seal damage.

Typical Flap Valve Diaphragm Pump Applications

OVELL flap valve diaphragm pumps can be used for:

• Sludge transfer
• Wastewater treatment
• Mining slurry
• Ceramic slurry
• Paint and coatings
• Adhesives
• High-viscosity chemicals
• Food-processing waste
• Fibrous liquids
• Solids-containing process fluids
• Tank and pit emptying
• Filter press feeding
• Industrial wastewater
• Thick liquids and pastes

Flap Valve Pump vs Ball Valve Diaphragm Pump

A conventional AODD pump normally uses ball-type check valves. This design is effective for many standard liquids but may become restricted when handling large solids, stringy materials or highly viscous fluids.

A flap valve diaphragm pump uses hinged flap-type check valves instead of valve balls.

This provides:

• Larger flow passages
• Better solids handling
• Reduced restriction
• Lower clogging risk
• Improved performance with viscous fluids and slurries

For clean liquids and conventional chemical transfer, a ball valve AODD pump may be suitable.

For difficult media containing larger solids or high concentrations of suspended material, a flap valve diaphragm pump can provide a more suitable solution.

Flap Valve Pump for Wastewater and Sludge Transfer

Wastewater and sludge applications often contain solids, fibres, suspended particles and variable-viscosity fluids.

These conditions can cause conventional pumps to clog or lose performance.

The large flow passage of an OVELL flap valve diaphragm pump helps transfer sludge and solids-containing wastewater while maintaining the operating advantages of an air operated diaphragm pump.

Typical installations include wastewater treatment plants, sludge pits, settling tanks, industrial wastewater systems and filtration processes.

Selecting the Right Flap Valve Diaphragm Pump

When selecting a flap valve diaphragm pump, consider:

• Required flow rate
• Fluid viscosity
• Particle size
• Solids concentration
• Suction lift
• Discharge pressure
• Fluid temperature
• Chemical compatibility
• Pipeline diameter
• Pipe length
• Abrasiveness
• Required pump material

Pump wetted materials, diaphragm material and valve configuration should be selected according to the properties of the transferred fluid.

OVELL Flap Valve Diaphragm Pump Solutions

OVELL provides flap valve air operated diaphragm pump solutions for challenging industrial fluid transfer applications.

The combination of a wide solids passage, pneumatic operation and diaphragm pumping technology makes the pump suitable for transferring viscous fluids, slurries and solids-containing media where conventional pumping systems may experience blockage or excessive wear.

For pump selection, provide the fluid name, viscosity, solids content, maximum particle size, required flow rate, discharge pressure and operating conditions.

‍