Progressive Cavity Liquid Feed Pump

The Progressive Cavity Liquid Feed Pump is a positive displacement pump designed for controlled transfer of liquid feed, feed slurry, water-feed mixtures and other viscous or solids-containing media used in commercial livestock production.

The pump operates with a helical rotor rotating inside an elastomer stator. This geometry forms sealed cavities that progress continuously from the suction side to the discharge side, producing a steady, low-pulsation flow with comparatively gentle handling of the pumped material.

Progressive cavity technology is particularly suitable for pig liquid feeding systems because it can handle media ranging from relatively fluid mixtures to more viscous and heterogeneous feed suspensions. It can also accommodate certain solids and fibrous ingredients when the pump size, rotor-stator geometry and system design are selected correctly.

The pump can be installed between mixing tanks, storage tanks, rinse tanks, distribution manifolds and feeding pipelines. Flow rate, pressure, motor power, wetted materials, seals and connection standards can be configured according to project requirements.

• Low-Pulsation Conveying: Progressive cavities provide smooth and nearly continuous flow, helping maintain stable feed transfer through long distribution pipelines.
• Suitable for Viscous Media: Handles liquid feed mixtures, slurries and other media with varying viscosity more effectively than many conventional centrifugal pump designs.
• Gentle Product Handling: Low-shear pumping helps preserve the physical structure of sensitive or heterogeneous feed mixtures.
• Solids Handling Capability: Properly configured pumps can transport feed mixtures containing suspended particles and fibrous ingredients.
• Self-Priming Capability: Progressive cavity technology provides strong suction performance for suitable system layouts.
• Speed-Proportional Flow: Pump output can be adjusted by changing rotational speed, making the technology suitable for controlled transfer and dosing applications.
• Reversible Operation: Suitable designs can operate in either direction when required by system engineering.
• Compact Installation: Monobloc and compact pump configurations reduce required equipment-room space and simplify integration into liquid feed kitchens.
• Corrosion-Resistant Options: Stainless steel wetted components and multiple elastomer selections are available for demanding liquid feed environments.
• Easy System Integration: The pump can be connected with mixing tanks, valves, flow meters, pressure sensors, PLC systems and farm feeding computers.

• Drive Motor: Provides controlled rotational power to the pump.
• Gearbox: Reduces motor speed and delivers the torque required by the rotor-stator pumping unit.
• Drive Shaft: Transfers rotational movement from the drive assembly to the rotor.
• Coupling Rod / Joint Assembly: Accommodates the eccentric rotational movement of the helical rotor.
• Helical Rotor: Precision metal component that rotates eccentrically inside the stator.
• Elastomer Stator: Forms sealed progressive cavities together with the rotor.
• Suction Housing: Receives the liquid feed from the mixing tank or upstream pipeline.
• Discharge Connection: Transfers pumped feed into the downstream distribution circuit.
• Mechanical Seal: Prevents leakage around the drive shaft and is selected according to medium and cleaning requirements.
• Base Frame: Provides rigid support and alignment for the complete pump and drive assembly.

The progressing cavity pump uses a helically shaped metal rotor operating inside a matching elastomer stator. The rotor and stator geometry creates a sequence of sealed cavities along the pumping axis.

As the rotor turns, these cavities move progressively from the suction port toward the discharge port without significant change in volume. The liquid feed is therefore transported continuously through the pump rather than being accelerated by an impeller.

This positive displacement principle produces a flow rate that is closely related to pump speed. When used with a variable-frequency drive, the pump output can be adjusted to suit mixing, transfer, dosing or distribution requirements.

The smooth cavity movement also helps limit pulsation and excessive shear, which is useful when transporting heterogeneous feed mixtures or media containing suspended solids.

• Commercial pig liquid feeding systems
• Sow and gestation feeding installations
• Nursery liquid feed distribution
• Growing and finishing pig farms
• Liquid feed mixing and transfer stations
• Feed slurry circulation systems
• Liquid by-product handling
• Molasses and viscous ingredient transfer
• Feed additive dosing systems
• Rinse-water and process-liquid transfer
• New pig farm construction
• Existing liquid feeding system upgrades

• Required flow rate
• Operating pressure
• Motor power and gearbox ratio
• Fixed-speed or variable-speed drive
• Rotor geometry and surface treatment
• Stator elastomer selection
• Single or double mechanical seal
• Stainless steel wetted components
• Suction and discharge connection standards
• Base frame and motor orientation
• Pressure sensor and dry-running protection
• VFD and control cabinet integration
• PLC or farm management interface
• OEM configuration available upon request
• Designed according to liquid-feed characteristics and project requirements

Foundation: Install the pump on a rigid, level base or engineered steel frame to maintain correct alignment between the motor, gearbox and pump body.

Suction Piping: Keep the suction line as short and unrestricted as practical. Pipe diameter should be selected to limit excessive inlet losses, particularly when pumping viscous feed mixtures.

Flexible Connections: Flexible couplings or compensators can be used where required to prevent excessive piping stress from being transferred to the pump housing.

Dry-Running Protection: Progressive cavity pumps should not be operated dry because the pumped liquid normally lubricates and cools the rotor-stator interface. Suitable level or dry-running protection is recommended.

Pressure Protection: A pressure sensor, relief arrangement or compatible control logic should be considered to protect the pump and pipeline against excessive discharge pressure.

Cleaning: The pump and connected pipelines should be flushed according to the farm hygiene program. Cleaning procedures must be compatible with the selected elastomer and seal materials.

Routine Maintenance: Periodically inspect the rotor, stator, mechanical seal, drive joints, bearings, gearbox and connection bolts. Wear intervals depend on feed composition, solids content, operating pressure and pump speed.

In a typical commercial pig liquid feeding system, the progressive cavity pump is installed downstream of the mixing tank. After the feed recipe is prepared, the pump transfers the mixture into the main distribution line and supplies the feeding valves located throughout the livestock house.

For systems handling thick or heterogeneous feed, pump selection can be optimized by matching rotor-stator geometry, rotational speed, inlet arrangement and pipeline diameter to the expected viscosity and solids content.

Multiple pumps can also be arranged for separate feed circuits, mixing tanks or production areas in large pig production complexes where redundancy or independent feeding zones are required.

Q: Why use a progressive cavity pump for liquid feed?

A: Progressive cavity pumps provide steady, low-pulsation flow and can handle viscous, heterogeneous and solids-containing media, making them suitable for many pig liquid feeding applications.

Q: Can the pump handle feed containing solids?

A: Yes, suitable configurations can transport suspended particles and fibrous ingredients. Maximum particle size depends on pump geometry and project requirements.

Q: Can the flow rate be adjusted?

A: Yes. Pump delivery is approximately proportional to rotational speed, so a variable-frequency drive can be used to control feed flow.

Q: Is the pump self-priming?

A: Progressive cavity pumps generally provide strong self-priming and suction performance, although the actual installation should still be designed to minimize inlet restrictions.

Q: Can the pump run dry?

A: Dry running should be avoided because the pumped medium normally lubricates and cools the rotor-stator interface. Dry-running protection is recommended.

Q: Can stainless steel wetted parts be supplied?

A: Yes. Stainless steel construction and multiple elastomer and seal options are available according to feed composition and hygiene requirements.

Q: Can the pump be integrated with an automatic liquid feeding controller?

A: Yes. Motor starters, variable-frequency drives, pressure sensors and PLC interfaces can be integrated according to the project control architecture.

Q: What information is required for pump selection?

A: Please provide required flow rate, pipeline length, elevation difference, feed viscosity, solids content, particle size, operating temperature, required pressure, connection size and electrical supply.