High-Performance Screw Pump Solutions
Changyu’s G-type screw pump is a rotary positive displacement pump, commonly known as a single-screw pump or mono-pump, which conveys the medium through the interaction of an eccentric screw and a sleeve. Its core structure consists of an internal screw (rotor) with a large lead and high tooth height, and an external screw (stator) with a double-helix surface that meshes with the rotor’s helical grooves.
This design ensures that, during operation, the G-type screw pump maintains an appropriate clearance between the screws and between the screws and the sleeve walls, forming a continuous sealed chamber that facilitates the conveyance of liquids. It is particularly well-suited for handling high-viscosity fluids containing particles or fibres, and is widely used in the environmental protection, petroleum, and food industries.
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Rango de caudal: |
0m³/h~200m³/h |
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Rango de cabezas: |
60m~120m |
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Potencia del motor: |
0.55 kw ~ 37 kw |
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Velocidad: |
400r/min ~ 960r/min |
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Rango de temperatura medio: |
-20 °C a 150 °C |
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Materiales personalizables: |
cast iron /stainless steel |
What is a screw pump?
A screw pump is a positive-displacement pump that uses one or more precision-machined screws to transfer fluid through sealed cavities formed between the screw threads and the pump casing. As the screws rotate, fluid is conveyed smoothly from the suction port to the discharge port, producing a continuous, low-pulsation flow. At Bomba Changyu, screw pumps are engineered for handling high-viscosity, abrasive, and shear-sensitive media with reliable volumetric efficiency.
Due to their self-priming capability, stable pressure characteristics, and gentle fluid handling, Bomba Changyu screw pumps are widely used in chemical processing, wastewater treatment, petroleum transfer, marine applications, and industrial manufacturing. Compared with centrifugal pumps, screw pumps maintain consistent performance when transporting viscous liquids and provide accurate flow control under varying operating conditions.
How do screw pumps work？
A screw pump, also known as a progressive cavity pump or Archimedes screw pump in certain applications, operates on the principle of positive displacement fluid transfer. In a G-type screw pump, the rotating screw (rotor) moves inside a stator, creating a series of sealed cavities that continuously transport fluid from the suction side to the discharge side. Unlike centrifugal pumps, screw pumps rely on cavity movement rather than kinetic energy to move liquids.
Step 1: Fluid Intake Through Vacuum Formation
As the screw rotates, the volume of the sealed cavity near the inlet gradually increases. This expansion creates a low-pressure zone (vacuum effect) that draws liquid into the pump chamber without requiring external priming under normal operating conditions.
Step 2: Continuous Cavity Transfer
Once the fluid enters the sealed cavity, the rotation of the screw causes the cavity to move axially along the pump body. The fluid becomes trapped within these cavities and is transported smoothly toward the discharge end. This process ensures a continuous, low-pulsation flow, making screw pumps suitable for viscous and shear-sensitive media.
Step 3: Fluid Compression and Discharge
As the cavity approaches the outlet, its volume gradually decreases. The reduction in cavity volume compresses the fluid and forces it toward the discharge port, generating the required delivery pressure. Because the fluid is conveyed in enclosed chambers, backflow is minimized and volumetric efficiency remains high.
Working Principle Summary
En Bomba Changyu, screw pumps are designed around the positive displacement principle, where rotating screws create and move sealed cavities that continuously transfer fluid from inlet to outlet. The pump flow rate is directly proportional to rotational speed and remains largely unaffected by discharge pressure. This design enables stable flow, accurate metering, self-priming capability, and efficient handling of high-viscosity, abrasive, and solid-containing fluids across a wide range of industrial applications.
Screw Pump Types Available from Changyu Pump
As a professional screw pump manufacturer, Bomba Changyu offers a wide range of standard screw pump types designed for different fluids, operating conditions, and industrial applications. Our standard models are available for direct supply and can meet the requirements of most pumping systems. From low-viscosity liquids to highly viscous slurries, we provide reliable screw pump configurations for continuous industrial operation.
Browse our available screw pump types below.
Close-coupled cast-iron progressive cavity pump
- Flow: 0.5–150 m³/h (2.2–660 USGPM)
- Pressure: 0–4.8 MPa (0–700 psi)
- Equipped with a bearing housing to reduce axial load, extend service life, and withstand higher operating pressures.
- Suitable for a wide range of high-viscosity media and liquids containing solid particles.
Bearing-frame industrial screw pump
- Flow: 0.5–300 m³/h (2.2–1321 USGPM)
- Pressure: 0–2.4 MPa (0–348 psi)
- Suitable for a wide range of high-viscosity media and liquids containing solid particles.
- Equipped with a bearing housing to reduce axial load, extend service life, and improve pressure-bearing capacity.
Industrial stainless steel progressive cavity pump
- Flow: 0.5–150 m³/h (2.2–1321 USGPM)
- Pressure: 0–2.4 MPa (0–348 psi)
- Gentle conveying with low pulsation and smooth operation.
- Suitable for handling high-viscosity fluids and media containing solid particles.
Threaded cast iron screw pump
- Flow: 10–400 L/h
- Pressure: 0–2.4 MPa (0–348 psi)
- Metering accuracy of ±1%.
- Ideal for low-flow transfer of viscous materials.
- Can be equipped with a variable-speed drive for precise chemical dosing and metering applications.
Threaded stainless steel screw pump
- Flow: 0.5–50 m³/h (2.2–220 USGPM)
- Pressure: 0–1.2 MPa (0–174 psi)
- Available with multiple connection options, including flange, SMS, and sanitary clamp fittings.
- Designed for food, pharmaceutical, cosmetic, and biotechnology applications requiring high hygiene standards.
- Wetted surfaces are polished, dead-zone free, and easy to clean.
Sanitary food grade progressive cavity pump
- Flow: 0.5–50 m³/h (2.2–220 USGPM)
- Pressure: 0–2.4 MPa (0–348 psi)
- Available with multiple connection options, including flange, SMS, and sanitary clamp fittings.
- Suitable for transferring a wide range of products in food, pharmaceutical, cosmetic, and biotechnology industries.
- Polished wetted surfaces ensure easy cleaning, no dead zones, and excellent hygienic performance.
Open hopper progressive cavity pump
- Flow: 0.5–120 m³/h (2.2–528 USGPM)
- Pressure: 0–2.4 MPa (0–348 psi)
- Adjustable rectangular feed hopper with optional feeding chamber.
- Connecting rod with feed auger provides forced conveying of highly viscous and high-solids-content media.
Heavy-duty hopper feed screw pump
- Flow: 0.5–120 m³/h (2.2–528 USGPM)
- Pressure: 0–4.8 MPa (0–700 psi)
- Robust construction designed for demanding operating conditions.
- Suitable for conveying highly viscous, poorly flowing, and difficult-to-handle materials.
- Large tapered feed chamber and specially designed connecting rod provide stronger feeding force and improved material transport efficiency.
Vertical progressive cavity pump
- Flow: 0.5–140 m³/h (2.2–616 USGPM)
- Pressure: 0–2.4 MPa (0–348 psi)
- Features a bell-mouth stator design for excellent self-priming performance.
- Ideal for pumping media directly from drums, tanks, containers, and pits.
- Particularly suitable for confined spaces and applications where conventional pump installation is difficult.
In addition to our standard product lineup, Bomba Changyu can also manufacture customized screw pumps based on your specific process requirements. If your application requires special materials, unique dimensions, non-standard connections, or customized performance parameters, our engineering team can develop a tailored solution to match your project.
If you need a configuration that is not listed, contact Changyu Pump for customization options and technical support.
Correo electrónico: [email protected] Tel/WhatsApp: +86-13651913727
Advantages of Screw Pumps
Stable flow and pressure
G-type screw pumps provide stable flow and pressure output, making them suitable for applications requiring precise flow control.
Strong self-priming capability
The G-type screw pump possesses strong self-priming capability and can run dry to draw in liquid, making it suitable for applications where the working site is distant or the conditions are complex.
Wide range of applications
These pumps can handle a variety of high-viscosity media containing particles or fibres, such as slurry, sewage and foodstuffs.
Simple structure and easy maintenance
As the screw pump has a relatively simple structure, it is relatively easy to maintain. Furthermore, it experiences minimal wear and tear, resulting in a long service life.
Nota:
For screw pumps from widely used brands such as NETZSCH, SEEPEX, MONO, and Allweiler, we provide highly compatible replacement solutions for both complete pump units and spare parts. Whether for new project installations or existing equipment maintenance and upgrades, our products can be quickly matched and easily integrated, ensuring reliable operation while effectively reducing procurement and maintenance costs.
For further product details, please download our screw pump brochure
Industrial Applications of G Series Screw Pumps
The G series progressive cavity screw pump is engineered for handling high-viscosity, shear-sensitive, or abrasive media containing solids and fibers. Due to its positive displacement design and linear flow-to-speed relationship, it provides low-pulsation fluid transfer across diverse heavy-duty industries.
1. Environmental & Municipal Wastewater Treatment
Dewatering Feed: Smooth, low-pulsation feeding of concentrated sludge (90%–98% water content) to belt filter presses, plate-and-frame filter presses, and centrifuges.
Sludge Transfer: Reliable extraction and transfer of digester sludge and return activated sludge from tank bottoms.
Chemical Dosing: Precise, linear metering of high-viscosity polymers (PAM) and coagulants (PAC).
Waste Transport: Efficient conveyance of screening grit, scum, sand-water mixtures, and organic slurry for biogas feeding.
2. Oil & Gas Industry
Multiphase Transfer: Gathering and transporting crude oil mixed with water, gas, and abrasive sand, especially effective for heavy oil.
Drilling Mud: Circulation and transfer of drilling fluids containing bentonite and rock cuttings.
Additive Injection: Precise metering and injection of hydraulic fracturing fluids, gels, drag reducers, and proppants.
3. Chemical & Process Engineering
High-Viscosity Media: Stable transfer of resins, adhesives, paints, coatings, inks, rubber latex, and dyes.
Suspensions & Pastes: Handling polymer emulsions, titanium dioxide slurries, calcium carbonate slurries, lubricants, silicone, and detergents.
Reactor Processing: Reliable chemical dosing into reactors and stable discharge of highly viscous finished products.
4. Food, Beverage & Pharmaceuticals
Viscous Food Transfer: Gentle handling of tomato paste, fruit jam, peanut butter, chocolate, minced meat, honey, and syrups.
Solid-Laden Fluids: Low-shear conveying of yogurt with fruit pieces or sauces with seeds, preserving particle integrity without crushing.
Hygiene & Bio-Processing: Gentle transfer of yeast slurries, ointments, creams, and shear-sensitive cell culture media.
5. Mining & Metallurgy
Tailings & Concentrates: Transferring high-concentration, fast-settling ore tailings (iron, copper, gold) and abrasive flotation concentrates.
Corrosive Slurries: Handling highly alkaline red mud from alumina production (Bayer process) and acidic metallurgical pickling sludge.
6. Construction & Ceramics
Grouting & Mortar: On-site pumping and injection of cement mortar, putty paste, and fireproof coatings.
Civil Engineering: Pumping bentonite mud to the cutting face in tunnel shield tunneling operations.
Ceramic Slurries: Reliable transfer of clay slip, glaze materials, and gypsum plaster.
7. Pulp & Paper
Fiber Conveying: Low-shear transfer of medium-to-high concentration wood pulp and recycled paper pulp without damaging fibers.
Coating Kitchen: Smooth handling of calcium carbonate and kaolin clay coatings.
Chemical Recovery: Transferring highly corrosive black liquor and green liquor.
8. Agriculture & Biogas
Manure Handling: Transporting livestock manure containing heavy fiber and sand from collection pits to separators.
Digestate Transfer: Conveying biogas fermentation residues and high-density organic liquids.
For applications requiring custom parameters:
Recomendamos ponerse en contacto con Changyupump to configure a solution tailored to your specific media viscosity, solid content, temperature, flow rate, and pressure requirements. We provide comprehensive technical documentation and material selection guidance (Stator/Rotor options) to optimize your process.
¿Necesitas una respuesta rápida o un presupuesto personalizado? Nuestro equipo te responderá en un plazo de 24 horas con atención personalizada.
Correo electrónico: [email protected]
WhatsApp: +86-13651913727
Why Choose Changyu Pump
Elegir el adecuado screw pump supplier is not only about product specifications, but also about manufacturing capability, precise material control, and long-term reliability in highly viscous, abrasive, and shear-sensitive applications. Changyu Pump (G series) is a dedicated industrial pump manufacturer focusing on progressive cavity fluid transfer solutions for harsh working conditions.
With over 20 years of Fabricante de equipos originales (OEM)/ODM experience, Changyu Pump specializes in the design and production of heavy-duty industrial pumps, including progressive cavity screw pumps, slurry pumps, and centrifugal pumps. The G series is engineered for complex media such as high-viscosity sludges, polymer dosing chemicals, oil-water mixtures, and particle-heavy slurries, ensuring stable operation and low pulsation under continuous industrial duty.
All G series screw pumps are manufactured under strict quality control systems and certified to international industrial standards. By matching premium elastomeric stators (such as NBR, EPDM, and Viton) with precision-machined, wear-resistant metallic rotors, our designs eliminate fluid shearing and premature wear, ensuring operational stability in demanding processing environments.
Beyond standard products, Changyu Pump provides engineering-based customization, including tailored rotor/stator material selection, precise flow-to-speed calibration, temperature adaptation (up to +150°C), and high-pressure system integration (up to 20bar). This allows our screw pumps to be seamlessly integrated into municipal wastewater plants, oil fields, chemical process systems, and food processing facilities.
For customers requiring reliable progressive cavity pumping solutions, Changyu Pump delivers not just equipment, but application-oriented engineering support designed for long-term industrial performance.
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