G Series Progressive Cavity Single Screw Pump: Complete Guide to Stable, Gentle Transfer
G Series Single Screw Pump: Stable, Gentle Transfer for Challenging Media
When fluids contain solids, fibers, high viscosity or shear-sensitive ingredients, a conventional pump can create pulsation, turbulence and unnecessary product damage. The G Series single screw pump is designed for controlled, continuous transfer across demanding industrial applications.
How the G Series Works
The pump uses an eccentric screw rotor and a fixed stator. Their special geometry creates a series of sealed cavities. As the rotor turns, the medium moves axially at low internal velocity. This maintains a stable volume and pressure while avoiding eddies and agitation. The result is a steady, pulse-free flow that is gentle on the conveyed medium.
Key Performance Highlights
- Flow range: 0.8 to 150 m³/h
- Standard pressure stages: 6 or 12 bar
- Clean-water head: up to 60 m
- Medium temperature: below 80 °C; special designs up to 150 °C
- Viscosity range: 1 to 3,000,000 mPa·s
- Particle handling: up to 50 mm, depending on model
- Corrosive media compatibility: pH 0–14 with suitable materials
Built for Difficult Media
The G Series can handle media with or without solids, short fibers, self-lubricating or non-lubricating properties, adhesion, swelling behavior, erosion and toxicity hazards. Its gentle positive-displacement action is especially useful where stable dosing and low shear are important.
Typical Applications
From industrial and domestic sewage, sludge and filter-press feed to crude oil, oil-water mixtures, polymers, coal-water slurry, cement mortar, lime slurry, paints, sauces, starch, pulp, high-viscosity inks, adhesives and pharmaceutical ointments, the pump adapts to a wide range of processes.
Model Selection
The G20–G135 series covers compact dosing duties through high-capacity transfer. Select the model by required flow, pressure, speed, particle size and connection size. A variable-speed drive can further adjust capacity for accurate metering and process control.
Standards, Packing and Export Support
Standard designs are available to DIN, SMS, 3A, IDF and ISO requirements, with options aligned to GMP, QS and HACCP production environments. Pumps are protected in export wooden cases, with sea, air and express shipping available. Payment terms can be arranged by L/C, T/T, PayPal, Western Union or other agreed methods.
Explore the Product
For dimensions, configuration and inquiry details, visit the G Series progressive cavity single screw pump product page: https://blmmachinery.com/product/progressive-cavity-single-screw-pump/
G Series Progressive Cavity Single Screw Pump
The G Type single screw pump is engineered for high-viscosity, difficult-to-transfer and sensitive liquids. Its continuous, pulse-free delivery protects the medium while maintaining stable pressure, making it a dependable choice for food, chemical, environmental and general industrial processes.
Why Choose a Single Screw Pump?
The pump combines an eccentric screw rotor with a fixed stator. Their geometry forms sealed cavities that move the product axially at low internal velocity. This positive-displacement action avoids turbulence and agitation, delivers an even flow, and reduces shear damage. Capacity can be adjusted by changing rotation speed, supporting both transfer and metering duties.
Designed for Challenging Fluids
- Viscosities from 1 to 3,000,000 mPa·s
- Solid particles up to 50 mm, depending on model
- Short fibers and suspended matter
- Shear-sensitive, adhesive, swelling or aeration-prone media
- Self-lubricating or non-lubricating media
- Corrosive media, with suitable materials for pH 0–14
- Toxic or hazardous liquids with the appropriate sealing package
Performance at a Glance
| Range | Flow | Pressure | Typical inlet/outlet | Max. particle | Max. fiber |
|---|---|---|---|---|---|
| G20 | 0.8 m³/h | 6/12 bar | 25/25 mm | 1.5 mm | 25 mm |
| G30 | 5 m³/h | 6/12 bar | 50/40 mm | 2.5 mm | 35 mm |
| G40 | 12 m³/h | 6/12 bar | 80/65 mm | 3.8 mm | 45 mm |
| G60–G70 | 22–38 m³/h | 6/12 bar | 125/100–150/125 mm | 6–8 mm | 60–70 mm |
| G105 | 100 m³/h | 6/12 bar | 200/200 mm | 15 mm | 110 mm |
| G135 | 150 m³/h | 6/12 bar | 250/250 mm | 20 mm | 150 mm |
Standard clean-water head is up to 60 m. Normal medium temperature is below 80 °C, with special designs available up to 150 °C. Motor power, speed and NPSHr are matched to the selected model and operating point.
Application Range
Environmental protection: industrial and domestic sewage, sludge, turbid water, oil-water separators and plate-and-frame filter presses.
Petroleum and shipbuilding: crude oil, oil-water mixtures, oil residue, oil sewage, polymers and round-bottom cleaning systems.
Food and beverage: sauces, pulp, starch, distiller’s grains, grain residue and other viscous products.
Chemical, pharmaceutical and daily chemical: suspensions, greases, adhesives, colloidal pastes, ointments, emulsions and cosmetics.
Construction, mining, power and paper: cement mortar, lime slurry, paint, mine slurry, groundwater, coal-water slurry, high-viscosity ink, PVC paste and short-fiber pulp.
How to Select the Right Model
- Define required flow and discharge pressure.
- Confirm viscosity, temperature, solids, particle size and fiber length.
- Check installation method, inlet/outlet size and available motor power.
- Select wetted materials, seals and optional speed control for the medium.
For an accurate recommendation, send us the medium name, viscosity, temperature, flow rate, pressure, solids content, installation method and working hours.
Standards, Quality and Export Service
Designs can be supplied to DIN, SMS, 3A, IDF and ISO requirements, with options for GMP, QS and HACCP environments. Each pump is protected in an export wooden case. Sea, air and express shipping are available, with L/C, T/T, PayPal, Western Union or other agreed payment terms.
Request a Pump Recommendation
Buyer FAQ
What information is needed for selection? Provide the liquid name, viscosity, temperature, flow rate, discharge pressure, solids and fiber size, installation method and operating hours.
Can the pump handle abrasive or corrosive media? Yes, the G Series can be configured for erosive, adhesive and corrosive media. Wetted materials, rotor/stator elastomer and mechanical seal must be selected against the actual chemistry.
How is flow controlled? The pump delivers a constant positive-displacement flow. A variable-frequency drive can adjust rotor speed for capacity control and metering.
What should be checked before commissioning? Confirm correct rotation, adequate suction conditions, open valves, flooded or primed suction, compatible lubrication and that the pump is never operated dry.
Send your process data to BLM Machinery for a model recommendation, drawing, quotation and export delivery plan.Explore the full product details at Progressive Cavity Single Screw Pump. Contact BLM Machinery for model selection, customization and a quotation tailored to your process.
