1. Product Overview

The Industrial Stainless Steel Single Screw Pump is a robust positive displacement pump engineered for the transfer of high-viscosity, abrasive, and particulate-laden fluids across various industries. Constructed with high-quality stainless steel, this pump provides corrosion resistance, durability, and sanitary performance, making it ideal for food, chemical, pharmaceutical, and industrial processes.

Unlike centrifugal pumps that require high speeds and are sensitive to viscosity changes, the single screw pump operates on a progressive cavity principle, ensuring steady, pulsation-free flow, self-priming capability, and gentle handling of delicate fluids. Its industrial-grade design allows it to handle thick pastes, slurries, adhesives, and other challenging materials with consistent performance.

2. Product Structure and Design

The pump’s construction emphasizes durability, efficiency, and easy maintenance.

2.1 Main Components

1. Pump Body (Casing) – Made of stainless steel 304 or 316L, resistant to corrosion and suitable for both acidic and alkaline media.

2. Rotor – A single helical rotor made from hardened stainless steel, precision-machined to form sealed pumping cavities.

3. Stator – Food-grade or industrial elastomer (NBR, EPDM, FKM), providing a tight seal between rotor and stator.

4. Drive Shaft and Bearings – Engineered to withstand radial and axial loads, ensuring smooth rotation and long service life.

5. Mechanical Seal or Lip Seal – Prevents leakage while maintaining sanitary and chemical compatibility.

6. Drive Unit – Can be direct-driven, gear-reduced, or inverter-controlled for variable flow.

2.2 Working Principle

The single screw pump works on the progressive cavity principle:

• As the rotor rotates eccentrically within the stator, a series of sealed cavities forms between them.

• These cavities move fluid from the suction side to the discharge side, providing continuous, non-pulsating flow.

• The pump can handle fluids with solids, fibers, or high viscosity, without shear or damage.

2.3 Advantages of the Design

• Consistent flow despite viscosity changes

• Self-priming for easy startup

• Handles abrasive or particulate materials without clogging

• Sanitary and hygienic options available for food and pharmaceutical industries

3. Technical Parameters

Customization available for higher viscosity, high-temperature fluids, and abrasive slurry applications.

4. Key Features and Advantages

1. Industrial-Grade Construction – Stainless steel body and rotor ensure durability and corrosion resistance.

2. Wide Viscosity Range – Capable of handling liquids from water-like consistency to thick pastes exceeding 500,000 mPa·s.

3. Gentle Pumping Action – Minimizes shear, preserving product integrity for sensitive fluids.

4. Continuous Flow with Minimal Pulsation – Ideal for precise dosing, chemical injection, or feeding filter presses.

5. Self-Priming Capability – Pumps liquids from dry suction or partially filled tanks.

6. Reversible Flow Option – Useful for backflushing, cleaning, or recirculation.

7. Low Maintenance – Modular design allows quick replacement of rotor, stator, or mechanical seal.

8. Energy Efficient – Lower power consumption than equivalent gear or diaphragm pumps.

9. Sanitary and Food-Grade Options – Compliant with FDA, 3A, and EHEDG standards.

5. Industrial Applications

5.1 Food and Beverage

• Viscous sauces, chocolate, peanut butter, fruit pastes

• Dairy products – milk, cream, yogurt, cheese slurry

• Ensures sanitary operation with minimal product damage

5.2 Chemical and Petrochemical

• Resins, adhesives, polymers, inks, and coatings

• Capable of transferring abrasive or particulate-laden fluids

• Handles chemicals with pH extremes or high temperature

5.3 Pharmaceutical and Cosmetic

• Ointments, gels, creams, lotions

• Gentle pumping avoids aeration and preserves consistency

• CIP/SIP compatibility ensures high hygiene standards

5.4 Environmental and Wastewater

• Sludge, slurry, and bio-waste transfer

• Resistant to clogging and abrasive solids

• Suitable for filter press feeding and dewatering processes

5.5 Heavy Industry

• Lubricants, oils, and semi-solid fuel transfer

• High-pressure capabilities allow efficient long-distance transfer

6. Operating Instructions

6.1 Installation

• Mount the pump on a stable, vibration-free base

• Align motor and pump shafts to avoid premature bearing wear

• Install flexible connections for suction and discharge to absorb misalignment

6.2 Startup

1. Fill suction line and pump casing with liquid to avoid dry running

2. Start motor at low speed and gradually increase to desired operating speed

3. Monitor for leaks, vibration, and unusual noise

4. Ensure pressure and flow are within design limits

6.3 Operation

• Avoid sudden start-stop sequences to reduce stress on rotor and stator

• Maintain steady supply of fluid; air entrainment can reduce performance

• Use heating jackets for viscous or temperature-sensitive materials

• Adjust speed with inverter or gear reduction to match process requirements

6.4 Shutdown

• Close discharge valves

• Stop motor and flush the pump with water or cleaning solution

• Clean and inspect seals and stator for wear

7. Maintenance and Cleaning

Daily:

• Flush with water or mild cleaning solution

• Wipe exterior surfaces and inspect for leaks

Periodic:

• Inspect rotor and stator for wear and replace if needed

• Lubricate bearings and check coupling alignment

• Inspect mechanical seals and replace if damaged

Tips:

• Use food-grade lubricants for sanitary pumps

• Avoid dry running beyond 30 seconds to prolong seal life

8. Troubleshooting Guide

9. Safety Precautions

• Never operate pump without fluid in suction line

• Do not exceed maximum pressure or speed

• Use protective guards for rotating parts

• Follow local electrical and safety codes

10. Certifications and Compliance

• Material: Stainless Steel 304 / 316L, FDA or food-grade elastomers

• Standards: ISO9001, CE, EHEDG, 3A sanitary standard

• Optional ATEX certification for explosion-proof applications

11. Customization Options

12. Advantages Summary

• Handles extremely viscous or abrasive fluids

• Gentle pumping preserves delicate materials

• Compact and modular design for easy maintenance

• Self-priming and reversible operation

• Sanitary options for food, beverage, and pharmaceutical applications

• Energy-efficient compared to conventional gear or diaphragm pumps

13. Frequently Asked Questions (FAQ)

Q1. What is the maximum viscosity the pump can handle?
A1. Up to 500,000 mPa·s, depending on speed and configuration.

Q2. Can it pump abrasive slurry?
A2. Yes, the pump is designed for slurry with solid content, with minimal wear on rotor and stator.

Q3. Is the pump suitable for food and beverage use?
A3. Yes, with 304/316L stainless steel and food-grade elastomers, it meets sanitary standards.

Q4. Can it operate at high temperatures?
A4. Standard models handle -10°C to 150°C, with customized high-temperature options available.

Q5. Does the pump require priming?
A5. It is self-priming for most applications but pre-filling is recommended for very viscous fluids.

Q6. Can it handle products with fibers or particles?
A6. Yes, up to 5–10 mm solid particles, depending on stator and rotor configuration.

Q7. How often should maintenance be performed?
A7. Rotor and stator inspection every 3–6 months, seals every 2–3 months, and bearings every 6 months.

14. Conclusion

The Industrial Stainless Steel Single Screw Pump is a reliable, versatile, and durable solution for transferring viscous, abrasive, or particulate-laden fluids. With its robust stainless steel construction, gentle pumping mechanism, and sanitary options, it is suitable for industrial, food, chemical, and pharmaceutical applications. Its low-maintenance design, self-priming capability, and customizable options make it an essential pump for demanding processes, ensuring stable flow, energy efficiency, and long service life.