Screw Pump

Common accessories

Progressive Cavity Pump stator

Progressive Cavity Pump rotor

Progressive Cavity Pump connecting rod

Progressive Cavity Pump drive shaft

Progressive Cavity Pump universal joint assembly

Mechanical seal/filler seal

Choose the Progressive Cavity Pump speed according to the abrasion of the medium

How Screw Pumps Work

The fundamental principle behind screw pumps is relatively straightforward. The screw(s) rotate within a casing, and as they turn, they push the fluid along the length of the pump. This process is particularly effective for handling thick, viscous, or abrasive fluids that would be challenging for other types of pumps. The design of the screw pump allows for a consistent and smooth flow, which is beneficial for applications requiring precise control over fluid delivery.

Types of Screw Pumps

Screw pumps come in several different types, each suited for specific applications and fluid characteristics. Here are the main types:

1. Single-Screw Pumps

Also known as progressive cavity pumps, single-screw pumps feature one helical screw inside a cylindrical stator. As the screw rotates, it moves the fluid along the screw’s axis. These pumps are well-suited for handling a variety of fluids, including those that are highly viscous or contain solids. They are commonly used in the oil and gas industry, wastewater treatment, and food processing. 

2. Twin-Screw Pumps

Twin-screw pumps have two intermeshing screws that rotate within a cylindrical housing. The screws are usually positioned in such a way that they form a series of sealed cavities which transport the fluid. Twin-screw pumps offer high efficiency and are capable of handling high flow rates with low pulsation. They are widely used in the chemical, pharmaceutical, and petrochemical industries for pumping both liquids and slurries. 

3. Triple-Screw Pumps

Triple-screw pumps feature three interlocking screws: one drives screw and two idler screws. This design provides balanced loading and minimizes vibrations, making these pumps ideal for high-pressure applications. They are often used in hydraulic systems, lubrication systems, and as fuel pumps in automotive applications. 

4. Multi-Screw Pumps

Multi-screw pumps use more than three screws arranged in a way that optimizes performance for specific tasks. These pumps can handle large volumes of fluids and are designed to operate under high pressure. They are less common than single, twin, or triple-screw pumps but are used in specialized applications where high capacity and efficiency are required.

Applications of Screw Pumps

Screw pumps are versatile and find applications across various industries. They are employed in:

Oil and Gas Industry: For transporting crude oil, refined products, and slurries.

Chemical and Pharmaceutical Industries: For handling corrosive, viscous, or delicate fluids.

Food Processing: For transferring ingredients and finished products with minimal shear.

Water and Wastewater Treatment: For pumping sludge and other thick liquids.

Advantages of Screw Pumps

Smooth and Continuous Flow: They provide a consistent flow rate with minimal pulsation.

Versatility: Capable of handling a wide range of viscosities and fluid types.

Low Shear: Gentle on fluids, making them suitable for sensitive or shear-sensitive liquids.

Self-Priming: Many screw pumps can prime themselves, which is advantageous for operations requiring frequent starts and stops.

Conclusion

Screw pumps are a crucial component in various industrial applications due to their ability to handle challenging fluids and provide reliable performance. Understanding the different types of screw pumps and their specific applications can help in selecting the right pump for a given task, ensuring efficient and effective operation.