Purchasing 7.5 kw Air Compressor: Screw or Piston Type?

7.5 kw air compressor is widely used in daily life and small projects. So, should you choose the screw type or the piston type? This may be something that needs to be considered.

Now let’s see how they differ.

The Difference Between Screw Air Compressor and Piston

If you are looking for a 7.5 kW air compressor, one crucial decision is choosing between a screw compressor and a piston compressor. Let’s explore the key differences between these two types:

Screw Air Compressor

Utilizes a rotary mechanism with two interlocking helical screws to compress air.

Offers continuous operation with minimal vibration and noise levels.

Requires less maintenance due to fewer moving parts, resulting in higher reliability.

Well-suited for applications with a consistent and high demand for compressed air, such as industrial manufacturing and automotive plants.

Piston Air Compressor

Relies on reciprocating pistons within cylinders to compress air.

Operates intermittently with noticeable vibration and noise during the compression process.

Requires more frequent maintenance due to the wear and tear on moving parts, such as piston rings and valves.

Ideal for applications with varying air demand and lower duty cycles, such as workshops, small businesses, and hobbyist use.

Screw compressors are preferred for continuous and high-demand applications due to their reliability, efficiency, and lower maintenance needs.

On the other hand, piston compressors are suitable for intermittent use and environments with fluctuating air demand, offering a cost-effective solution for smaller-scale operations.

Differences in Air Output, Stability, and Durability

When deciding between a screw or piston type air compressor for your 7.5 kW needs, it’s essential to understand the differences in air output, stability, and durability.

Air Output (FAD)

Screw compressors typically provide a more consistent and higher volume of compressed air compared to piston compressors. They are good at continuous airflow and steady pressure output, making them suitable for applications with high air demand.

While piston compressors can provide sufficient airflow for many applications, their output may fluctuate more compared to screw compressors, especially during peak demand periods.


Screw compressors offer excellent stability in terms of airflow and pressure. Their design allows for smooth and continuous operation, resulting in minimal vibration and noise.

This stability ensures consistent performance over extended periods, ideal for industrial environments where precision and reliability are critical.

Piston compressors may exhibit more vibration and noise during operation due to the reciprocating motion of pistons.

In addition, the intermittent nature of their operation may lead to slightly less stable airflow compared to screw compressors.


With fewer moving parts and less wear and tear during operation, screw compressors typically require less maintenance and have a longer service life compared to piston compressors.

Piston compressors’ reciprocating motion of pistons and the associated wear on components such as piston rings and valves may result in more frequent maintenance requirements, and a slightly shorter lifespan.

Differences in Application Industries

Screw compressors and piston compressors are suitable for different industries. Although many 7.5k air compressors are piston type, screw type has also become popular in recent years.

Screw Type Compressors

Industrial Manufacturing

Screw compressors are commonly used in various industrial manufacturing processes, including automotive, aerospace, electronics, and metal fabrication.

They are preferred for their continuous and reliable operation, making them suitable for powering pneumatic tools and equipment used in production lines.

Food and Beverage Industry

Screw compressors are also widely utilized in the food and beverage industry for applications such as packaging, bottling, and conveying. Their oil-free options make them suitable for applications where air quality is critical, ensuring compliance with food safety standards.

Textile Industry

In the textile industry, screw compressors play a vital role in powering air jet looms, spinning machines, and other equipment requiring a consistent supply of compressed air.

Piston Type Compressors

Small Workshops and Garages

Piston compressors are commonly found in small workshops, garages, and DIY settings. They are ideal for intermittent or occasional use, such as inflating tires, powering pneumatic tools, and spray painting.

Small Construction Industry

Piston compressors are often used in the small construction industry for tasks like framing, roofing, and nailing. Their portability and versatility make them suitable for on-site applications where access to electricity may be limited.

Woodworking and Carpentry

Woodworking shops and carpentry businesses frequently use piston compressors for tasks such as operating nail guns, sanders, and pneumatic drills.

In summary, while screw compressors excel in continuous and heavy-duty industrial applications, piston compressors are more suitable for smaller-scale operations and intermittent usage scenarios.

Cost Compare of 7.5 KW Air Compressor

In actual use, for small air compressors, such as 7.5kw air compressors, both screw and piston types are very popular choices.

Therefore, the difference in their running costs will become the focus.

Purchase Cost

Typically, screw compressors have a higher initial purchase cost compared to piston compressors.

This is because screw compressors are more complex in design and offer advanced features such as variable speed control and energy efficiency.

Piston compressors generally have a lower initial purchase cost. They are simpler in construction and often come as a more economical option, especially for small-scale operations with limited budgets.

Usage Cost

Despite the higher initial investment, screw compressors tend to offer lower usage costs over time. They are more energy-efficient, resulting in reduced electricity consumption and lower operating expenses.

While piston compressors may have a lower upfront cost, they typically consume more energy during operation, leading to higher usage costs in the long run.

Electricity Cost

Screw compressors are known for their energy efficiency, especially when equipped with features like variable speed drive (VSD). By adjusting the motor speed to match the air demand, screw compressors minimize energy wastage and help lower electricity bills.

Piston compressors have a fixed speed motor and operate at full capacity regardless of the air demand, resulting in higher electricity consumption and increased electricity costs.


What is the VSD Compressor and How to Choose Correctly

VSD compressor is a cutting-edge technology that has gained significant traction in recent years.

These advanced compressors have revolutionized the way compressed air is generated, offering unmatched energy-saving capabilities, flexibility, and control.

The VSD compressor has become a game-changer in the field of air compression, powering the modern-day industry. But what exactly is a VSD compressor, and how do you choose the right one for your business?

Maintenance Cost

Screw compressors generally have lower maintenance costs compared to piston compressors. They have fewer moving parts and require less frequent maintenance intervals.

Additionally, advanced diagnostic systems in screw compressors help identify issues early, reducing the risk of costly repairs.

Piston compressors have more moving parts, including pistons, valves, and cylinders, which may require regular maintenance and replacement.

7.5 kw fixed speed rotary screw air compressor

Small Rotary Screw Air Compressor 10 hp 7.5 kw

Driven method : Fixed Speed Drive
Series: Rotary Screw Air Compressor
Gas Type: Air
Power: 7.5 kw (10 hp)
Pressure: 7/8/10/ 12 bar
Flow: 1.2/1.1/0.9/0.8 m3/min

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