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Positive displacement compressors
Positive displacement (PD) compressors are the most common air compressors used in industry and commercial environments. These compressors work by pulling in successive volumes of air or gas and trapping them within a closed space. The chamber’s volume is then mechanically reduced, resulting in a steady and consistent pressure output. The highly pressurized gas is then discharged from the PD compressor into a system or storage tank.
A bicycle pump is a simple example of a positive displacement compressor. When you pull the handle, air is drawn into the cylinder. Pushing down compresses the air, which can then be pushed out.
From hands-on professionals to enthusiasts who demand consistent performance, PD compressors offer reliable compressed air in a wide range of applications, including automotive work, home improvement and industrial operations.
FAQs
Air can be compressed using two main methods — positive displacement and dynamic displacement compression. While positive displacement compressors are the most common type of compressor grouping, dynamic type compressors tend to be better for extremely high flow scenarios at lower pressures, such as the conditions in big industrial facilities or plants.
This type of compressor generates compressed air by rapidly rotating a high-speed impeller, accelerating the gas and increasing its velocity and kinetic energy. The result is a steady, large volume of built-up air pressure.
Positive displacement compressors are classified by how they move to squeeze air — reciprocating or rotating.
- A reciprocating compressor uses a piston moving in and out within a cylinder to draw in air, then compress it.
- A rotary compressor produces a continuous spinning motion that traps air in pockets. While the mechanism can vary, the result is a gas volume reduction, increasing its pressure and temperature.
From small trade shops to manufacturing facilities, PD compressors are versatile machines that provide numerous benefits in a wide range of applications, including:
- Reliable air flow: PD compressors deliver a consistent flow rate regardless of system pressure changes, ensuring dependable performance.
- High-pressure capabilities: These machines can achieve higher pressure ratios even when operating at lower speeds.
- Efficient operation: They maintain higher efficiency over a wide range of load conditions in both residential and commercial use.
- Low-maintenance design: The simpler design involves fewer moving parts, making these compressors easier to maintain and repair.
Yes — we sell a full line of positive displacement compressors. Options include rotary screw air compressors, known for their high efficiency and quiet operation. We also carry a wide range of reciprocating piston air compressors designed for durability and performance in heavy-duty industrial applications.
We invite you to browse our product descriptions, brochures and manuals to help you decide on the best positive displacement compressor for your unique business needs. We can also help you connect with an authorized dealer for guidance on all Quincy Compressor products.