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Two-stage screw air compressor is more expensive than single-stage screw air compressor due to several reasons. The two-stage screw air compressor is designed to achieve higher pressure ratios and is equipped with additional components to achieve this. This design and additional components result in higher manufacturing and maintenance costs, which contribute to the higher price of the two-stage screw air compressor.

One of the main reasons for the higher cost of the two-stage screw air compressor is the design complexity. Unlike the single-stage screw air compressor, the two-stage screw air compressor has two compression stages. This means that the air is compressed in two separate chambers, which requires a more intricate design and precision engineering. The additional components and complexity of the design result in higher manufacturing costs, which are passed on to the consumer in the form of a higher price.

Furthermore, the two-stage screw air compressor requires additional components such as intercoolers and aftercoolers to cool the air between the two compression stages. These components add to the overall cost of the compressor and also require additional maintenance and servicing. The intercoolers and aftercoolers need to be regularly cleaned and maintained to ensure optimal performance, which adds to the long-term cost of ownership of the two-stage screw air compressor.

In addition to the design complexity and additional components, the two-stage screw air compressor is also built to withstand higher pressure ratios. This requires the use of stronger and more durable materials, as well as more robust construction techniques. The higher pressure ratios also result in increased wear and tear on the compressor components, which leads to higher maintenance and repair costs over the lifespan of the compressor.

Another factor that contributes to the higher cost of the two-stage screw air compressor is the increased energy consumption. Due to the higher pressure ratios and additional components, the two-stage screw air compressor typically consumes more energy compared to the single-stage screw air compressor. This results in higher operating costs over the lifetime of the compressor, which adds to the overall cost of ownership.

In conclusion, the higher cost of the two-stage oil injected air compressor compared to the single-stage screw air compressor can be attributed to several factors. These include the design complexity, additional components, increased energy consumption, and higher maintenance and repair costs. While the initial investment in a two-stage screw air compressor may be higher, it is important to consider the long-term cost of ownership and the benefits of higher pressure ratios and increased performance. Ultimately, the decision to invest in a two-stage screw air compressor should be based on a thorough evaluation of the specific requirements and operating conditions of the application.