What do rotary screw compressors primarily deliver?

Rotary screw compressors are designed to provide a constant volume of compressed air while maintaining a specific pressure ratio. This means that as the compressor operates, it continues to draw in air and compress it at a relatively steady rate, ensuring a uniform output. The constant volume is crucial for applications that require consistent air pressure and flow, as it enhances efficiency and reliability in pneumatic systems.

The pressure ratio indicates the relationship between the inlet pressure and the discharge pressure, highlighting the compressor's ability to elevate the pressure of the incoming air to a desired higher level without significant fluctuations in volume. This characteristic of rotary screw compressors makes them particularly suitable for industrial applications, where stable performance is vital.

Other options might suggest varying volumes or pressure drops, which are not typical of rotary screw compressors. Instead, the design and operation of these compressors focus on delivering a consistent output to meet the demands of various pneumatic processes.