Vacuum and Pressure Handbook: Vacuum Accessories and Systems

Summary of Pressure Sequence The sequence of compressed air flow in a pneumatic system is shown again in Fig 28: * Air Compressor - outside air is compressed to a pressure higher than that of the atmosphere. * Air Line Conditioners - devices located at various points provide moisture removal, filtration, lubrication, etc. * Storage (optional)-compressed air generated by the compressor may be stored in a receiver tank for use on demand. * Pressure/Flow Controls - valves control the pressure reaching the actuator, hence the force it produces. Flow control valves determine actuator speeds. * Work Devices - the actual work effects are obtained by supplying air to actuators and other air-operated devices. At the end of the actuator's work cycle, the "used" air is returned to the atmosphere, either directly through a control valve or through devices designed to reduce exhaust noise or remove oil vapor. The Fig. 28 configuration shows how pneumatic power can be generated and tapped at will to provide a great variety of useful mechanical effects.