In pneumatic control system why water is not used as medium
Answers
Pneumatic system is a compressed system.
Moisture in compressed air used in a manufacturing plant causes problems in the operation of pneumatic systems, solenoid valves and air motors and can adversely affect the process or product being manufactured. For many years, problems from moisture in compressed air lines were simply tolerated as unavoidable.
Moisture:
Causes rust and increased wear of moving parts in production equipment as it washes away lubrication
Can adversely affect the color, adherence, and finish of paint applied by compressed air
Can jeopardize process industries where many operations are dependent upon the proper functioning of pneumatic controls. The malfunctioning of these controls due to rust, scale, and clogged orifices can result in damage to product or in costly shutdowns
Can freeze in control lines in cold weather, which may cause faulty operation of controls
Causes corrosion of air or gas operated instruments, giving false readings, interrupting or shutting down plant processes.