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McDonnell & Miller Flow Switches Flow switches perform the function of protecting the flow service of fluids. A flow switch monitors and controls the flow of air, steam or liquid through a pipeline. It sends a "trip signal" to the various devices in the system, such as a pump. The flow switch can signal the pump to turn on or to turn off. Some of the universal uses are for protecting the pump, for cooling-circuit protection and to indicate during too high or too low flow rate …