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intro 2 - A History of Control Systems History of Control...

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A History of Control Systems Steam Pressure and Temperature Controls : Boiler safety valve: excessive pressure in the boiler would exceed the weight on the valve top causing the valve to open and venting excess stream if the pressure did not exceed the weight, the valve did not open The weight on the valve top set the internal pressure Incubator temperature control: used a floater inserted into a vial of alcohol and mercury floater connected to a damper controlling a flame as heat increased, mercury expanded, damper closed, flame reduced as heat decreased, float descended, damper opened, flame increased (c) 2010 Farrokh Sharifi 31
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