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  2. Regulator (automatic control) - Wikipedia

    en.wikipedia.org/wiki/Regulator_(automatic_control)

    In automatic control, a regulator is a device which has the function of maintaining a designated characteristic. It performs the activity of managing or maintaining a ...

  3. Flow control valve - Wikipedia

    en.wikipedia.org/wiki/Flow_control_valve

    Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them. Automatic control valves include pressure reducing valves , flow control valves, back-pressure sustaining valves, altitude valves , and relief valves .

  4. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  5. How Much Is Amazon Prime and Is It Worth It? - AOL

    www.aol.com/finance/much-amazon-prime-worth...

    Amazon also offers a discounted Prime membership for people who quality for EBT and government assistance benefits. Once proof of eligibility is established, the monthly fee is $6.99, plus tax ...

  6. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    Air pressure was used for generating the controller output, and also for powering process modulating devices such as diaphragm-operated control valves. They were simple low maintenance devices that operated well in harsh industrial environments and did not present explosion risks in hazardous locations .

  7. Our Top-Tested Vacuum Is Majorly Discounted on Amazon ... - AOL

    www.aol.com/lifestyle/amazon-officially...

    Amazon's Prime Early Access Sale is happening now (Oct. 11-12, 2022) with Prime Day vacuum deals on upright, stick and robot vacuums from Dyson, Shark and more.