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2. Pressure regulator - Wikipedia

   en.wikipedia.org/wiki/Pressure_regulator

   Diagram symbols for pressure reduction and back pressure regulators. The conceptual difference is mainly in which side the feedback is taken from. A pressure regulator is a valve that controls the pressure of a fluid to a desired value, using negative feedback from the controlled pressure. Regulators are used for gases and liquids, and can be ...

3. Proportional control - Wikipedia

   en.wikipedia.org/wiki/Proportional_control

   Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable, and the size of the correction is proportional to the difference between the desired value (setpoint, SP) and the measured value (process variable, PV).

4. Centrifugal governor - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_governor

   The balls swing out as speed increases, which closes the valve, until a balance is achieved between demand and the proportional gain of the linkage and valve. A centrifugal governor is a specific type of governor with a feedback system that controls the speed of an engine by regulating the flow of fuel or working fluid , so as to maintain a ...

5. Proportional–integral–derivative controller - Wikipedia

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

   Pressure control provided only a proportional control that, if the control gain was too high, would become unstable and go into overshoot with considerable instability of depth-holding. The pendulum added what is now known as derivative control, which damped the oscillations by detecting the torpedo dive/climb angle and thereby the rate-of ...

6. Pilot-operated relief valve - Wikipedia

   en.wikipedia.org/wiki/Pilot-operated_relief_valve

   The pressure at which the control pilot relieves is the functional set pressure of the PORV. When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere ...

7. This Sealy mattress is the best one to buy during Presidents ...

   www.aol.com/lifestyle/this-sealy-mattress-is-the...

   The mattress is down to $899 today in its Queen size, a savings of nearly $500 from its retail price. Ahead of Presidents' Day, you can also get a free mattress protector, sheet set, and pillow ...