| One of the advantages of using machines to | | | | chance that a spark can be generated to |
| control processes | | | | cause a fire. However |
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| for you is that you can harness tremendous | | | | using air for actuating may be more |
| amounts of power | | | | expensive to install and |
| | | | |
| and energy which humans do not possess.By a | | | | to maintain.Using electrical motors to drive |
| flick of a switch, huge sliding flood gates | | | | gearing may be an excellent |
| can move to | | | | |
| | | | choice when cost is a consideration. |
| allow large quantities of water to flow out | | | | Electrical wires can be |
| of a dam. With | | | | |
| | | | laid more easily and electrical systems are |
| just a slight twist on a handle, | | | | relatively clean.Use of hydraulics may be |
| supertankers weighing | | | | excellent where power and simplicity |
| | | | |
| hundreds of thousands of tons are able to | | | | is important.Most of the actuators operate |
| turn because of the | | | | in a linear (straight line) |
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| corresponding rotation of huge | | | | manner. Hydraulic rams, and pneumatic |
| rudders.Similarly, processes operating valves | | | | diaphragms work in this |
| can be remotely operated | | | | |
| | | | manner. There are also some that are |
| to control flow, temperatures, pressures and | | | | constructed to operate |
| so on.All these final control elements - | | | | |
| flood gates, rudder, | | | | in a rotary manner.Electrical motors |
| | | | normally operate in a rotary manner. However |
| valves - must be operated by actuators. The | | | | |
| function of the | | | | if a linear motion is needed, this can be |
| | | | obtained by means |
| actuator is to move to control elements in | | | | |
| the processes.In order to move the actuator, | | | | of spur gears, rack and pinion arrangements, |
| there must be a medium for | | | | crank and other |
| | | | |
| transmitting the required power or action. | | | | means.Actuators can provide the power to |
| All the actuators | | | | move final control elements, |
| | | | |
| are mechanical in nature. The common means | | | | but do they know when to stop?A good control |
| of transmitting the | | | | system will provide the sensing and feedback |
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| power are: pneumatic (air), hydraulic | | | | loop to tell the actuator when to stop its |
| (fluid), and electrical | | | | actions.Well folks, be in control!"Tap the |
| | | | Traditional Effective Information Source!" |
| (motors).The actuators must be designed to | | | | Magazines |
| work for that medium. There | | | | |
| | | | contain more information for you. Use them |
| are several advantages and disadvantages for | | | | to as your tools! |
| choosing a | | | | |
| | | | "Obtain QUALITY INFORMATION through these |
| particular medium. For example, pneumatic | | | | time-tested media!"Many years of working |
| actuators are | | | | experience in Marine, Facilities, |
| | | | |
| particularly useful when the atmosphere | | | | Construction has given the author material |
| contains flammable | | | | for writing e-books |
| | | | |
| gases. By using pneumatic actuators, there | | | | and articles related to engineering, and |
| is very little | | | | management. |
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