Electric actuator | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:01:22 1 Types
00:01:39 1.1 Manual
00:02:24 1.2 Pneumatic
00:03:38 1.3 Hydraulic
00:04:37 1.4 Electric
00:05:05 1.5 Spring
00:05:44 2 Actuator movement
00:08:24 3 Features of an electric actuator
00:08:35 3.1 Motor (1)
00:09:19 3.2 Limit and torque sensors (2)
00:09:54 3.3 Gearing (3)
00:10:28 3.4 Valve attachment (4)
00:11:32 3.5 Manual operation (5)
00:12:09 3.6 Actuator controls (6)
00:13:11 3.7 Electrical connection (7)
00:13:48 3.8 Fieldbus connection (8)
00:14:19 4 Functions
00:14:29 4.1 Automatic switching off in the end positions
00:15:30 4.2 Safety functions
00:16:45 4.3 Process control functions
00:17:57 4.4 Diagnosis
00:18:26 5 Duty types
00:18:36 5.1 Open-close duty
00:18:55 5.2 Positioning duty
00:19:16 5.3 Modulating duty
00:19:58 6 Service conditions
00:21:10 6.1 Enclosure protection
00:21:58 6.2 Ambient temperatures
00:22:48 6.3 Explosion protection
00:24:11 7 Additional uses



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SUMMARY
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A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem. Power-operated actuators, using gas pressure, hydraulic pressure or electricity, allow a valve to be adjusted remotely, or allow rapid operation of large valves. Power-operated valve actuators may be the final elements of an automatic control loop which automatically regulates some flow, level or other process. Actuators may be only to open and close the valve, or may allow intermediate positioning; some valve actuators include switches or other ways to remotely indicate the position of the valve.
Used for the automation of industrial valves, actuators can be found in all kinds of process plants. They are used in waste water treatment plants, power plants, refineries, mining and nuclear processes, food factories, and pipelines. Valve actuators play a major part in automating process control. The valves to be automated vary both in design and dimension. The diameters of the valves range from one-tenth of an inch to several feet.