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Features of Single Acting Pneumatic Actuators

Source:http://www.flowxgroup.comUpdate Time:2014-10-17Hits:

Pneumatic actuators are machines in which air is squeezed into a small container at a high pressure so that it gives off energy for the purpose of conducting mechanical work. It has a wide variety of pneumatic actuators, such as linear, rotary, oscillatory movement, actuating of concentric butterfly valves, eccentric butterfly valves, ball valves, plug valves, and box switching. Because of the high proficiency and effectiveness of air, about 90 percent of all of the pneumatic actuators put in use at this time are powered by compressed air. In comparison with electromechanical and electrohydraulic actuators with respect to cost, pneumatic actuators are comparatively less expensive in addition to its easiness and convenience to understand and maintain. This article is going to emphasize on single acting pneumatic actuators because this kind of device has been the most commonly used actuator for the past decades.

Single acting pneumatic actuators also have a name of diaphragm actuator. Most of the single acting pneumatic actuators are made to perform linear motion, even if there are still many actuators designing for rotary movement. In order to give a more specific definition of single acting pneumatic actuators, it pressures air to one side of an elastomeric barrier (so-called the diaphragm) in order for extension or retraction of the actuator stem. The stem is linked to the closing act. The barrier is located between upper and lower covers, which form like a sandwich. Either of the up and down can be utilized to hold compressed air, which is dependent on the feature of the single acting pneumatic actuators. The actuators are designed direct acting. Thanks to this kind of design, air pressure is transferred to the actuator, which lengthens the machine stem and allows the surface to close. This also functions as controlling the value to open because once air is lost the actuator will retract its stem, thus the value will also open and remain open. Also its reverse-acting design makes the stem retract and the value open when the air pressure is sent to the actuator. Also you needn’t worry if the supply or signal air pressure is stopped, the actuator will automatically move to the extended position, allowing the value to close. So that comes one of the features of single acting pneumatic actuators: inside the single acting pneumatic actuators, while opening or closing is acting by air pressure, the other acting is by spring.

And the device is user-friendly because both opening and closing limit positions are adjustable. The chief advantage of single acting pneumatic actuators is that they cost less to produce and are more commonly seen through the entire electric actuators because through so many years’ test, they have proved themselves to be stable. Talking of maintenance, the accurate manufacturing insures a long life time. Furthermore, the machine is a perfect mating with butterfly valve and ball valve. Last but not least, single acting pneumatic actuators can work in lower-pressure ranges, from which thrust requirements are not so demanding.

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