The main difference between a double-acting and a single-acting pneumatic actuator lies in how they operate and respond to air supply. A double-acting actuator requires air pressure on both sides of the piston to control the valve movement—when air is supplied, the actuator rotates and opens the valve; when the air is released on the opposite side, it closes the valve. This type of actuator does not have a built-in reset mechanism and only returns to its original position if air is supplied again.
On the other hand, a single-acting pneumatic actuator uses air pressure to open the valve, and relies on a spring to automatically return to its closed position when the air supply is cut off. This makes it ideal for applications where safety is critical, such as in environments with flammable gases or liquids. In the event of an air source failure, the spring-loaded mechanism ensures the valve closes automatically, reducing the risk of accidents. Unlike double-acting actuators, which require continuous air pressure to function, single-acting actuators are more reliable in emergency situations.
Single-acting actuators are typically available in two types: normally open and normally closed. A normally open actuator will close when air is supplied and open when the air is removed. Conversely, a normally closed actuator opens when air is applied and closes when the air is cut off.
Understanding the differences between these two types of actuators is essential for selecting the right one based on the specific application requirements and safety considerations.
Source: http://news.chinawj.com.cn
Image: http://i.bosscdn.com/blog/13/47/45/736238.jpg
Editor: Hardware Business Network Information Center
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