Actuators used in industrial and other applications necessitate a thorough examination of the requirements before selecting the best actuator for the job.
FREMONT, CA: Actuators serve the huge responsibility of controlling movement and are significant component in numerous industrial valve control applications, from regulating the flow of fuel to a gas turbine to operating valves and hydraulic cylinders in industrial plants. Actuators require a controlled signal and an energy source to produce mechanical motion.
Electric actuators
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Electrical actuators require electricity to move. Electric actuators are considered more energy-efficient and clean because a readily available energy source powers them. Some common applications include the opening and closing of butterfly or ball valves. Electromechanical actuators are devices that translate electric signals into rotary, linear, or a combination of the two. Electromechanical actuators are more accurate, last longer, and require less maintenance.
Pneumatic actuators
Pneumatic actuators use a vacuum or pressured gas to act as a piston inside a cylinder to generate mechanical movement. Single-acting cylinders have a single port through which pressurized gas enters in just one direction. Double-acting cylinders stretch and retract without a spring and contain two ports through which air can enter and exit. Pneumatic actuators are popular because they are safe, generally fast, and cost-effective, and they can generate significant quantities of torque with minor pressure changes.
Electrohydraulic actuators
These actuators are powered by electricity but send movement to a hydraulic accumulator, which supplies the movement's force. When these actuators are employed, there is no need for a separate hydraulic pump, which reduces costs while improving dependability and safety.
Magnetic actuators
Magnetic actuators use magnetic effects to provide mechanical force, rotary or linear motion, and continuous or restricted motion. Magnetic actuators turn off or mix fluids and steam in various HVAC applications.
Hydraulic actuators
Hydraulic actuators employ hydraulic power to generate mechanical motion via a cylinder or a fluid motor with a piston. Depending on the application, mechanical motion is translated to linear, rotatory, or oscillatory. Liquids are almost incompressible; pressure and temperature have little effect on density. Hydraulic actuators are utilized in various applications, including main stop and control valves for high-pressure steam turbine pipes.
Thermal actuators
A thermal actuator uses a piston and a thermally sensitive substance to generate linear motion in reaction to temperature variations. Thermal actuators are frequently employed in applications requiring fluid mixing and diverting and in safety shut-off operations. Thermal valve actuators can operate even during a power outage and are reliable and safe since they are not susceptible to short circuits.
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