Actuators are vital at every point. 7 Core Requirements. As a specialist in the water industry, Rotork is dedicated to meeting these 7 core needs with the actuators that we design and manufacture and the services we provide. 1. Specifying & Planning.
http://www.rotork.com/en/about-us/index/watersewage
An actuator also can be powered by electricity or hydraulics. Much like there are air cylinders, there also are electric cylinders and hydraulic cylinders in which the cylinder converts electricity or hydraulics into motion. Hydraulic cylinders, which use liquids, are often found in certain types of vehicles.
http://www.wisegeek.org/what-is-an-actuator.htm
An actuator is something that converts energy into motion. It also can be used to apply a force. An actuator typically is a mechanical device that takes energy — usually energy that is created by air, electricity or liquid — and converts it into some kind of motion. That motion can be in virtually any form, such as blocking, clamping or ejecting.
http://www.wisegeek.org/what-is-an-actuator.htm
Linear actuators convert rotary motion into linear motion. The common drive methods used in this conversion are lead screws, ball screws, belt/pulley or chain/sprocket. Many times an electric motor is coupled to the screw, pulley or sprocket. These motors can be positioning motors like stepping motors or servo motors.
https://www.quora.com/What-is-a-linear-actuator-and-where-can-I-use-it
We are the world's largest independent manufacturer of heavy duty valve actuators and our products control thousands of valves in water and sewage plants across the world. Actuators are Vital. Managing water and waste water plants is a complex operation and safety and efficiency are paramount.
http://www.rotork.com/en/about-us/index/watersewage
An actuator is a component of a machine that is responsible for moving or controlling a mechanism or system. An actuator requires a control signal and a source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic or hydraulic pressure, or even human power. The supplied main energy source may be electric current, hydraulic fluid pressure, or pneumatic pressure.
https://en.wikipedia.org/wiki/Actuator
, works at Jacobs Engineering. In many processes the fluid is allowed to flow only if a certain amount of fluid is build up upstream of the directional flow valve. These valves are operated by actuators which sense the pressure and open the flow. Being a directional valve they obstruct the reverse flow. Such kind of valves are mostly followed in pumps discharge.
https://www.quora.com/Why-are-actuators-used-in-directional-control-valves
Actuators & Servoactuators. Multi-purpose Actuators and Servoactuators. Multi-purpose actuators and servoactuators can be used for a variety of high-performance applications and are standard building blocks used in a variety of systems.
http://www.moog.com/products/actuators-servoactuators/multi-purpose/
Tolomatic is the #1 RSW (resistance spot welding) actuator manufacturer. Tolomatic is the world's leading manufacturer of integrated servo actuators for resistance spot welding used by the world's top weld gun OEM's and numerous global vehicle manufacturers. Longest service life with the most welds. Best force repeatability for the highest quality welds. High efficiency.
https://www.tolomatic.com/Products/Electric-Linear-Motion/ServoWeld-Actuators/Why-ServoWeld-Actuators
In simple words , an actuator that produces motion in a straight line. The term “linear actuator” has come to mean different things in different industries and applications. In a general sense, every linear actuator is a device which converts some type of rotary force and applies it to achieve an in-line or linear movement.
https://www.quora.com/What-is-a-linear-actuator-and-where-can-I-use-it
why actuator is used
An actuator is used to apply force. Actuator is used to apply a force.