Electric Actuators: Direct Operating Mechanism Explained

How does a direct operating, electric actuator operate?

Which of the following statements accurately describes the operation of a direct operating, electric actuator?

Answer:

In a direct operating, electric actuator, (b) the plunger is connected directly to the disc of a globe valve, which provides immediate and precise control.

Explanation:

In a direct operating, electric actuator, the plunger is connected directly to the disc of a globe valve. This direct connection allows for immediate and precise control of the valve's position. When an electric current flows through a solenoid, the movement of the plunger translates directly to the opening or closing of the valve, eliminating the need for mechanical linkages.

A solenoid is a cylindrical coil of wire that becomes magnetized when an electric current passes through it, generating a magnetic field. Changes in this magnetic field can induce electromotive forces in nearby conductive materials, as explained by Faraday's and Lenz's laws.

This understanding of electric currents, magnetic fields, and induced forces is essential in designing and operating electric actuators and other electromagnetic devices. The direct operation mechanism enhances the control and responsiveness of the actuator in various applications.