A( is a device that provides the power and motion to manipulate the moving parts of a valve or damper used to control fluid flow. a. actuator b. pilot-operated regulator c. ratio regulator d. sliding stem

Out of the four options provided

option A. actuator

is correct

Explanation:

An actuator is the only device out of the four mentioned devices that provides power and ensures the motion in it in order to manipulate the movement of the moving parts of the damper or a valve used whereas others like ratio regulator are used to regulate air or gas ratio and none mof the 3 remaining options serves the purpose

fanswer:

explanation:

f