Eccentric plug valve is used as a reliable alternative to ball or gate valves. These are designed to handle a wide variety of liquids, gasses and solids, including water, air, petroleum, paint and non-corrosive chemicals. Basic structure is consists of plug, cover, body, position indicators, stem seal and bearing.

Electromechanical actuators convert electrical energy into mechanical energy. The common types of electromechanical actuators by their energy conversion mechanism are electromagnetic, electrostatic, and piezoelectric. In electromagnetics, the air gap separates a stationary member and a moving member of an electromechanical actuator. The amount of energy per unit volume of air gap for magnetic fields can be five orders of magnitude higher than that of electric fields. The advantage of electrostatic is the higher switching rate and less energy loss. Electrostatic actuation is the main actuation for moving charged toner particles in electrophotographic processes. Piezoelectric is the property of certain crystals that produces a voltage when subjected to mechanical deformation, or undergoes mechanical deformation when subjected to a voltage.

Electromechanical linear actuator converts the rotary motion and torque into linear thrust and displacement. It is interfaced and controlled with the aid of programmable logic controllers and microprocessors. It is used in precision motion control applications. Linear actuators are self-contained ball screw units, which is driven by electrical motors. Both DC and AC motors are used.