Hydraulic Valve Actuator comes in many designs of which, the piston types are most common. It consists of a cylinder, piston, spring, hydraulic supply, return line and stem. The piston slides vertically inside the cylinder and separates the cylinder into two chambers. The upper chamber contains the spring and the lower chamber contains hydraulic oil. Hydraulic actuators are mainly utilized in areas such as the aerospace industry because they pocess a good power to weight ratio and also has a fast response.