A hydraulic door stopper is a mechanical device made to aid the door to close gradually and firmly enough to latch. These types of stoppers use hydraulic fluid to exert spring tension on a door. For instance, when a person opens the door, the hydraulic fluid is transmitted from one reservoir to another. Moreover, when the spring pushes the door, the hydraulic fluid proceeds back to the initial reservoir. Several valves are also installed to control the speed of the door. Hydraulic control valves are sold in different configurations. Some are designed to foster delayed action in which the door remains open for longer periods for people with disabilities.