Hydraulic scissor lifts can be used indoors and outside and powered by either an electric motor or compressed air. From cylinder to cylinder, the hydraulic liquid is pushed or drained, allowing the scissor lift to raise or drop as needed. Warehouses, construction sites, and infrastructure projects are all good places to use hydraulic scissor lifts. The scissor lift operator turns on the power supply. Filling the cylinder(s) with hydraulic fluid begins with the use of a valve to control the flow of fluid or air (or compressed air in a pneumatic system). The hydraulic fluid or compressed air is moved from the reservoir to the operating cylinders via the scissor lift control system. For upward movement, the hydraulic cylinder pushes outwards, causing the scissor legs to push apart, lifting the platform. The operator releases the hydraulic fluid or reduces the pneumatic pressure level in the cylinder by returning it to the reservoir to lower the scissor lift mechanism, causing the scissor legs to retract. The name “scissor” comes from the fact that between the base and the higher platform is a cross-braced mechanism (similar to the arms of a pair of scissors). Fixed installation lifts are frequently used to transport items from cars into a building’s goods receiving rooms between floor levels. Mobile hydraulic scissor lifts are tiny, lightweight equipment that can be used to move cargo or large objects around a factory or workshop.