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A valve regulates it. In pneumatic lifts, airbags are used to move the scissor arms up and down. The Forklifts in Los Angeles can also be categorized into two types depending upon their drive mechanism - hydraulic lifts and pneumatic lifts. In hydraulic lifts, a liquid is used for the upward movement of the elevator. When the fluid is released, the scissor arms stretch and the lift moves up. The amount of liquid released depends upon the height to which the lift has to be raised.