By the use of Conditional: common type (140h running time of less than a week) and public transport type (week more than 140h run time). (3) By lifting height points: a small lift up to 8m height, escalators, and lifting up to 25m in height and a maximum lifting height of up to 65m 3 large classes. (4) by the speed of points: a constant speed and two speed can be. (5) Press Cascade running track points: a straight (traditional), spiral, track-type and rotary screw type tensioning device Class 4: As shown, the escalator prices by a ladder chain tensioner 6.5 wheels, shafts, tension springs and other car and the composition of step chain tensioner. Tension spring tension adjustment nut may Leling escalator, so the step chain in the escalator when in good working condition. When rung strand breaks or elongation, the tension roller trolley precise guiding displacement to safety devices (Cascade-strand break protection) act, escalators stopped immediately. Escalator sale _ Noah Witt elevator (Online) _ LELING escalator by Texas Noah Witt Elevator Company. Texas Noah Witt Elevator Co. (www.dznywt.com) (www.dznywt.com) is an industry leader in Shandong Dezhou, machinery and industrial products, cooperation projects over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. Noah Witt Elevator leadership with the staff warmly welcome all inquiries negotiations to create Noah Witt elevator a better future.