But the door of life without pressure damper door underground, as a security barrier, the door to protect thousands of miners underground. Shandong's coal without pressure damper mechanical production strict quality mark, strengthen the quality of supervision. Strive for tens of thousands of miners to build the Door of Life. No pressure damper is currently China coal mine throttle ideal one, it broke the formal structure of the old throttle, clever use of linkage equilibrium institutions, the role of negative pressure on the throttle body by balancing into a kind of internal forces, making just open the throttle and the counterweight and the door shaft friction related. One, no pressure damper characteristics: ① throttle open a small force, opening force is independent of the size and direction of the wind pressure; ② two-way across the wind, no longer need to set up a reverse throttle; ③ double sealed, a small amount of air leakage; ④ close smooth, safe reliable; ⑤ clever lockout to prevent wind and string Jishang personnel; ⑥ simple system, saving energy consumption, the new structure and beautiful. Second, the non-pressure damper open: manual operation. No pressure damper is mainly used in coal mine into the return air Lane Lane and principal liaison into the return airway between. When through the throttle, throttle can easily open, automatically shut down after let go, effectively prevent short circuits and airy romantic failures occur, lay the foundation for standardization and modernization of coal mine management. St. Shandong Coal Mine Machinery Co. flagship various doors, cushion beds, buffer strips, sleepers series mining equipment. Strong technical force, quality of service, you can rest assured that use.