Non-pressure pneumatic throttle! Our well-designed quality of the soul, is the basis of the quality of construction standards, strict supervision is the key to quality, intensive processing is a guarantee of quality. Grasp the security, in order to see the dawn. Hope to cooperate with you for mutual benefit. 1, no pressure damper according to the manual operation mode is divided into non-pressure dampers, automatic throttle without pressure, without pressure pneumatic automatic throttle, electric automatic throttle without pressure. 2, no pressure damper is mainly used in coal mine into the return air liaison lane roadway and into the main 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. 3, no pressure damper main technical indicators:? ① throttle open form: synchronized switching to different ② door size:?? Depending on the roadway on condition ③ door open angle ??:? ≤90 ° ④ counterweight:?? About ? 16kg ⑤ opened manually force ??: about 160N 4, no pressure damper conditions apply: ① ambient temperature is not higher than + 40 ℃ ~ -20 ℃; ② altitude air relative humidity less than 95%; Shandong Coal Machinery Co., St. The company flagship various mine gate, bed cushion, cushion bar, sleepers series mining equipment. Strong technical force, quality of service, you can rest assured that use.