[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - manual control valve] Material: Aluminum / steel / stainless steel / galvanized steel product features: aluminum electric closed valve / aluminum air flow control valve of this product mainly used to regulate air flow, reducing wind speed, air pressure, reduce noise dampers pictures, and closed quite effective. The main approach is driven by a gear lever smoke damper drive, manual or electric adjustment. Aluminum electric air valve is mainly used in central air-conditioning system [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - exhaust valve exhaust valve]: smoke partition for use either branch duct dampers , exhaust valve is normally open, but due to the uncertainty of the fire zone dampers, the exhaust valve should be open again be closed, and therefore should be electric. Either a smoke partition fire, the fire control center in the area can have a smoke exhaust valve opens, the other partitions exhaust valves closed. If the smoke partition not use either branch duct, the duct that is in parallel with a dedicated primary exhaust pipe only, then the exhaust valve on the exhaust manifolds are normally closed, and with the smoke detectors linked electromagnetic valve manual reset . General non-use either the exhaust valve exhaust system is also true. Round damper | Chongqing damper | Tianjin Jinzhong Ji damper manufacturer provided by the Tianjin Jinzhong Ji HVAC purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) strong, credible, in Tianjin fans, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the group into the brilliant and you work for a better future!