Control valves are divided into manual and electric types.According to the materials used, they are classified into fourtypes: iron plate, galvanized plate, aluminum alloy plate andstainless steel plate. The valve body structure and specifica-tion dimensions are the same. Air dampers are widely used in HVAC systems of industrial and mining enterprises as well as civil buildings to precisely regulate air flow. They are one of the key devices for controlling ventilation modes in various environments. Its main features are flexible operation,low noise, small leakage (leakage of sealed type <0.5%), wideworking temperature range, reliable structure, safety and convenience.

1.The connection size of this regulating valve is the same as the rectangular air duct size stipulated in the national ventilation duct standardization regulations.2.The blade of this regulating valve is of the split type. It is used as a regulating valve in ventilation, air conditioning and air purification systems, which is superior to the parallel typevalve (i.e., the forward-opening type).3.The closed double-opening multi-leaf control valve can be used for both regulation and sealing purposes, and is suitable for systems with opening requirements. For instance, the fresh air valve and exhaust valve on the air conditioning system are also suitable for systems that are only used as regulating valves or have both sealing and regulating requirements, as well as primary and secondary return airvalves, etc.4.Through experimental determination, the air tightness of the regulating valve is good, with a relative air leakage of about 5%, and its regulating performance is excellent.