Coal Gate manufacturer / supplier in China, offering Stainless Steel Intelligent Regulating Damper Pressure-Free Shut-off Butterfly Valve, Standard Manufacturing, Non-Standard Customization, The Material of The Electric Isolation Baffle Door for The Evaporator Inlet and Outlet Is Q345b Multi-Blade Regulating Damper, Customized Baffle Doors for Small-Diameter Butterfly Valves Ranging From DN80 to DN400 Are Used for Primary Cold Air and Secondary Air Ducts and so on.