Special characteristics of the powder hopper valve high temperature, higher pressure range, the valve nominal diameter large, carbon steel valve body, valve plate seal with a metal ring to replace the rubber ring. Large temperature valve welded steel plate manufacturing, mainly for duct smoke and gas pipelines hot medium. Cement silo dust powder special butterfly is an important part of the product, its quality is good or bad determines the overall efficiency of dust, so choose a good powder hopper dedicated butterfly is a very important thing. At the time of purchase can choose according to different angles. By adjusting the medium parameters selection of valve: in the production process, in order to pressure the media, flow and other parameters meet the process requirements, the need to install the adjusting mechanism to adjust these parameters. The main principle of regulating agencies, is by changing the flow area of ??the valve and valve seat between the valve, to regulate the purpose of the above parameters. Such valves are referred to as control valves, which is divided into relying on the media itself is called self-powered drive control valve, such as valve, regulator valve, all leading power-driven as he was driving a control valve, such as electric control valve, pneumatic control valve and hydraulic control valve. Backflow valve to prevent the media by choice: the role of this type of valve is only allowed media to flow in one direction, and stop the flow direction. Usually the valve is automatically work in a direction of flow of the fluid pressure effect, the valve opens; opposite direction of fluid flow from the fluid pressure and the valve from the coincidence of acting on the valve seat, thereby cutting off the flow. Check them belong to this type of valve, which includes swing check valves and lift check valves.