Product description: top party scattered by seat and valve bonnet, shells, shell and mutal benefit of such parts. It is roll Yang type hoister control lever system pull bonnet closing of the realization of the valve, the valve has simple structure, flexible for opening and closing, good seal performance, easy to operate, safe credibility etc.lt is mainly used in blast furnace, the furnace XiuFeng will the gas vented to atmosphere, in order to ensure the security of the system of blast furnace.