Air volume control valve T308-1 closed off more Yefeng volume control valve application: Multi Yefeng amount off valve is generally used in air conditioning and ventilation system pipes, used for adjusting the air flow manifold can also be used to adjust the fresh air mixed with return air . The valve is divided into two kinds of manual and electric. Electric can automatically adjust the air volume control and automatic control system supporting. T301-1 ~ 9 Steel Butterfly applicable: T301-1 ~ 9 round, square, rectangular steel butterfly feeder air conditioning ducts usually plays the role of regulating the amount of wind. Mode of action is divided into two kinds of handles and zipper. T303-1 round duct valve YA type residual pressure valve galvanized sheet galvanized sheet valve flange valve sizes 28mm and 35mm are available with two quick dispensing altogether plate duct system. The remaining part of the dimensions and technical parameters are in accordance with the original sample data.