Off more Yefeng flow valve off more Yefeng amount adjusting valve FT, sealed off more Yefeng flow valve FMT apply: off more Yefeng flow valve, commonly used in air conditioning, ventilation duct, to adjust the tilt tube air flow can also be mixed with return air conditioning and with a new style. The valve is divided into manual and electric, by sealing points, can be divided into airtight and Normal two. Electric automatic control and automatic control systems to regulate air flow supporting. FT-type air volume flow rate control valve performance electric air volume control valve electric air flow control valve actuators well and round forms. Square electric actuators can manually disengage the motor gear for manual adjustment; and round electric actuator can not. Round electric actuators operate more stable output signals and automatic feedback control system interlock round, square and rectangular steel butterfly FTY-1, FTY-2, FTF-1, FTF-2 Application: round, square rectangular steel FT system with multi-leaf off butterfly valve to regulate air flow from the same role in the air conditioning duct, according to use, is divided handle style and zipper. (Note: The zipper order should indicate horizontal or vertical installation, the icon for the vertical installation). Duct valve FZY-1, FZF-1, FZF-2 valve is generally used in the air conditioning duct, the fan is stopped after gas backflow prevention required wind speed of not less than 8 m / sec use when ordering Description is mounted vertically or horizontally mounted, horizontal installation to installation weight to balance the upper leaves hoist flexible, FZF-2 is manufactured with a thin aluminum multi-leaf form only for horizontal installation.