The valves have three kinds: manual split multiplevane adjustable valves, dynamic split multiplevane adjustable valves, seal split multiplevane adjustable valves and seal-dynamic split multiplevane adjustable valves. 

dynamic split multiplevane adjustable valves have two kinds: valve-position signal feedback and switchable signal feedback. If fire happens, smoke sensing probe alarms. Control center functions DV24V to come pothook away from spindle 3 pawl by controlling magnetic valve or pulling steel. under spring 1 effect, the valve discharges smoke. When smoke temperature raise 280℃, temperature senser 2 functions to shrink core axis so that the valve is closed by spring 2. After that, change the 280℃ fuse to reset swing bar.

Fume-discharged valves have many types: manual control, electrical control, temperature control, remote control and adjustable control according to control mode; round, rectangle, board and multiplevane according to structure.