Fire control valve installed in the ventilation and air conditioning system, the return air duct, usually was turned on, when the fire shut down the pipeline when the flue gas temperature reaches 70 degrees, and in a certain amount of time to meet leakage of smoke and fire complete requirements, since the role of smoke fire retardant. (1) The valve usually is always on when the airflow temperature reaches 70 ℃, the temperature sensor operation, the valve is closed; (2) within the range of 0 ° ~ 90 ° manually adjust the vane opening degree; (3) manually shut down or manual reset ; (4) the output valve closes signal can be interlocked with other fire-fighting equipment. Advantages: 1, low air leakage, 2 airtight performance, strong corrosion resistance and long service life. 3. Actuated flexible. Feedback, interlock signal accurate. The main functions and characteristics 1, manual open, manual reset closed. 2, the output signal and valve interlock control signal turns