Technical features:

1. It is normally open. In case of fire, the smoke (temperature) sensor sends an electrical signal (DC24V) through the control center, and the motor in the mechanism is energized to automatically close the valve and output an electrical signal for closing.

2. After the valve action, the DC motor drives to reset.

3. The valve can be closed manually and reset manually.

4. When the temperature rises to 280°C, the temperature sensor acts and the valve closes automatically.

5. The action signal or reset signal is fed back to the control center and the interlocking equipment is started.