Resettable valve

1. A device for controlling a flow of fluid from a first side to a second side of a passageway, comprising:

a valve situated within a connection between the first side and the second side;

a spring configured to rotate the valve from a first position to a second position;

a cam attached to the spring;

a lever having a first end, a second end and a pivot located between the first and second ends;

a rotary actuator comprising a first and second arms rotatable about a rotational axis of the actuator, wherein a rotation of the actuator causes the first arm to move the first end of the lever in one direction and an opposite rotation of the actuator causes the second arm to move the first end of the lever in an opposite direction, and the actuator is configured to switch the lever between a first state and a second state;

a handle for manual operation of the valve between the first position and the second position; and

a declutch mechanism for engaging and disengaging the handle for manual operation with the valve;

wherein the second end of the lever is configured to engage the cam, holding the spring from rotating the valve when the lever is in the first state, and to disengage the cam, releasing the spring when the lever is in the second state.

2. The device of claim 1 , wherein the actuator is configured to switch the lever from the first state to the second state when activated by a sensor which detects a predetermined event at the device.

3. The device of claim 1 , wherein the actuator is configured to switch the lever from the first state to the second state when activated by an electric signal.

4. The device of claim 1 , wherein the actuator is a pneumatic actuator configured to switch the lever to the first state when air is supplied, and to switch the lever to the second state when air is not supplied.

5. The device of claim 4 , wherein the device comprises a fusible plug in an air line to a supply port on the pneumatic actuator such that in an event of fire or heat, the fire or heat melts the plug causing a loss of air supplied to the pneumatic actuator.

6. The device of claim 4 , wherein air is supplied through a solenoid valve.

7. The device of claim 6 , wherein the solenoid valve is controlled by an electric signal or by a push of a button.

8. The device of claim 1 , further comprising a dampening device configured to dampen a rotational force caused by the spring.

9. The device of claim 1 , wherein the valve is a disc such that the valve is moved between the first position and the second position by 90 degrees rotation of the disc.

10. The device of claim 1 , further comprising a stop configured to stop the rotation of the valve by the spring when the valve is in the second position.

11. The device of claim 1 , further comprising a stop configured to stop the valve from further rotating by the handle for manual operation when the valve is in the first position.

12. The device of claim 1 , wherein the handle for manual operation is a handwheel.

13. The device of claim 1 , wherein the first position is where the valve is fully open and the second position is where the valve is closed.

14. The device of claim 1 , wherein the first position is where the valve is closed and the second position is where the valve is fully open.

15. The device of claim 1 , wherein the actuator is configured to switch the lever from the first state to the second state when activated by a user depressing a button located on the device.