Working principle of residual pressure valve:

Install the residual pressure valve on the wall, and when the indoor pressure exceeds the set pressure, it will automatically push open the valve of the residual pressure valve, so that excess air can be discharged smoothly, thus maintaining the positive pressure difference between indoor and outdoor. The position of the heavy hammer can be adjusted according to the air volume and pressure difference required by the environment. When there is no positive pressure in the room, or the local outdoor pressure is greater than the indoor pressure (windy, etc.), the valve body of the residual pressure valve is closed to prevent the dirty outdoor air from flowing back to the room.

When there is a fire in the room, after the fire extinguishing gas is ejected, the valve body opening of the residual pressure valve will reach under the pressure, so that the indoor air can be discharged rapidly, the balanced pressure can be maintained, and the residual pressure valve can be installed on the wall for pressure relief. When the indoor pressure exceeds the set pressure, the valve of the residual pressure valve will be automatically pushed open, so that the excess air can be discharged smoothly, thus maintaining the positive pressure difference between indoor and outdoor. The position of the heavy hammer can be adjusted according to the air volume and pressure difference required by the environment.