Positive pressure fans and pressure sensors between the linkage, the national standard atlas can not see above, you should refer to that Atlas
When the pressure fan is pressing the staircase, the pressure between the stairs is great. Our leader said, when the accident to ensure that children can also open the door to escape, so the fire must bypass pressure relief valve linkage, guarantee the stairwell and the chamber pressure value 30Pa. So the pressure value must be measured by the sensor, measuring the pressure difference between the staircase and antechamber.
The stairs to ensure positive pressure fire smoke will not enter the stairs of evacuation staircase, but too many people than pressure room not open directly staircase door, so there is a pressure differential pressure sensor is limited to pressure difference, but I did not get to know only the pressure sensor is disposed on the stairs. What is measured between the staircase and antechamber pressure difference.
The inlet and outlet of the positive pressure air blower is used as a bypass pipe, and an electric valve (fire control) is arranged on the bypass pipe. The pressure sensor is arranged between the staircase and antechamber (it should be said that the differential pressure switch), set to 30Pa (reference code for fire protection of staircases and chamber pressure requirements). When the staircase and antechamber measuring pressure greater than the set value, the bypass control valve open pressure relief; less than the set value the bypass valve is shut down pressure.
