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Quality requirements in the difference project of 70 ℃ and 280 ℃ fire dampers

Release Time：2021-07-15

Fire damper is also used to block smoke and flames from the fire area, and can consider the reliability of fireproof materials and the consistency of fireproof materials within the necessary time. It is normally opened and closed at 70 ℃, and manually calibrated and installed in the air duct. When a fire occurs, it should block the air duct, which has two effects:
1. Do not transport gas to the fire site to prevent burning.
2. Block the spread of open flames from the air duct to other areas.
The common fire dampers are 70 ℃ and 280 ℃. What is the difference between the two specifications of fire dampers? The ambiguous net below is made up for everyone to share for a while.
The 70 ℃ fire damper is used on the ventilation duct. When a room is on fire and smoke fills the ventilation duct, the gate valve is closed to prevent smoke and sparks from spreading to other tobacco control areas.
The 280-degree fire damper is used for ordinary ventilation. The fire must be discharged through the pipeline at that time. Therefore, the 70-degree fire damper cannot be turned off at that time. If it reaches 280-degree, it indicates that the pipeline already has fire explosion and loses the need for exhaust. Therefore, the fire damper must be turned off.

Temperature sensor action performance test.
The fire valve, smoke valve temperature sensing element, respectively, through the constant temperature water bath, oil bath of the specified temperature, through no action and action test, to test whether it can be accurately closed according to the requirements of the temperature.

Turn off the reliability test.
After 250 times of closing operation on the test bench, the sample shall be able to be closed flexibly and reliably from the open position, and all parts shall be free of obvious wear, deformation and damage affecting its sealing performance, so as to test the reliability of closing.

Salt spray test.
The fire damper specimen in the salt spray chamber for salt spray test, the specimen should be able to reliably close from the open position, in order to test the corrosion resistance of the valve in the actual project.

Air leakage test.
Before and after the valve body in the specified differential pressure conditions, the test piece unit area of the air leakage is not more than 700 Nm3/(h · m2), in order to test the valve closed after the airtight performance.

Fire test.
Through the fire resistance test, the fire resistance of the valve is determined according to the two indicators of the closing capacity and the air leakage per unit area within the specified time.