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What are the national standard specifications of 3C fire valves?
2022-11-22
Fire valve is a common fire fighting product in the ventilation and air conditioning system of industrial and civil buildings and underground buildings. And 3C fire valve, is taking into account the premise of fire safety, fire valve products to do the fire requirements.
According to the "building ventilation and smoke exhaust system with fire valve GB15930-2007" national standards, Henan Shuangxin take you quickly understand the 3C fire valve national standard specifications are what.
1. Definitions and terms of fire valves
And/or damper, the name symbol is "FHF" and the full name is "fire damper".
It is installed on the supply and return air pipes of the ventilation and air conditioning system. It is usually open and closed when the flue gas temperature in the pipes reaches 70℃ in the case of fire. It can meet the requirements of smoke leakage and fire integrity in a certain period of time and play the role of smoke isolation and fire resistance.
2, fire valve structure and materials
Fire valve is generally composed of "valve body, blade, actuator and temperature sensor" and other components.
Among them: "valve body, blade, baffle, bottom plate and shell of actuator" should be made of "cold-rolled steel plate, galvanized steel plate, stainless steel plate or inorganic fireproof board" and other materials.
Bearings, bushings, spines (convex) wheels in the actuator and other important moving parts are made of brass, bronze, stainless steel and other corrosion-resistant materials. The production of all kinds of springs should meet the corresponding national standards.
3, fire valve accessories: actuator. The actuator of the valve shall be qualified products tested by the national authorized testing institution. The temperature sensor element in the fire valve actuator shall be marked with its nominal operating temperature.
4. Appearance of fire valve. The label on the valve should be firm, and the label should be clear and accurate.
The surface of all parts of the valve should be smooth, and no cracks, depressions and obvious concave and convex, hammer marks, burrs, holes and other defects are allowed. The weld of the valve should be smooth and smooth, and it is not allowed to have defects such as virtual welding, porosity, slag inclusion and loose.
The surface of the metal valve parts should be anti-rust, anti-corrosion treatment, after treatment of the surface should be smooth, smooth, coating, coating should be firm, there should be no peeling, coating cracking and paint leakage or flow phenomenon.
5. Tolerance of fire valve. The linear dimensional tolerance of the valve shall conform to the Class c tolerance class specified in "GB/T 1804-2000".
6, drive torque and reset function. The drive torque generated by the fire valve blade closing force on the drive shaft should be greater than 2.5 times of the required torque on the drive shaft when the blade is closed. Valve should have reset function, its operation should be convenient, flexible and reliable.
7, control mode: temperature sensor control. The fire valve should have the temperature sensor control mode to make it close automatically. The temperature sensor does not work. The temperature sensor in the fire valve should not work for 5 minutes in the constant temperature water bath at 65℃± 0.5 ℃. Operation performance of temperature sensor: The temperature sensor in the fire valve should operate within 1min in the constant temperature water bath of 73 ° C ± 0.5 ° C.
8. Control mode: manual control. The fire valve should be manually closed; The exhaust valve should be opened manually. Manual operation should be convenient, flexible and reliable. Manual closing or opening operation force should not be greater than 70N.
9. Control mode: electric control. The fire valve should be equipped with electric closing mode. Valve with remote reset function, when energized action, should have a signal output showing the position of valve blade.
The working voltage of the electronic control circuit in the valve actuator should be DC24V rated working voltage. Its rated working current should not be greater than 0.7 A. When the actual power supply voltage is 15% lower than the rated working voltage and 10% higher than the rated working voltage, the valve should be able to operate normally with electronic control.
10, the closing reliability of the fire valve. After the fire valve or smoke exhaust fire valve has been closed and opened for 50 times, all parts should have no obvious deformation, wear and other damage affecting their sealing performance, and the blades can still be closed flexibly and reliably from the open position.
11, fire valve corrosion resistance. After 5 cycles, a total of 120h salt spray corrosion test, the valve should be able to open and close normally.
12. Air leakage volume at the ambient temperature of the fire valve. Under ambient temperature, keep the gas static pressure difference of 300Pa±15Pa on both sides of the fire valve blade, and the air leakage volume per unit area (standard state) should not be greater than 500m3/ (m2·h).
13. Fire resistance of fire valve. Within 1min after the fire test starts, the temperature sensor of the fire valve should be operated and the valve should be closed. In the prescribed fire time, keep the gas static pressure difference of 300Pa±15Pa on both sides of the fire valve blade, and the smoke leakage per unit area (standard state) should not be more than 700m3/ (m2·h).
In the prescribed fire time, the surface of the fire valve should not appear more than 10s of continuous flame. The fire time of the fire valve should not be less than 1.50h.
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