The existence of smoke and fire dampers is to eliminate the risk of fire and prevent the occurrence of fire. It is generally installed on the smoke exhaust duct of the mechanical smoke exhaust system to prevent smoke and fire. The fire damper produced by one pipe is a type of temperature control valve made of memory melting alloy, which is closed by the action of gravity and spring mechanism. There are also new products that use memory alloys to generate deformation and close valves. Its function is to: when the temperature of the flue gas reaches 280 ℃, people have basically evacuated, and smoke exhaust has no practical significance. At this time, there is already a fire in the flue gas, and the valve automatically closes to avoid the spread of the fire. What precautions should we pay attention to when using smoke and fire dampers? Below, the editor will briefly explain the relevant knowledge points.
When the smoke exhaust system is also used as a ventilation air conditioning system, it is not only necessary to consider the air dispatch requirements during ventilation, but also to consider the requirements for sensitive smoke exhaust and fire prevention in the event of a fire. In addition, smoke exhaust and fire dampers are also suitable for ventilation and air conditioning pipelines installed on suspended ceilings, which cannot be manually reset. Circular fire dampers and smoke exhaust fire dampers are suitable for ventilation ducts in ventilation air conditioning systems with smoke and fire prevention requirements. They are particularly suitable for important buildings with halogenated hydrocarbon gas active equipment. Due to the requirement to block all valves before releasing gas, after the rescue is completed, the valve door should be opened for ventilation and exhaust.
Smoke exhaust and fire damper is an important component of the active system, which is installed on site to control the flow path. Therefore, it is an important equipment for blocking the flow path and preventing flammable fluids from entering the fire environment. It is crucial to open or close the smoke exhaust fire damper in case of fire. It is worth noting that due to the fact that the smoke exhaust fire damper is controlled by the dispatcher in the control room and not manually operated, the important feature of the smoke exhaust fire damper should be that it can fully experience temperature regulation and short-term work, or when it is difficult to block, the leakage should be minimized.
The standard for fire control valves is to adjust the packing box and other sealing components of the control valve, and if necessary, replace the sealing components, adhering to the sealing performance of static and dynamic sealing points. Add lubricating oil to the parts that need to be smooth. Conduct pollution discharge and cleaning work on the air source or hydraulic filtration system. Check the connection and erosion of each connecting point, and replace the connecting parts if necessary.
The general technical parameters of the fire and smoke exhaust valve series products are that the valve frame and blades are made of galvanized steel plate, without welding points, and do not require painting on the surface. The bearing material of the air valve is sintered bronze oil bearing, which can withstand high temperatures of 300oC and does not require protection. The thickness scale of the valve body is L=200mm, and various special sizes can also be produced according to customer needs.