1, damper, exhaust valves, and other types of high-level primary purpose of most modern building equipped with ventilation, air conditioning and smoke control systems, in the event of fire, these systems will be the flame pipe, smoke spread channel. In order to prevent the fire from spreading through the duct to expand, in the "building design for fire protection" GBJ16-87 and "fire protection design of tall buildings" GB50045-95 are clearly defined in the damper, exhaust valve setup requirements.
Dampers used in ventilation and air conditioning systems to send, return air duct on the road, usually was open,MUD VALVES when a fire occurs, the gas pipeline that is when the temperature reaches 70 ℃ itself off, and within a certain time to meet the fire-resistant stability and fire integrity requirements, smoke from the fire retardant effect. Exhaust valve in the exhaust system or exhaust pipe on the suction fan at the entrance, usually showing off, when a fire occurs, fire alarm signals by opening the valve manually or automatically, according to the system functions with the smoke, when the pipe flue gas temperature reaches 280 ℃ automatically shut down, and can fire at a certain time to meet the stability and fire integrity requirements, Balance Valvessmoke from the fire retardant effect.
2, damper, exhaust valve in the ventilation, air conditioning and smoke control systems, including the important role of gravity damper dampers, fire control valve, fire air, pneumatic dampers, smoke dampers, fire smoke electronic controlled valves and other products; exhaust valves including exhaust dampers, plate exhaust port (with roof), the shaft with the exhaust port and other products.  Dampers, exhaust valve is ventilation, air conditioning and smoke control system is an important component in the system play an important role in the following three aspects:
2.1, the role of smoke in the air supply system, fire retardant, air blower must be sent to the main branch in the distribution pipe; in the exhaust system, the flue gas from the branch to the trunk tube into the exhaust fan discharge. When building a fire occurs, the ventilation and air conditioning systems in order to prevent the spread of fire through the air supply system, when the air supply system, the gas temperature reaches 70 ℃, the dampers on the fuse body movement, valves are rapidly closed valve ,Instrument Manifolds cut off the smoke and fire spread along the duct path.Similarly, in the exhaust system, fire, exhaust valve is open, the smoke, in order to truncate the high temperature gas flow in the exhaust pipe to prevent the fire from spreading to another fire district, when the exhaust gas temperature 280 ℃, the smoke damper, exhaust port on the fuse action, the valve must automatically shut down to prevent smoke. Thus, fire damper, exhaust valve so that the General pass, that is off the smoke fire retardant effect.
2.2, regulatory role in the ventilation, air-conditioning system piping design, although calculated, but the actual construction of the moving line in working condition if there is a change, you need to damper valve through the various parts of the system to adjust air flow, system debugging , the fixed valve opening, a reasonable allocation to meet the design requirements.
2.3, the role of ventilation and air conditioning load and start the exhaust system of all centrifugal fans and axial fans for fire smoke in the installation, in order to be safe, so that the motor starting current minimum, usually no-load start, through the valve temporarily cut off the pipeline to achieve.

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