The 280-degree fire damper shall be normally open, also known as high-temperature fire damper. Generally, it is installed in a ventilation pipe with high-temperature environment. When the temperature reaches 280 ℃, the fusible alloy melts and the valve is closed. At the same time, it can be controlled by 24V electrical signal. If the 280-degree fire damper is normally closed, the control center of the device gives an electrical signal to open the smoke exhaust when the smoke exhaust pipe starts. When the temperature reaches 280 ℃, the fusible alloy melting valve is closed, is a secondary action of the valve, used in the exhaust system pipe, usually open, fire smoke, when the smoke temperature reaches 280 ℃, the fire valve closed, interlocking fan closed.
When installing a 280-degree fire damper, attention should be paid to the direction of air flow, so that the fuse touches the hot air flow before the blade shaft. When resetting, the top cap should be covered first, the fuse should be pulled out, the fusible sheet should be replaced, the fuse should be installed, the top of the core rod should be inserted into the fork plate, and then the valve opening should be adjusted. The primary structure is the primary components: valve body, valve blade, valve blade, fire valve shaft, shaft, shaft, shaft, shaft, shaft lining, check, check port, check port, when the blades are separated and the scale is ≥ 1500, 2 actuators are installed, and the torsion of the actuator torsion spring can be adjusted in three gears.

Fire valve raw materials also have certain norms:
1. The appearance of the fire damper valve plate is flat and lubricated, without processing defects and scratches, and the coating is uniform.
2. The thickness of the fire damper plate is not less than 1.5 ㎜, the weld seam is full and there are no defects such as slag inclusion, bubbles, virtual welding, etc., the structure is strong, and the flange raw material and the air duct raw material should be common.
3. The manual and electric operation of the fire damper should be flexible and reliable, and the signal output should be normal.
4, the fire valve valve plate closed should adhere to tight.
5. The shaft and hinge of the valve leaf should be made of materials that are not easy to rust.
6. The fusible equipment should have reliable performance and should be tested on site if necessary.

The importance of fire damper device for fire exhaust fan.
1. The operating mechanism side of the fire valve should have a net space of not less than 2 fire damper 00mm to facilitate maintenance.
2. It is necessary to check whether the operating mechanism of the valve is intact and whether the action is sensitive and useful before the fire damper is installed.
3. Fire damper can be interlocked with ventilator and exhaust fan.
4. Fire damper should be set up alone hanger, in order to avoid the fire when the deformation of the pipeline affects its function.
5. Fire dampers shall be installed in the air duct section close to the wall or floor slab. The fire dampers on both sides of the partition wall of the fire compartment shall not be more than 200mm from the wall surface. The pipelines and their insulation materials within 2.0m on both sides of the fire dampers shall be non-combustible materials.

Because there is too much water in the oil, the oil fume contains water vapor. When the water vapor meets a colder pipe, it condenses into water. The condensed water flows back into the fan casing through the outlet pipe of the exhaust fan under the condition that the oil fume separator has poor drainage, and then enters the motor from the fan casing, causing the coil insulation to drop and the motor to burn out.
Fire valve fire control valve in a certain time can be satisfied with the amount of smoke leakage and fire integrity requirements, the effect of smoke fire prevention, today's small series for us to explain the function of fire control valve introduction, the specific content is as follows:
1. The valve of the fire control valve is normally open. The DC24V power output from the control center can actively close the valve, and can interlock for ventilation. The air conditioning fan stops and outputs a closed signal.
2. At 70 ℃, the temperature fuse acts and the valve is closed. Press the manual button of the actuator on the valve to close the valve.
3. When the fire control valve is required to be opened again, the electrical signal can actively reset the valve to the original open condition, the reset button> 12N.m, and can interlock ventilation, and the air conditioning fan is actively opened.
4. The valve can be centrally controlled by the central control room or actively controlled by the unit.
5. The adjustment equipment on the organization can adjust the opening of the valve blade in stages, and the levels are divided into 18 °,36 °,54 °,72 °, and 90 °.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures