1. Normally closed smoke exhaust fire damper (normally closed, telecommunication signal open, 280 degree fuse closed, or manually closed) is generally used in smoke exhaust system. One can be installed at the suction port of smoke exhaust fan. In case of fire, the smoke exhaust fan can be controlled to open by the fire control room, and the smoke exhaust fan can also be interlocked when closed.
2. Smoke exhaust valve is the same as the above 3. Each unit is called different. Some are called smoke exhaust valve according to its operating temperature, and some are called fire dampers according to its nature of use. However, for the equipment side, only the fuse metal of ordinary fire dampers is replaced by the 280-degree fuse..
3. Full-automatic smoke exhaust fire damper (for subway engineering) underground railway ventilation and air conditioning system fire prevention. The smoke exhaust valve has the function of linkage control with automatic fire alarm equipment and gas fire extinguishing system. Each full-automatic smoke exhaust fire damper has two independent electric control signals, which are respectively monitored by EMCS and gas elimination system. The control signals are DC24V 10% signals, each full-automatic smoke-proof fire damper has six independent feedback signals (three fire dampers are opened in place and three are closed in place). The feedback signals are all normally open passive contact signals.
Smoke fire damper is usually open, fire is also open, but when the smoke temperature reaches 280 ℃, smoke fire damper automatically closed, linkage has been opened fan stop running.
The normally closed smoke exhaust fire damper is opened in case of fire and the interlocking fan is closed at 280 ℃. It is generally applied to the smoke exhaust system and can be installed at the suction port of the smoke exhaust fan. The smoke exhaust fan can be controlled to open in case of fire by the control room and can be interlocked when closed.
Normally open directly close the chain fan at 280 ℃, generally used in fire smoke exhaust pipe through the firewall, smoke temperature exceeds 280 degrees automatically fuse shut down, can chain shut down the exhaust fan.
Smoke exhaust fire damper is normally open or normally closed. For room smoke exhaust system, when the smoke exhaust pipe of one fire zone is equipped with smoke exhaust ports of multiple smoke prevention zones, normally open smoke exhaust fire damper shall be set on the main pipe of the fire prevention zone, and the smoke exhaust port or smoke exhaust valve of normally closed fire damper shall be set on the branch pipe of each smoke prevention zone. For aisle smoke exhaust system, refer to the relevant regulations in the next article.
4.2.3 The mechanical smoke exhaust system should be set horizontally according to the fire prevention zone. The horizontal air duct on each floor should not cross the fire prevention zone. However, some floors have a large area. It is difficult to set up the smoke exhaust system according to the fire prevention zone. When it is necessary to cross, a smoke exhaust fire damper that can be automatically closed at 280 ℃ should be set at the crossing place.
Smoke fire dampers are normally open or normally closed, depending on the form of the smoke outlet.
(1) When a normally closed smoke exhaust port is set, a normally open smoke exhaust fire damper is set on the smoke exhaust branch pipe.
(2) When a common normally open air outlet is set, a normally closed smoke exhaust fire damper is set on the smoke exhaust branch pipe.
(3) When the normally closed type special fire exhaust port is set, the smoke exhaust branch pipe is not equipped with smoke exhaust fire damper.

smoke fire valve advantages:
1. Low air leakage and good air tightness.
2. The electric opening consumes a small current.
3. Strong anti-corrosion performance, long service life, 4. Flexible actuator drive, feedback, accurate fire damper interlock signal.

Main functions, features.
1. Input DC24V electrical signal, the electromagnet acts, and the valve opens quickly.
2. Manually open, manually reset and close.
3, can output valve open signal and interlock control signal.

Smoke fire valve set in the ventilation and smoke exhaust system pipe, can effectively prevent the fire when the high temperature toxic smoke transmission, cause the fire spread and increase the toxicity, but where should we install smoke fire valve.
(1) The primary position is where the pipeline crosses the partition wall of the fire compartment.
(2) The pipeline shall pass through the ventilation and air conditioning machine room and the partition wall and floor slab of the room with important or high fire risk.
(3) The horizontal pipe section at the junction of the vertical air duct and the horizontal air duct of each layer.
(4) The pipeline crosses both sides of the deformation joint.
The above four parts need to install smoke fire damper, in the event of a fire, the gas temperature in the pipeline reaches 70 degrees, it will automatically close, a certain period of time to isolate the output of the gas, to prevent the spread of fire.
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