summary

The fire damper, normally open and closed at 70 ℃ or 280 ℃, is generally installed at the place where the air duct passes through the firewall and plays the role of fire shutdown. The output electric signal can be set. When the temperature exceeds 70 ℃ or 280 ℃, the valve is closed and the linkage supply (make-up) fan is closed.

Fire damper

It is installed on the air supply and return pipelines of the ventilation and air conditioning system and is usually open. In case of fire, when the gas temperature in the pipeline reaches 70 ℃, the fusible link will fuse, and the valve will automatically close under the action of torsion spring force. It can meet the requirements of fire resistance stability and fire integrity within a certain time, and plays the role of smoke isolation and fire resistance. When the valve is closed, the closing signal is output.

Smoke exhaust fire damper

It is installed on the pipeline of the smoke exhaust system. It is generally open at ordinary times. In case of fire, it is opened manually or electrically for smoke exhaust. When the flue gas temperature in the smoke exhaust pipe reaches 280 ℃, it is closed, which can meet the requirements of fire stability and fire integrity within a certain time, and plays the role of smoke exhaust.

Product principle

Installed in the air duct system of central air conditioning, the working principle is the temperature control of extremely fusible alloy, and the valve is closed by gravity and spring mechanism. When a fire occurs, the flame invades the air duct, and the high temperature melts the fusible alloy on the valve, or deforms the memory alloy to make the valve close automatically. It is used for occasions where the air duct and fire compartment run through.

Product classification

Fire damper

1. The fire damper is normally open and closed at 70 ℃. It is generally installed at the place where the air duct passes through the firewall and plays the role of fire shutdown. It can be set with output electric signal. When the temperature exceeds 70 ℃, the valve is closed and the linkage supply (make-up) fan is closed;

2. The smoke and fire control valve is normally open and closed at 70 ℃, the same as 1. However, one more electric signal input can be remotely controlled and closed by the fire control room. It is generally used in the common air duct system of air supply and fire air supplement at ordinary times. In case of fire, it can control and close the room that does not need air supplement;

3. Normally open smoke exhaust fire damper, which is fused and closed at 280 ℃, normally open and outputs electric signal. This is similar to 1, but the fusing temperature is different. It is generally used at the place where the fire smoke exhaust pipe passes through the firewall. When the smoke temperature exceeds 280 ℃, it will be automatically fused and closed, and the smoke exhaust fan can be closed in linkage.

Smoke exhaust valve

1. Normally closed smoke exhaust fire damper (normally closed, open by electric signal, closed by fusing at 280 ℃, or closed manually) is generally used in smoke exhaust system. One can be installed at the suction inlet of smoke exhaust fan. In case of fire, it can be opened under the control of fire control room, and the smoke exhaust fan can also be interlocked and closed when closed.

2. Smoke exhaust valve is different from the above 3. Some units are called smoke exhaust valve according to its action temperature, and some are called fire damper according to its purpose and nature. However, the equipment side only changes the fusing metal of ordinary fire damper to the one fusing at 280 ℃.

3. Full automatic smoke exhaust fire damper (for Subway Engineering) the fire and smoke exhaust valves of subway ventilation and air conditioning system have the function of linkage control with automatic fire alarm equipment and gas fire extinguishing system. Each full-automatic smoke and fire damper has two independent electric control signals, which are monitored by EMCS and gas elimination system respectively. The control signals are DC24V ± 10%. Each full-automatic smoke and fire damper has six independent feedback signals (three open in place and three closed in place). The feedback signals are normally open passive contact signals.

Smoke exhaust outlet

If you install the necessary smoke exhaust valve on the pipeline, use the ordinary single-layer louver air outlet; Otherwise, a plate type smoke exhaust outlet is required, which is also equipped with a mechanism of smoke exhaust fire damper.

Key points of selection

● 1. The main control parameters of fire damper are specification, etc.

● 2. The fire damper is applicable to ventilation and air conditioning system. Except that the fire damper for kitchen fume exhaust system of public buildings has an operating temperature of 150 ℃, the operating temperature of fire damper for general ventilation and air conditioning system is 70 ℃.

● 3. The fire damper is applicable to the pipeline of ventilation, air conditioning or smoke exhaust system.

● 4. When selecting the valve, pay attention to the function of the valve, such as normally open or normally closed, automatic closing and opening, manual closing and opening, manual reset, signal output, remote control and other requirements.

● 5. If the valve is linked with the fan, the device with double microswitch shall be selected.

● 6. The valve body blade shall be steel plate with a thickness of 2 ~ 6mm. The valve body shall be made of non combustible materials. The rotating parts shall be made of corrosion-resistant metal materials and rotate flexibly. The shell thickness of the valve shall not be less than 2mm. Fusible parts shall meet the standards approved by the fire department.