Air volume control valve is an indispensable central air-conditioning terminal fitting in ventilation, air conditioning and air purification engineering of industrial workshops and civil buildings. It is generally used in air-conditioning and ventilation system pipes to adjust the air volume of branch pipes, and can also be used for mixed adjustment of fresh air and return air.

Air valves commonly used in ventilation and air conditioning systems are divided into four categories: manual control valves, electric control valves, smoke-proof fire valves and smoke-exhaust fire valves.

Classification and function of air valve

1. Manual control valve

At present, the multi-leaf regulating valve is widely used in engineering. Its function is to manually adjust and distribute the air volume of the branch pipes of the air duct system, and it can meet the requirements of the air volume distribution of the system only through the initial balance adjustment without remote control. Its application is relatively simple.

2. Electric regulating valve

Installed on the air duct of air conditioning and ventilation system, it is used to adjust the air volume of branch pipes, and can also be used for mixed adjustment of fresh air and return air. The valve is electrically opened or closed, and the opening and closing electric signals are output. It is matched with the automatic control system to automatically control and adjust the air volume. The electric actuator shall have the functions of remote electric control and on-site manual control, and be equipped with manual/electric operation change-over handle, mechanical and electrical limit devices, and have the functions of electric control start-stop, manual/automatic change-over, fault alarm, start-stop state feedback, etc.

3. Smoke and fire dampers

Installed on the air supply and return duct of ventilation and air conditioning system, it plays the role of smoke prevention and fire prevention.

Usually it is divided into two types: electric type and manual type. The same point is that it is normally open when working at ordinary times, the fuse closing temperature is 70℃, and the opening of the air valve can be adjusted. The difference is the action mode and the reset mode. In the electric type, the electromagnet in the actuator is energized by the input electric signal (DC24V), and the valve is automatically closed. Manual type is manual closing or 70℃ fuse action closing.

According to its use, it can be divided into fire valve and fire control valve. The same point is that it is blown.

The closing temperature is 70℃, and general products can be closed manually. The difference is that the fire control valve is used in the air duct system which has fire protection requirements and needs to adjust the air volume, and has the functions of manual shutdown, manual reset, electric shutdown, electric reset, electric signal input and output and fan interlocking.

4, smoke fire damper

The smoke exhaust fire damper is installed in a separate smoke exhaust system or a system with both exhaust and smoke exhaust. It normally works in a normally open state, and is fused and closed when the smoke temperature in the pipeline reaches 280℃ in case of fire.

Generally, it can be divided into three types: normally open electric type, normally open manual type and normally closed electric type, all of which can output closing electrical signals and start interlocking. The closing temperature of fuse is 280℃, and the opening of air valve can be adjusted. The difference is the action mode and the reset mode. In the electric mode, when a fire occurs, the DC24V electric signal is input, the electromagnet in the actuator is energized to act, and the valve is automatically closed. Manual type is manual closing or valve fuse closing when smoke temperature reaches 280℃. Normally-open type is used for exhaust and smoke extraction system or smoke extraction system with multiple smoke prevention zones. Normally-open electric type is only suitable for remote control by automatic control system. Normally closed type is used for separate smoke exhaust system, and normally closed electric type is generally used in situations that need to be remotely controlled by automatic control system or interlocked with fans. In the specific application, the normally open and normally closed setting requirements of the smoke exhaust fire damper also depend on the form of the smoke exhaust port. If the smoke outlet is normally closed, it should be provided with a normally open smoke exhaust fire damper; if the smoke outlet is normally open, it should be provided with a normally closed smoke exhaust fire damper; if the smoke outlet is provided with a special smoke outlet with a fire damper, there will be no smoke exhaust fire damper on the smoke exhaust branch pipe.

Air volume control valve interface, working principle and maintenance.

Air volume control valve interface

Interface between environmental equipment monitoring system (BAS) and HVAC professional electric air volume control valve equipment (TFJ): The environmental equipment monitoring system controls and monitors the electric air volume control valve. Electric air volume control valve equipment is also used in fire conditions. In case of fire, FAS sends a fire mode command to BAS, and BAS performs fire linkage control on TFJ.

Interface between gas fire extinguishing system (QM) and HVAC professional electric regulating valve (TFJ): Control and monitoring of gas fire extinguishing system (QM) and electric regulating valve. In case of fire, QM sends a fire alarm signal to FAS, and QM performs fire linkage control on TFJ.

Interface between fire alarm system (FAS) and electric smoke exhaust equipment (SEG) of HVAC specialty: FAS controls SEG interface and SEG status feedback signal.

Interface between fire alarm system (FAS) and HVAC professional electric fire damper equipment and manual fire damper equipment: control and feedback of FAS to electric fire damper equipment and manual fire damper equipment.

Interface between power lighting specialty and HVAC specialty system: to meet the electrical load requirements of equipment in HVAC specialty.

Air volume control valve's working principle

1. Main structural features:

The frame is made of 2mm galvanized steel plate and welded after cold rolling.

The blade is made of 1.0mm galvanized steel plate by cold rolling and double-layer spot welding, which has good corrosion resistance;

Oil-bearing sintered bronze bearing is installed between the blade shaft and the frame, so the friction torque is small and maintenance is not needed;

The action mode of blades is split, which can be adjusted steplessly, and its flow characteristics are equal percentage;

High-temperature-resistant elastic rubber is used as sealing material between blades and ends, and the service temperature is 280℃/90min.

Driving mode: manual, electric and pneumatic.

2. Working environment: temperature -10~+70℃

Special temperature 250℃/60min

Relative humidity ≤98%

Noise requirement: ≤45dB(A)

3, using environmental conditions:

Normal operation: it can run continuously and normally at the temperature of 0℃~45℃ and the relative humidity of 10%~98%.

Accident operation: For example, the air valve used in the station tunnel ventilation system and the station ventilation and air conditioning smoke exhaust system can run continuously and effectively for 1 hour under the high temperature smoke flow of 250℃.

Storage conditions: temperature 0℃~45℃ and relative humidity 10%~98%.

Withstand pressure: ≥1200Pa

4. Structural characteristics of main components: The overall structure of single air valve is mainly composed of frame, blades, transmission mechanism and other components. If the control system fails, it can be adjusted manually through the manual attachment of the actuator.

5. Maintenance and maintenance of air volume control valve:

In order to ensure the long-term stable operation of the equipment, it must also be maintained regularly, and the maintenance period is three months. Maintenance contents are as follows:

(1) Remove surface dust and sundries;

(2) Check whether the electric and manual actuators are sensitive;

(3) Check whether the transmission rod is loose;

(4) Check whether the air valve is in place.

Working principle of fire valve

1. Introduction of fire damper:

Fire dampers must pass the national fixed fire extinguishing system and fire-resistant component quality supervision and inspection center and the strict inspection products with 3C certification; (3C certification can be found in HVAC South Society, 021-56795109)

It has the characteristics of firm structure, flexible action and reliable performance, which can meet the requirements of different ventilation areas, different wind pressures, ambient temperature and humidity, with smooth appearance and convenient transportation, installation and disassembly;

Fire dampers are connected by standard flanges, and square or round nozzles can be selected at both ends to meet the needs of various air duct connections;

The installation method can be horizontal installation, vertical installation or wall-mounted installation.

Air volume control valve is an indispensable central air-conditioning terminal fitting in ventilation, air conditioning and air purification engineering of industrial workshops and civil buildings. It is generally used in air-conditioning and ventilation system pipes to adjust the air volume of branch pipes, and can also be used for mixed adjustment of fresh air and return air.

Air valves commonly used in ventilation and air conditioning systems are divided into four categories: manual control valves, electric control valves, smoke-proof fire valves and smoke-exhaust fire valves.

Classification and function of air valve

1. Manual control valve

At present, the multi-leaf regulating valve is widely used in engineering. Its function is to manually adjust and distribute the air volume of the branch pipes of the air duct system, and it can meet the requirements of the air volume distribution of the system only through the initial balance adjustment without remote control. Its application is relatively simple.

2. Electric regulating valve

Installed on the air duct of air conditioning and ventilation system, it is used to adjust the air volume of branch pipes, and can also be used for mixed adjustment of fresh air and return air. The valve is electrically opened or closed, and the opening and closing electric signals are output. It is matched with the automatic control system to automatically control and adjust the air volume. The electric actuator shall have the functions of remote electric control and on-site manual control, and be equipped with manual/electric operation change-over handle, mechanical and electrical limit devices, and have the functions of electric control start-stop, manual/automatic change-over, fault alarm, start-stop state feedback, etc.

3. Smoke and fire dampers

Installed on the air supply and return duct of ventilation and air conditioning system, it plays the role of smoke prevention and fire prevention.

Usually it is divided into two types: electric type and manual type. The same point is that it is normally open when working at ordinary times, the fuse closing temperature is 70℃, and the opening of the air valve can be adjusted. The difference is the action mode and the reset mode. In the electric type, the electromagnet in the actuator is energized by the input electric signal (DC24V), and the valve is automatically closed. Manual type is manual closing or 70℃ fuse action closing.

According to its use, it can be divided into fire valve and fire control valve. The same point is that it is blown.

The closing temperature is 70℃, and general products can be closed manually. The difference is that the fire control valve is used in the air duct system which has fire protection requirements and needs to adjust the air volume, and has the functions of manual shutdown, manual reset, electric shutdown, electric reset, electric signal input and output and fan interlocking.

4, smoke fire damper

The smoke exhaust fire damper is installed in a separate smoke exhaust system or a system with both exhaust and smoke exhaust. It normally works in a normally open state, and is fused and closed when the smoke temperature in the pipeline reaches 280℃ in case of fire.

Generally, it can be divided into three types: normally open electric type, normally open manual type and normally closed electric type, all of which can output closing electrical signals and start interlocking. The closing temperature of fuse is 280℃, and the opening of air valve can be adjusted. The difference is the action mode and the reset mode. In the electric mode, when a fire occurs, the DC24V electric signal is input, the electromagnet in the actuator is energized to act, and the valve is automatically closed. Manual type is manual closing or valve fuse closing when smoke temperature reaches 280℃. Normally-open type is used for exhaust and smoke extraction system or smoke extraction system with multiple smoke prevention zones. Normally-open electric type is only suitable for remote control by automatic control system. Normally closed type is used for separate smoke exhaust system, and normally closed electric type is generally used in situations that need to be remotely controlled by automatic control system or interlocked with fans. In the specific application, the normally open and normally closed setting requirements of the smoke exhaust fire damper also depend on the form of the smoke exhaust port. If the smoke outlet is normally closed, it should be provided with a normally open smoke exhaust fire damper; if the smoke outlet is normally open, it should be provided with a normally closed smoke exhaust fire damper; if the smoke outlet is provided with a special smoke outlet with a fire damper, there will be no smoke exhaust fire damper on the smoke exhaust branch pipe.

Air volume control valve interface, working principle and maintenance.

Air volume control valve interface

Interface between environmental equipment monitoring system (BAS) and HVAC professional electric air volume control valve equipment (TFJ): The environmental equipment monitoring system controls and monitors the electric air volume control valve. Electric air volume control valve equipment is also used in fire conditions. In case of fire, FAS sends a fire mode command to BAS, and BAS performs fire linkage control on TFJ.

Interface between gas fire extinguishing system (QM) and HVAC professional electric regulating valve (TFJ): Control and monitoring of gas fire extinguishing system (QM) and electric regulating valve. In case of fire, QM sends a fire alarm signal to FAS, and QM performs fire linkage control on TFJ.

Interface between fire alarm system (FAS) and electric smoke exhaust equipment (SEG) of HVAC specialty: FAS controls SEG interface and SEG status feedback signal.

Interface between fire alarm system (FAS) and HVAC professional electric fire damper equipment and manual fire damper equipment: control and feedback of FAS to electric fire damper equipment and manual fire damper equipment.

Interface between power lighting specialty and HVAC specialty system: to meet the electrical load requirements of equipment in HVAC specialty.

Air volume control valve's working principle

1. Main structural features:

The frame is made of 2mm galvanized steel plate and welded after cold rolling.

The blade is made of 1.0mm galvanized steel plate by cold rolling and double-layer spot welding, which has good corrosion resistance;

Oil-bearing sintered bronze bearing is installed between the blade shaft and the frame, so the friction torque is small and maintenance is not needed;

The action mode of blades is split, which can be adjusted steplessly, and its flow characteristics are equal percentage;

High-temperature-resistant elastic rubber is used as sealing material between blades and ends, and the service temperature is 280℃/90min.

Driving mode: manual, electric and pneumatic.

2. Working environment: temperature -10~+70℃

Special temperature 250℃/60min

Relative humidity ≤98%

Noise requirement: ≤45dB(A)

3, using environmental conditions:

Normal operation: it can run continuously and normally at the temperature of 0℃~45℃ and the relative humidity of 10%~98%.

Accident operation: For example, the air valve used in the station tunnel ventilation system and the station ventilation and air conditioning smoke exhaust system can run continuously and effectively for 1 hour under the high temperature smoke flow of 250℃.

Storage conditions: temperature 0℃~45℃ and relative humidity 10%~98%.

Withstand pressure: ≥1200Pa

4. Structural characteristics of main components: The overall structure of single air valve is mainly composed of frame, blades, transmission mechanism and other components. If the control system fails, it can be adjusted manually through the manual attachment of the actuator.

5. Maintenance and maintenance of air volume control valve:

In order to ensure the long-term stable operation of the equipment, it must also be maintained regularly, and the maintenance period is three months. Maintenance contents are as follows:

(1) Remove surface dust and sundries;

(2) Check whether the electric and manual actuators are sensitive;

(3) Check whether the transmission rod is loose;

(4) Check whether the air valve is in place.

Working principle of fire valve

1. Introduction of fire damper:

Fire dampers must pass the national fixed fire extinguishing system and fire-resistant component quality supervision and inspection center and the strict inspection products with 3C certification; (3C certification can be found in HVAC South Society, 021-56795109)

It has the characteristics of firm structure, flexible action and reliable performance, which can meet the requirements of different ventilation areas, different wind pressures, ambient temperature and humidity, with smooth appearance and convenient transportation, installation and disassembly;

Fire dampers are connected by standard flanges, and square or round nozzles can be selected at both ends to meet the needs of various air duct connections;

The installation method can be horizontal installation, vertical installation or wall-mounted installation.