Air valve refers to the air volume air valve, which is an indispensable air conditioning terminal accessory in the ventilation, air conditioning, and air purification engineering of industrial and civil buildings. It is generally used in air conditioning, ventilation system pipes, to regulate the air volume of branch pipes, and can also be used for mixed regulation of fresh air and return air. Below is a brief introduction to classification and principles

Opposed closed multi blade air valve

It can be divided into two types: pneumatic and electric. Due to the use of split blades, the air flow is relatively uniform. Manual connecting rods can be used to drive the blades to rotate, adjust the flow through the air flow, and together, it can be closed to prevent the air flow from passing through. Due to the sealing strip embedded in the edge of its blade, it can ensure its tightness during sealing, with advantages such as low resistance and small air leakage.

The multi leaf air valve is installed on the main air duct and the branch air duct, and the electric multi leaf air valve is an electric actuator installed on the main shaft of the air valve drive. When the power is turned on, the actuator pointer orientation is adjusted so that it can rotate clockwise and counterclockwise, and the connected valve blades on the main shaft are driven to open and close.

When the manual unloading button on the actuator is pressed, the manual air valve blade can also be turned from fully closed to fully open. The multi leaf air valve with electric actuator is installed at the air inlet of the fresh air fan matching the air conditioner in the fine machine room, and the power line is interlocked with the motor of the fan in the unit,

That is, when the unit fan is shut down, its fresh air pipeline valve is also in a closed state. During winter operation, it will be avoided that cold air enters the unit to freeze the water in the heat exchanger due to the shutdown of the fresh air fan. In addition, after a fire occurs in the building, the fire control device actively cuts off the power supply of the fan, preventing outdoor air from entering the air duct and increasing the fire. There are many specifications for multi leaf air valves, which are generally installed on the air duct and have the same cross-sectional dimensions as the air duct. When using a manual multi blade air valve to adjust the air volume, adjust and open its blades to a certain angle, and then use a lock nut to fix it. Electric actuators should be products with small size, large torque, high control accuracy, high reliability, and convenient installation.

butterfly valve

The butterfly valve has a simple structure and convenient operation, which plays a role of opening and closing or regulating the air volume. However, due to its large opening resistance, the blade air valve is usually installed on the branch air duct entering the air conditioning of the fine machine room. According to the structure, butterfly valves have two types: zipper type and handle type.

Triple vent valve

The three-way vent valve is mainly used at rectangular straight tee pipes or trouser fork pipes, and can adjust the air volume of branch pipes. There are two types of three-way vent valves: handle type and pull rod type.

Plug valve

Plug valve is mostly used at the outlet of centrifugal fans as a starting valve for fans, also known as plug start valve. Due to high opening resistance, it is rarely used in ventilation and air conditioning pipelines.