The fixed air valve is a mechanical self force device, which is suitable for the ventilation and air conditioning system which needs the fixed air volume. The air volume control of the constant air volume valve does not need additional power. It relies on the air force in the duct to locate the position of the valve, so that the airflow is maintained at the preset flow in the range of the whole pressure difference.
Application in the new wind system
At present, the air conditioning system of fan coil unit plus fresh air system is quite common in China, especially in the guest rooms section. Most office buildings and office buildings adopt this way. The usual practice is to set up a new wind unit in each layer, and a new wind pipe is laid on the aisle, and dozens of branches are connected to each room separately from the general pipe.
Application in exhaust system
A good air conditioning system design, its exhaust system must be very reasonable, and this is often not paid attention. In civil buildings, especially in high-rise buildings, the tightness of the enclosure structure is very good, and the positive pressure of the room can be maintained only with less air volume. About 85 to 90% of the fresh air volume must be discharged through the organized exhaust, so as to ensure the air volume balance of the air supply and exhaust. Otherwise, no more fresh air volume can be delivered to the room. In civil buildings, the exhaust air is usually discharged through the auxiliary rooms such as toilet, open water room and other auxiliary rooms.
In the whole air system, due to the influence of building conditions, the resistance between the branches must be unbalanced. Generally, the three way regulating valve or the multi leaf regulating valve are used to complete the air volume distribution. In order to ensure that the air volume of the main room or main branch is not too large or too small, and reduce the blindness of the commissioning, we can set up the air volume valve to replace the three way regulating valve or the multi leaf regulating valve.