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.

　　在新風系統(tǒng)中的應用

　　Application in the new wind system

　　目前，在國內，風機盤管加新風系統(tǒng)的空調方式還是較普遍，尤其是賓館客房部分，大部分寫字樓、辦公樓都采用這種方式。通常做法是每層設新風機組，走道敷設新風干管，幾十根支管分別從總管上接入各房間。

　　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.

　　在排風系統(tǒng)中的應用

　　Application in exhaust system

　　一個好的空調系統(tǒng)設計，它的排風系統(tǒng)必須很合理，而這一點往往得不到重視。在民用建筑特別是在高層建筑里，圍護結構的氣密性很好，只需較少的風量就可以維護房間的正壓值。大約新風量的85～90%必須通過有組織的排風排出室外，這樣才能保證送風、排風的風量平衡，否則再多的新風量也無法送進房間。在民用建筑里，排風一般通過衛(wèi)生間、開水間等輔助用房排出室外。

　　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.

　　在全空氣系統(tǒng)中，由于受建筑條件的影響，各支管之間阻力肯定不均衡，一般采用三通調節(jié)閥或對開多葉調節(jié)閥來完成風量分配。為保證重要房間或主要支管上的風量不致于過大或過小，減少調試的盲目性，可適當加設定風量閥來取代三通調節(jié)閥或對開多葉調節(jié)閥。

　　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.