Fixed air flow valve is a mechanical self-device applications that require fixed air flow ventilation and air conditioning systems. Scheduled air volume air flow control valve does not require external power, it relies on the wind pipe air force to locate the control valve position, and thus the entire range of pressure difference will be maintained at pre-set air flow on.
(A) in the new Air System
At present, in China, fan-coil air-conditioning and fresh air systems approach is still more common, particularly in some hotel rooms, most office buildings, office buildings have adopted this approach. Common practice is to set up a new air handling units on each floor, walkways, air-dried to lay new pipes, dozens of the root branch pipe from the mains, respectively, on access to each room. To hotel room, for example, each room air quantity is usually 100 m3 / h, how to do each branch pipe air flow are consistent? In general, designers tend to be in the new air branch pipe installing an air volume control valve, hoping to accomplish by means of the latter part of debugging air volume distribution. Since the new ventilation system under normal circumstances are dry tube length, short branch pipes, while the air volume control valve adjustment is neither intuitive, regulation accuracy is not satisfactory, Moreover, each room air quantity is only 100 m3 / h, air flow is very small, so debugging is almost can not be completed. Construction unit can do about a new measurement of the total air-dry air supply pipes to ensure that the air supply branch pipes sense of such a point where the wind. In order to ensure that all rooms are air quantity can be sent to meet the design values, and need a room in a construction unit Zaiqu room balance, we need only each new wind branch pipe installing a fixed air flow valve, the above problem is solved.
In high-rise residential buildings, office often holds worry about lack of fresh air volume, while designers often feel very aggrieved. Because from the drawing point of view, the values of ventilation rate standards are not low, but we tend to overlook a problem, how to design point of view to ensure that the actual results and fixed air flow valve in the fresh air system, the application is an effective measure.
Because there is currently scheduled to air volume valves mainly rely on imports more expensive, I suggest four or five-star hotels, high-grade office buildings to use more appropriate.
(B) Exhaust System
A good air-conditioning system design, and its ventilation system must be very reasonable, and this is often not given due attention. In the civil construction, particularly in high-rise building, the envelope of air tightness good, just less air flow can maintain the room pressure value. Approximately 85 ~ 90% of the volume of outdoor air must be exhausted to the outside through the exhaust organized, so as to ensure the air supply, exhaust air flow balance, otherwise no amount of fresh air rate can not be sent to the room. In the civil construction, the ventilation in general through the toilet, drinking water and other auxiliary space between the exhaust outdoors. In addition, sometimes a ventilation system should be further increased in order to guarantee delivery, exhaust balance. For the bathroom ventilation, common practice is to set up one for each bathroom, two bathroom ventilators, exhaust and ventilation shaft on the machine interlock. We know that high-rise buildings fresh air system should be run throughout the year, the corresponding ventilation system should be run throughout the year. In other words, people can not use the bathroom toilet ventilator to control the opening, located toilet ventilator, there is no need to. Moreover, a large fan with dozens of such a small exhaust fan system is running both difficult to match, and uneconomical. Exhaust capacity of 400m3 / h of the toilet ventilators have 40dB noise around, so that loss of a quiet toilet. A large number of bathroom ventilators also bring great trouble to maintain. To address this problem, we can cancel the bathroom ventilators, ventilation shaft on each floor in the addition of a branch pipe fixed air volume valves, shaft at the top of an exhaust fan is located. This ventilation system to ensure that roughly equal the amount of each layer of the exhaust, while the control system is simple, reliable, and the bathroom can be very quiet.
(C) VAV System
In the variable air volume air conditioning system, generally outside the area will adopt the variable air volume mode set air volume within the area will adopt the way, in a wind, air pressure changing the air supply system, air volume within the areas as set design is inseparable from the air flow valve.
(D) in the purification of air-conditioning system
In the clean air-conditioning system to maintain the value of critical pressure clean room, in the exhaust ventilation system or to send Canada to set air flow valve, can effectively guarantee the value of positive pressure clean room.
Clean operating room with surgery without positive pressure when required to keep the operating room, surgery to ensure positive pressure when the volume of outdoor air quantity needed to add the required volume of outdoor workers, surgery without positive pressure when the volume of outdoor air to only guarantee the required volume of outdoor air, the new air duct on the need to set up a double-digit fixed air volume valves.
(E) in the wind pipe on the application of balanced
In the entire air system, due to construction conditions, the impact of resistance among the various branch tube is certainly not balanced, generally use the three-way valves or a multi-leaf off the air flow control valve to complete the distribution. To ensure that important room or the main branch pipe on the amount of wind Buzhi Yu is too large or too small, to reduce debug blindness, may be appropriate to increase air flow valves set to replace the three-way valves or a multi-leaf off the valve.
(6), will feature the use of air volume
Fixed air flow valve is automatic machinery bodies, no external power, plus the electric actuator can be by remote control signal to change the flow settings. Fixed air flow valve in the delivery, ventilation systems can be applied, the working temperature is generally 10 ~ 50 ℃, pressure range of 50 ~ 1000Pa, the valve before the valve at least 50Pa differential pressure applications, or fixed air flow valve does not work. This point should be noted that, as the new air system air pressure value of fresh air units are generally not large. Fixed air flow valves installed regardless of location restrictions, but should ensure that the level of valve shaft, generally require a long side of the valve straight-line distance of 1.5 times and 0.5 times the duct entrance of a straight line from the exit duct. Fixed air flow valve control, high precision, scale external pointer shows flow to regulate the accuracy is about ± 4%, limiting not required to maintain, for matching with the system scheduled to air volume valves rectangular, circular, insulation, muffler type may choose.
As the balancing valve in the air-conditioning water system is increasingly being used by the general designer, as scheduled air volume valves because that is precisely adjustable, self-balancing features will also be in the delivery, exhaust system has been widely used.
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