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译文：
　　 定风量阀，是一种机械式自力装置，适用于需要定风量的通风空调系统中。定风量阀风量控制不需要外加动力，它依靠风管内气流力来定位控制阀门的位置，从而在整个压力差范围内将气流保持在预先设定的流量上。 (一)在新风系统中的应用 目前，在国内，风机盘管加新风系统的空调方式还是较普遍，尤其是宾馆客房部分，大部分写字楼、办公楼都采用这种方式。通常做法是每层设新风机组，走道敷设新风干管，几十根支管分别从总管上接入各房间。以宾馆客房为例，每间客房新风量一般为100 m3/h，如何做到各支管的风量一致呢？一般来说，设计师往往会在新风支管上加设一只风量调节阀，期望通过后期调试手段来完成风量分配。由于新风系统一般情况下均为干管长，支管短，而风量调节阀调节既不直观，调节精度又不理想，况且每间客房新风量只有100 m3/h，风量很小，这样的调试几乎是无法完成的。施工单位只能做到测一下新风干管的总送风量，保证各送风支管有风感这样的地步。为了能保证各房间所送新风量能达到设计值，也无需施工单位再去一个房间一个房间的平衡，我们只需在每支新风支管上加设一只定风量阀，以上问题就迎刃而解。 在高层建筑内居住、办公的人常常抱忧新风量不足，而设计师往往感到很委屈。因为从图纸上看，新风量标准的取值并不低，但我们往往忽略了一个问题，如何从设计角度来保证实际效果，而定风量阀在新风系统中的应用，就是一个有力的措施。 因目前定风量阀主要还是依靠进口，价格较贵，笔者建议在四、五星级宾馆，xx写字楼运用比较合适。 (二)在排风系统中的应用 一个好的空调系统设计，它的排风系统必须很合理，而这一点往往得不到重视。在民用建筑特别是在高层建筑里，围护结构的气密性很好，只需较少的风量就可以维护房间的正压值。大约新风量的85～90%必须通过有组织的排风排出室外，这样才能保证送风、排风的风量平衡，否则再多的新风量也无法送进房间。在民用建筑里，排风一般通过卫生间、开水间等辅助用房排出室外。除此之外，有时还应再增加一套排风系统，才能保证送、排风平衡。对于卫生间排风，通常做法是每间卫生间设一、二只卫生间通风器，与排风竖井上的排风机联锁。我们知道，高层建筑内新风系统应该是一年四季都运行的，相应排风系统也应该是一年四季都运行的。也就是说，使用卫生间的人不可以去控制卫生间通风器的开启，设卫生间通风器的必要性就没有了。况且一个大风机带几十个小风机这样的排风系统运行既难匹配，又不经济。排风量为400m3/h的卫生间通风器噪音就有40dB左右，使卫生间失去宁静。大量的卫生间通风器也给维护带来很xxx烦。为解决这个问题，我们可以取消卫生间通风器，在排风竖井每层支管上加设一只定风量阀，竖井顶部设一只排风机。这样的排风系统，能保证各层所排风量大致相等，而系统控制简单，运行可靠，卫生间可以很宁静。 (三)在变风量空调系统中的应用 在变风量空调系统中，一般外区采用变风量方式，内区采用定风量方式，在一个风量、风压不断变化的送风系统中，内区定风量设计是离不开定风量阀的。 (四)在净化空调系统中的应用 在净化空调系统中维持洁净房间的正压值至关重要，在排风或送排风系统中加设定风量阀，就能有效保证洁净房间的正压值。 洁净手术室手术进行时与不进行时均需保持手术室正压，手术进行时新风量为保证正压所需的新风量加人员所需新风量，手术不进行时新风量为只保证正压所需的新风量，所以新风管上需要设双位定风量阀。 (五)在风管管路平衡上的应用 在全空气系统中，由于受建筑条件的影响，各支管之间阻力肯定不均衡，一般采用三通调节阀或对开多叶调节阀来完成风量分配。为保证重要房间或主要支管上的风量不致于过大或过小，减少调试的盲目性，可适当加设定风量阀来取代三通调节阀或对开多叶调节阀。 (六)定风量使用上的特点 定风量阀是自动机械机构，无需外部动力，可另加电动执行器通过遥控信号改变流量设定。定风量阀在送、排风系统中均可应用，工作温度一般为10～50℃，压差范围为50～1000Pa，即阀前阀后至少应用50Pa压差，否则定风量阀不能工作。这点应注意，因为新风系统新风机组的风压值一般都不大。定风量阀安装时不受位置限制，但阀片轴应保证水平，一般要求有阀门长边1.5倍距离的直线入口风管及0.5倍距离的直线出口风管。定风量阀控制精度高，有外部指针显示流量刻度，调节精度约为±4%，限流机构无需维护，为与系统配套，定风量阀矩形、圆形、保温、消声型均可选择。 正如平衡阀在空调水系统中越来越被广大设计师所采用一样，定风量阀由于它能xx可调，自动平衡的特点，也将会在送、排风系统中得到了广泛运用。 　　

“ Fixed air flow valve in the ventilation and air conditioning system of”是由提供的国际阀门新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：、、、、等。

原文：
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.