译文：
在集中供热或中央空调的循环水管网系统中，普遍存在着水力失调问题，由于各个环路之间不同的阻力和耦合的关联关系，导致流量的输配难以均衡，调控困难，由此造成系统运行品质差，流量调控不准确不稳定，用户端冷热不均，被迫采用大流量运行，能源浪费严重等诸多问题。其主要原因是使用了质量差不可靠、使用方法简便、造价低廉的流量调控设备。 恒流量调节阀是专为克服上述问题而研发的专用调控设备，它能准确可靠地进行流量的调控和输配，根除水力失調问题。集中供热或中央空调的循环水管网系统中，恒流量调节阀安装在用户端的各个环路上，按各用户的额定流量设定开度，即可实现整个管网系统的均衡输配，保证系统流量输配的均衡和稳定，提高运行品质，实现节能运行。无需专门的调试技术和仪表，调节设定简便直观，快速可靠。在集中供热的一次水或中央空调的楼宇自控系统中，配装阀门执行器的恒流量调节阀可以保证系统流量的调控稳定自如、准确可靠，提高运行品质，减少阀门执行器的动作次数并延长其使用寿命。 据有关资料表明，在集中供热系统中，合理均衡的输配流量，实现水力平衡后,可以节电、节煤各15-20%以上，折合每个采暖季每平米建筑面积降低运行费用0.5元以上；由于解决了供热管网流量输配不均衡的问题，使长期不热的末端用户室温达标，既能减少用户投诉，也能提高收费率，同时还可以充分发挥现有锅炉水泵的能力，扩大供热供暖的面积，经济效益和社会效益非常可观。 恒流量调节阀 恒流量调节阀是具有恒流量功能的调节阀，它是将自力式的压差控制装置和流量调节装置组合而成的阀门，其工作原理是：用压差控制装置，控制并稳定流量调节装置前后的压差，从而使阀门前后的压差大于恒流启动值之后，通过的流量不再随着阀门前后的压差而变化，在压差控制的范围内，通过阀门某一开度的流量能够自动保持恒定，流量的变化只需调节阀门开度即可实现，与阀门前后的压差无关。 同一工作原理的阀门有的称为“动态平衡阀”，有的称为“自力式流量控制器”或“自力式流量调节（控制）阀”，它们都具有一定的恒流量功能，但在调节范围，结构体积、可维护性，材质和价格等方面差别较大。 北京天箭星机电技术有限公司研发的恒流量调节阀，2000年获中国实用新型专利，(专利号:99217435)，2001年通过国际专利合作组织（PCT）的国际检索和国际初审，已获准申请德国、美国的专利和中国的发明专利，正在审批过程中。 恒流量调节阀具有以下特征 ： 1.传统的外形，与普通调节阀类似。 2.调节范围宽，一般为1：10，{zd0}可达1：20，xx可以满足用户调节的需求。 3.压差控制范围大，损失的压头{zd0}可达45米，最小为2~3米。 4.采取外联接取压方式即可成为“具有恒定{zd0}流量功能的压差控制阀” 5.内部零件同轴安装，可配装各种品牌的角行程阀门执行器。 6.套筒式双座阀瓣，为国际xx。 7.采用金属波纹管作为感压元件，可靠性高，使用寿命长。 8.上部可拆卸的结构，便于维护清理。 选择阀门的公称通径时，先根据阀门所供的建筑面积、用户的热指标、管网提供的供回水温差等数据进行计算，确定其设定流量；再根据表一所列的流量控制范围选择阀门的公称通径，注意阀门的设定流量{zh0}在选型流量范围内，以保证足够的调节余量。 由于恒流量调节阀可调范围较宽，阀门口径一般可按设计管径选取，必要时可缩径。 安装位置 在集中供热系统中，装在各个换热器一次水的出口或入口(图一a)，实施手动调节；也可安装阀门执行器、温度传感器、气候补偿器和其它自控仪表实施自动控制； 在集中供热的室外系统中，装在各个建筑热力入口的回水管上或供水管上； 在中央空调的风机盘管系统中，装在楼层的分支处和各个空调机组的盘管入口处的回水管上或供水管上；也可安装阀门执行器配合自控仪表实施自动控制。 在未安装温控阀的分户控制系统中，可装在每户入口回水管上；在安装温控阀分户控制的系统中必须采用外联接取压方式（需特殊定货），装在各个建筑的热力入口的供水管上或各个单元共用立管的供水管上；注意将外联接的取压管接在回水管上；每个独立的环路上装一个，不必重复串联使用。 调节方法 先用呆扳手松开手轮下面的压兰，在刻度盘上查找与设定流量相对应的流量刻度值，将阀门设定到这个刻度，再拧紧压兰即可。在自动控制系统中，恒流量调节阀可安装角行程阀门执行器，自动调节流量。在分户热计量的系统中，用户可以自主调节开度，改变设定流量，既可满足不同的室温要求，也可实现行为节能，降低热费。 技术指标 工作压差：0.02 MPa – 0.45MPa ； 工作温度：4℃-130℃； 工作压力：1.6 MPa ； 相对误差：8 % ； 常见故障及排除方法： 不明故障原因及排除， 具体操作方法：振动、 积气 、排气 、将阀轴压兰拧松，出水之后再拧紧即可。 流量不足或排污 ，将手轮左右反复轻轻旋转，直到旋转一圈以上，受卡阻为止；也可将下盖或丝堵拆下排污。 流量失控 、污物堵塞 、 清理 ：将上盖螺栓拆下，将手轮和上盖一同向上提起取出，清理之后装回，注意刻度盘上的商标朝向阀门进口，不要装错。 注意事项 注意保持水质清洁；注意阀门上的箭头方向与水流方向一致，不得反向。

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原文：
In the central heating or central air-conditioning cycle of water distribution systems, the widespread hydraulic imbalance, due to the differences between the various loops of the association between resistance and coupling, resulting in an uneven flow of the transmission and distribution, control difficulties, thus system operation caused by poor quality, flow control inaccurate unstable client Lengrebujun, forced to resort to large flow operation, a serious waste of energy and many other issues. The main reason is the use of poor quality are not reliable, easy to use, inexpensive traffic-control devices. Constant flow regulating valve is designed to overcome the above problems developed specialized control equipment, it can carry out accurate and reliable flow control and transmission and distribution, the eradication of water imbalance. Central heating or central air-conditioning circulating water pipe network system, the constant flow regulating valve installed in the loop on each client, according to the rated flow of each user to set aperture, you can achieve the balance of the entire transmission and distribution pipeline network system to ensure that transmission and distribution system flow balance and stability, and increase operational quality, energy-saving operation. No special debugging techniques and instruments to regulate the setting simple and intuitive, fast and reliable. In the central heating in a water or central air-conditioning building automation system, equipped with the valve actuator constant flow control valve can guarantee the system stability and ease traffic regulation and control, accurate and reliable, and increase operational quality, reduce the valve actuator action frequency and extend their useful life. According to the data shows that, in the central heating system, a rational and balanced flow of the transmission and distribution to achieve water balance, you can power-saving, economizer of 15-20% or more, equivalent per heating season per square meter construction area to reduce operating costs by 0.5 yuan; Since the settlement of the heating pipe network flow imbalance in the transmission and distribution, so that the end users for long periods of hot temperature compliance, will reduce customer complaints, but also can improve the rates, but also can give full play to the capacity of the existing boiler pump to expand the size of heating system, economic and social benefits are very impressive. Constant Flow Control Valve Constant flow regulating valve is a constant flow regulating valve function, it is the self-style differential pressure control device and flow control device combination valve, its working principle is: The differential pressure control device to control and stabilize the flow regulator pressure difference before and after installation, so that the valve is greater than constant pressure before and after the start value, the flow through the valve is no longer with the pressure difference before and after the change in pressure within the control of, through the valve of a an opening of the flow can automatically maintain a constant flow regulating valve opening only change can be realized, and the valve before and after the pressure has nothing to do. Some of the same working principle of the valve is called "dynamic balance valve," and some referred to as "self-operated flow controller" or "self-operated flow control (control) valve," they all have a certain constant flow of features, but in adjustment range, structure size, maintainability, materials and price and so varied. Beijing Tian Arrow Star Mechanical & Electrical Technology Co., Ltd. R & D constant flow regulating valve, in 2000 by Chinese utility model patent (patent number: 99,217,435), in 2001 through the International Patent Cooperation (PCT) of international search and international preliminary examination has been allowed to apply for Germany, the United States patents and patents in China, is the approval process. Constant flow control valve has the following characteristics: 1. The traditional shape, similar to the ordinary control valve. 2. Adjustment range is wide, generally 1:10 up to 1:20, fully adjustable to meet the needs of the user. 3. Differential pressure control range, the loss of pressure head up to 45 meters, a minimum of 2 ~ 3 meters. 4. To take pressure way outer join can become a "maximum flow with a constant differential pressure control valve functions," 5. Coaxial installation of internal parts can be equipped with different brands of travel angle valve actuators. 6. Sleeve-type seat valve flap, as an international first. 7. The use of metal bellows as a pressure-sensitive components, high reliability and long service life. 8. Removable upper structure, easy to maintain clean-up. Select the valve nominal diameter, the first valve of the evidence under the construction area, the user's heat index, the supply and return water pipe network to provide data such as temperature is calculated to determine the set flow; then listed in Table 1 Flow control selection of the valve DN, pay attention to the valve settings in the selection of the best traffic flow within in order to ensure an adequate margin of adjustment. As the constant flow control valve wide adjustable range, according to the general design of the valve bore diameter selection, if necessary necking. Install Location In the central heating system, installed a water heat exchanger in each export or import (Figure 1 a), the implementation of manual adjustment; also be installed valve actuators, temperature sensors, climate-controlled compensator and other instruments to implement automatic control ; In the outdoor central heating system, installed in various buildings back to the entrance of heat pipe or water pipe; In the central air-conditioning fan coil system, installed in the floor of the branch offices and individual air-conditioning unit coil at the entrance to return to water pipes or water supply pipe; also be installed with the automatic control valve actuator to effect automatic control instruments. In the splitting is not installed thermostatic valve control system can be installed in the entrance of return to household water pipes; in installing thermostatic valve control system in the household must be taken outside the pressure connection means (which require special ordering), installed in the the entrance of each building heating or water pipes in all units sharing the water supply riser pipe; attention to the external pressure measuring tube connected water pipes connected to the back; separate loop for each upload one, do not have to repeat the series to use. Adjusting method Wrench in hand with the first round of the following press release the blue, in search and settings on the dial corresponding to the traffic flow scale values, set the valve to this scale, and then screw can be pressed blue. In automatic control systems, constant flow control valve can be installed valve angle stroke actuator to automatically adjust flow rate. In the household heat metering system, the user can independently adjust opening to change the set flow temperature can meet different requirements, but also realize the behavior of energy-saving, reducing heat costs. Specifications Working pressure: 0.02 MPa - 0.45MPa; Operating temperature: 4 ℃ -130 ℃; Working pressure: 1.6 MPa; Relative error: 8%; Common Faults and exclusion method: Unknown cause of the malfunction and the exclusion of specific operation method: vibration, product gas, exhaust, the valve axial compression screw loose blue, the effluent can be tightened after. Inadequate or sewage flow will be repeated around gently rotate handwheel until rotating ring above, subject to jamming up; can also be removed under the lid or wire blocking the sewage. Traffic out of control, clogging dirt, clean: The roof bolts removed, the hand wheel and cover with up to bring out to clean up after the equipment back and pay attention to a trademark on the dial towards the valve imports, do not install the wrong. Notes Pay attention to maintaining water quality; attention to the arrow on the valve direction of flow in the same direction, not the reverse.