原文：
1、动态平衡阀门的工作原理 通过改变平衡阀门的阀芯的过流面积来适应阀门前后的变化，从而达到控制流量的目的。动态平衡阀是一个局部阻力可以变化的节流元件，对于不可压缩的流体其简化流量的方程为： Q=KA（△P） 式中：Q——通过平衡阀门的流量； K——阀门开度的流量系数； A——阀芯的过流面积 △P——阀门进出口压差 由于在阀门的开度不变的前提下，K值的变化可忽略，因此阀门的流量要保持恒定应控制A（△P）不变。 而平衡阀门由可变过流面积的阀胆和高精度（±5％）的弹簧及支撑装置构成。弹簧受压差的作用自动控制阀胆上过流面积的大小，从而使通过阀门的流量恒定。 2、阀门的工作过程： 当平衡阀门前后压差小于最小启动压差是弹簧未被压缩，流通面积{zd0}。当阀门前后压差在工作范围时阀胆压缩弹簧，进入工作状态，水流通过阀胆两边的圆孔和几何型的通道流过；由于阀胆在运动，两边几何流型的通道也因此变化—阀体的流通面积不断变化，在这一压差范围内水流流量基本保持恒定。当平衡阀前后压差超越工作范围是，阀胆xx压缩弹簧，水流只从阀胆两边的圆孔流过，此时阀胆变成了固定的调节器，流量与压差成正比，随压差的增大而增大。 动态平衡阀门具有在一定的压力范围内限制空调末端设备的{zd0}流量、自动恒定流量的特点，在大工型、复杂、空调采暖负荷不恒定的工程中，简化了系统调试过成，并缩短了调试时间。特别是在异程水系统中使用平衡阀，可以容易实现水力工况平衡、满足设计环境温度的要求，并且在空调系统的运行中末端设备可以不受其他末端的启停干扰。

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译文：
1, dynamic balance valve works By changing the balance of the spool valve to accommodate the overflow valve area before and after the change, to achieve the purpose of flow control. Dynamic Balance valve is a local resistance to change spending components, the incompressible fluid flow equation is simplified as: Q = KA (△ P) The formula: Q - by balancing the flow valves; K - Flow coefficient of valve opening; A - flow area of spool over △ P - the pressure drop valve Since opening the valve without changing, K value of the change can be ignored, so the flow valve should be controlled to maintain a constant A (△ P) unchanged. The balance of the valve by the variable flow area through the valve guts and precision (± 5%) of the spring and the supporting device constituted. The role of spring pressure difference over flow control valve guts on the size of the area, so that the flow through the valve constant. 2, valve work process: When the balance of the valve before and after the pressure is less than the minimum start pressure is a compressed spring is not the largest circulation area. When the valve before and after the pressure in the range of work lamps valve compression spring, into operation, water flow through valve hole on both sides of bile and geometric-based channel flowing through; as valve bile in motion, geometric flows on both sides and therefore change the channel type - the ever-changing body of the circulation area, the water flow within the pressure remained constant. When balancing valve and pressure beyond the scope of work is fully compressed spring valve gallbladder, bile flow only from both sides of the valve hole flow, when valves guts into a fixed regulator, flow and pressure difference in proportion with the pressure difference increases. Dynamic Balance valve is the pressure in the context of certain restrictions on the maximum flow of air terminal equipment, automatic constant flow characteristics, in the large-type, complex, air conditioning heating load is not constant in the project, simplify system debugging, and shortened debugging time. Particularly in the use of different process water system balancing valves, hydraulic conditions can be easy to achieve balance, designed to meet the requirements of environmental temperature and air-conditioning systems running at the end of the end device can not start and stop other interference.