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平衡阀是一种特殊功能的阀门，阀门本身物特殊之处，只在于使用功能和场所有区别。在某些行业中，由于介质（各类可流动的物质）在管道或容器的各个部分存在较大的压力差或流量差，为减小或平衡该差值，在相应的管道或容器之间安设阀门，用以调节两侧压力的相对平衡，或通过分流的方法达到流量的平衡，该阀门就叫平衡阀。平衡阀是一种特殊功能的阀门，它具有良好的流量特性，有阀门开启度指示，开度锁定装置及用于流量测定的测压小阀。利用专用智能仪表，输入阀门型号和开度值，根据测得的压差信号就可直接显示出流经该平衡阀的流量值，只要在各支路及用户入口装上适当规格的平衡阀，并用专用智能仪表进行一次性调试，就可使各用户的流量达到设定值。
平衡阀是在水力工况下，起到动态、静态平衡调节的阀门。如：静态平衡阀，动态平衡阀。
静态平衡阀亦称平衡阀、手动平衡阀、数字锁定平衡阀、双位调节阀等，它是通过改变阀芯与阀座的间隙（开度），来改变流经阀门的流动阻力以达到调节流量的目的，其作用对象是系统的阻力，能够将新的水量按照设计计算的比例平衡分配，各支路同时按比例增减，仍然满足当前气候需要下的部份负荷的流量需求，起到热平衡的作用。
动态平衡阀分为动态流量平衡阀，动态压差平衡阀，自力式自身压差控制阀等。
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