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自力式流量控制阀在热网系统中的应用

在热水采暖系统中，由于设计、运行和管理等因素的影响，经常出现循环流量、系统差压、系统阻力及系统平衡等问题，而系统不平衡，即系统水力失调是供热效果差的首要问题。
调节水力失调的有效手段是在热用户入口处安装调节设备，一般有“自力式流量控制阀”、“自力式压差控制阀”。在热网的每个用户单体的热入口的回水管上安装一台“自力式流量控制阀”，当然视现场情况也可以安装在供水管线上，如因为供水压力过高、暖气片承压不够或回水管线位置紧张等。其作用是，使每个供热单体按照其供暖面积所需要的热量供给热水量。
为解决这一问题，我们选用了泊头同力环保设备公司的自力式流量控制阀作为供热系统的流量调节控制设备。
自力式流量控制阀是根据流量恒定原理，利用压差为动力，通过膜片和自动装置的联动自调作用，来达到控制和稳定流量的目的。从而根除了系统水力失调，使供热趋于合理，基本实现了“热尽其用，按需分配”。由于减少了近端热源户的流量和阻力，使远端用户有了压差，循环大为改善，降低了电耗、煤耗。
“自力式流量控制阀”的原理是孔板原理，结构是多孔板的组合。由手动和自动两部分组成，它依靠管道的自身压差为动力，手动部分设定的流量值，用自动部分随热网管道压力变化自动调整做保证，使手动部分设定的流量值恒定不变。
自力式流量控制阀，相对于手动调节阀、平衡阀，它的优点是具有动态调节功能；相对于电动调节阀，它的优点是不需要外部动力，只靠被控介质本身的压差作动力，因此节约能源，所以在供热、制冷系统中得到了广泛应用。
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