自力式调节阀如何调压力
工作介质的阀前压力P1经过阀芯、阀座后的节流后,变为阀后压力P2。P2经过控制管线输入到执行器的下膜室内作用在顶盘上,产生的作用力与弹簧的反作用力相平衡,决定了阀芯、阀座的相对位置,控制阀后压力。当阀后压力P2增加时,P2作用在顶盘上的作用力也随之增加。此时,顶盘的作用力大于弹簧的反作用力,使阀芯关向阀座的位置,直到顶盘的作用力与弹簧的反作用力相平衡为止。这时,阀芯与阀座的流通面积减少,流阻变大,从而使P2降为设定值。同理,当阀后压力P2降低时,作用方向与上述相反,这就是自力式(阀后)压力调节阀的工作原理。
自力式调节阀工作原理(阀前压力控制)
工作介质的阀前压力P1经过阀芯、阀座后的节流后,变为阀后压力P2。同时P1经过控制管线输入到执行器的上膜室内作用在顶盘上,产生的作用力与弹簧的反作用力相平衡,决定了阀芯、阀座的相对位置,控制阀前压力。当阀后压力P1增加时,P1作用在顶盘上的作用力也随之增加。此时,顶盘的作用力大于弹簧的反作用力,使阀芯向离开阀座的方向移动,直到顶盘的作用力与弹簧的反作用力相平衡为止。这时,阀芯与阀座的流通面积减大,流阻变小,从而使P1降为设定值。同理,当阀后压力P1降低时,作用方向与上述相反,这就是自力式调节阀的工作原理。
自力式调节阀的结构优点
什么是自力式调节阀? 自力式调节阀是新型的调节阀产品,对于其他驱动形式的调节阀,如手动调节阀、气动调节阀、电动调节阀,优点在于能自动调节阀,节能能源。总结起来,主要有以下 3 点:
1 、不需要用电和气等辅助能源,依靠管道内被控介质的自身压力进行控制,结构简单、安装方便、投资小运行成本低,特别适合在钢管密布或潮湿的环境中应用,而采用其他方式一般都需要用电或压缩空气作动力,系统结构相对复杂,给安装和使用带来很大不便,而且投入大、可靠性差。
2 、阀门主体结构中,信号和推动的部件与主阀相互密封隔开,不会象其他控制方式那样因阀内部零件移损而出现滴、冒、漏现象。
3 、把各控制要素如信号采测、放大、反馈、控制、执行集为一体,并在运行时巧妙地运用流体力学和气动原理,整个控制过程在一个阀体内全部完成,尽管结构不复杂,但十分可靠。
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