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过滤调压阀是按力平衡原理设计工作的，其工作原理是按力平衡原理设计和工作的。高压介质通过一个小孔充到一个相对较大的腔里实现减压，实际上是靠截流减压，膜片或活塞的两面一面是出口腔，一面是人为给的压力，并且控制小孔大小的阀杆和膜片(活塞)相连，这样只要给一个固定的压力，那么出口腔的压力就会一直等于这个压力，这个认为给定的压力可以有弹簧或气源或液压源来提供。
具体来说，当通入波纹管的信号压力增加时，使杠杆绕支点转动，档板靠近喷嘴，喷嘴背压经放大器放大后，送入薄膜执行机构气室，使阀杆向下移动，并带动反馈杆(摆杆)绕支点转动，连接在同一轴上的反馈凸轮(偏心凸轮)也跟着作逆时针方向转动，通过滚轮使杠杆绕支点转动，并将反馈弹簧拉伸、弹簧对杠杆的拉力与信号压力作用在波纹管上的力达到力矩平衡时仪表达到平衡状态。此时，一定的信号压力就与一定的阀门位置相对应。

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