易福门压力开关是一种简单的压力控制装置，当被测压力达到额定值时，压力开关可发出警报或控制信号。它的工作原理是：当被测压力超过额定值时，弹性元件的自由端产生位移，直接或经过比较后推动开关元件，改变开关元件的通断状态，达到控制被测压力的目的。
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