调压器(英语:Pressure regulator)是一种自动调节流体出口压力使其稳定在某一压力范围内的装置,通常是只依靠被控流体的能量自行操作并保持被控压力恒定的,因此也称为调压阀减压阀

在实际应用上,调压器通常被用在燃气管路上,是一种特殊阀门,能够将管道上游燃气压力降至一定压力并输出到下游的阀门。燃气调压器也是一种自力式压力调节阀,即无需外加动力源。

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