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常用的减压阀有膜片活塞式和波纹管式两种。
选用：根据工艺确定的减压阀的流量，阀前、后压力及阀前流体温度等条件确定阀孔面积，选择减压阀的尺寸及规格。 可按照压力范围选用：
膜片活塞式减压阀的减压范围有：0.1~0.3MPa，0.2~0.8MPa，0.7~1.0MPa三种，超过此范围应该采用二级减压。
波纹管式减压阀前后压差不大于0.6MPa，且不小于0.05MPa，压差超过0.6MPa应采用二级减压。用于蒸汽时，波纹管应朝下安装;用于空气时，波纹管应朝上安装。
 
减压阀调压阀安装和使用
1、 安装减压阀之前必须对管路系统进行冲洗清理，以防焊渣、氧化皮等赃物流入阀内，影响阀门正常工作。
2、 减压阀应安装便于操作和维修的地方，并且必须直立安装在水平管路上，应注意使管路中介质的流向与阀体上箭头所示方向*，切勿装反。
3、 减压阀在安装使用时，应先把旁通管路上的截止阀打开，排除管路中的冷凝水和汽水混合物，以防减压阀开启时产生水击现象损坏减压阀，当无异常现象后，按顺时针方向缓慢旋转调节螺钉，将出口压力调至所需要的压力(以阀后表压为准)，调整好后，将锁紧螺母背紧，拧上防护罩。
4、 减压阀前应安装过滤器，以防止介质中的杂质进入减压阀，影响其性能。
5、 安装的减压阀前后应有一段直管，阀前直管长度约为600毫米，阀后直管长度约为1000毫米。
6、 减压阀进口还要装汽水分离器和疏水阀，减压阀出口也要装疏水阀。

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