它改变工艺流体的紊流度或者层流情况下提供一个压力降，压力降是由改变阀门阻力或“摩擦”所引起的。这一压力降低过程通常称为“节流”。对于气体，它接近于等温绝热状态，偏差取决于气体的非理想程度（焦耳一汤姆逊效应）。在液体的情况下，压力则为紊流或粘滞摩擦所消耗，这两种情况都把压力转化为热能，导致温度略为升高。WH系列电液换向阀HOYEA换向阀HOYEA电液换向阀华液换向阀华液FWH电液换向阀FWH-04-2B2-A220Z5L,FWH-04-2B3-A220Z5L,FWH-04-2B8-A220Z5L,FWH-06-3C2-A220Z5L,FWH-06-3***-A220Z5L,FWH-06-3C3-A220Z5L,FWH-04-3C3-D12Z5L,FWH-04-3***0-D12Z5L,FWH-04-3C60-D12Z5L,FWH-04-3C9-D12Z5L,FWH-04-3C10-D12Z5L,FWH-04-3C11-D12Z5L,FWH-04-3C12-D12Z5L,FWH-04-2D2-D12Z5L,FWH-04-2B2-D12Z5L,FWH-04-2B3-D12Z5LFWH-06-2B2-D12Z5L,FWH-06-2B3-D12Z5LFWH-06-3C60-A220Z5L,FWH-06-3C9-A220Z5LFWH-06-3C11-A220Z5L,FWH-03-3C2-A220Z5L,FWH-03-3***-A220Z5LFWH-04-3C2-A110Z5L,FWH-04-3***-A110Z5LFWH-04-3C2-D24Z5L,FWH-04-3***-D24Z5LFWH-06-3***-D24Z5LHOYEA电液换向阀部分型号如下：FWH-04-3C2-A220Z5L,FWH-04-3***-A220Z5L,FWH-04-3C3-A220Z5L,FWH-04-3***0-A220Z5L,FWH-04-3C60-A220Z5L,FWH-04-3C9-A220Z5LFWH-04-3C10-A220Z5L,FWH-04-3C11-A220Z5L,FWH-04-3C12-A220Z5L)