减温减压器就是将高温高压蒸汽降为能够使用的低压低温蒸汽（可以为过热蒸汽）。
减温减压器可分为一体式和分体式两种类型；一体式就是减温减压都在同一个减温减压阀内；分体式减温减压器就是将减温减压分开进行，减压采用单独减压阀，它控制精度高、运行平稳、调节灵敏，可有效清除静差影响。
概述减温减压装置广泛应用于电站、工业锅炉或热电厂等领域，是石化、造纸等行业中不可缺少的部分。顾名思义，减温减压器就是通过对高温高压蒸汽进行减温和减压，使蒸汽温度和压力达到工艺要求的装备。在工业生产热交换环节中，饱和蒸汽传热效率最高，因此需要对过热蒸汽降温以作热交换适用。为了保护设备或者提高热效率，工业生产中需利用减温减压器调节蒸汽的温度和压力。
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