在冷藏库设计中,一般都有2～3个蒸发温度(系统),每个蒸发温度都有各自的压缩机。但为了某一蒸发温度的压缩机发生故障或负荷过大时,另一蒸发温度的压缩机能调入运行,因此在两个蒸发温度之间设有旁通阀。目前,旁通阀的布置有三种做法。为了便于说明,下面以-33℃和-28℃两个蒸发温度,氨泵供液系统为例。 In the refrigerator design, there are generally 2 to 3 evaporation temperature (system), each evaporation temperature has its own compressor. However, for a certain evaporator temperature compressor failure or load is too large, the other evaporation temperature of the compressor can be transferred into operation, so there is a bypass valve between the two evaporation temperature. At present, there are three ways to arrange by-pass valves. For ease of explanation, the following two -33 ° C and -28 ° C evaporation temperature, ammonia pump supply system as an example.