DG4V-3-2B-M-U-H7-60
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四通阀换向的基本条件是活塞两端的压力差（f1-f2）必须大于摩擦阻力f，否则，四通阀将不会换向。换向所需的***低动作压力差（华鹭的实际水平低于1kg/cm2）是*系统流量来保证的（如上图所示）。
当左右活塞的压力差（f1-f2）大于摩擦阻力f时，四通阀换向开始，当主滑阀运动到中间位置时，四通阀的e、s、c三条接管相互导通，压缩机排出的冷媒从四通阀d接管直接经e、c接管流向s接管（压缩机回气口），使压力差快速降低，形成瞬时窜气状态（中间流量状态）。
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DG4V-5-2A-M-P7L-H-7-40
DG4V-5-2A-MU-A6-20
DG4V-5-2A-M-U-C6-20
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换向阀CGR-02-F-K-30
DG4M4-32C 20 M14 JA
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DG4S4-010A-U-B-60-S326
DG4S4-010A-U-H-60-LH
DG4S4-012A-B-60
DG4S4-012A-H-60
DG4S4-012A-U-B-60
DG4S4-012A-U-B-60-S324此时，若压缩机的排气流量远大于四通阀的中间流量，便可以建立足够大的换向压力差而使四通阀换向到位；反过来，若压缩机的排气量小于四通阀的中间流量，则四通阀换向所需的***低动作压力差便不能建立，即f1-f2。流量不足
1、空调系统发生***，造成系统冷媒循环量不足；
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DGMPC-5-ABK-BAK-30 2、天气很冷时，冷媒蒸发量不足；
3、四通阀与系统匹配不佳，即所选四通阀中间流量大而系统能力小；
4、空调换向时间。一般系统设计为压缩机停机一定时间后四通阀才换向，此时高低压趋于平衡，换向到中间位置便停止，即四通阀换向不到位，主滑阀停在中间位置，下次启动时，由于中间流量作用造成流量不足；
5、压缩机启动时流量不足，变频机更明显。R900574632 4WE6D6X/EG24K4QMBG24
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