定压溢流作用:在定量泵节流调节系统中，定量泵提供的是恒定流量。当系统压力增大时，会使流量需求减小。此时溢流阀开启，使多余流量溢回油箱，保证溢流阀进口压力，即泵出口压力恒定(阀口常随压力波动开启)。
稳压作用:溢流阀串联在回油路上，溢流阀产生背压，运动部件平稳性增加。
系统卸荷作用:在溢流阀的遥控口串接溢小流量的电磁阀，当电磁铁通电时，溢流阀的遥控口通油箱，此时液压泵卸荷。溢流阀此时作为卸荷阀使用。
安全保护作用:系统正常工作时，阀门关闭。只有负载**过规定的极限(系统压力**过调定压力)时开启溢流，进行过载保护，使系统压力不再增加(通常使溢流阀的调定压力比系统较高工作压力高10%~20%)。
实际应用中一般有:作卸荷阀用，作远程调压阀，作高低压多级控制阀，作顺序阀，用于产生背压(串在回油路上)。
溢流阀一般有两种结构:1、直动型溢流阀 。2、先导式溢流阀。
对溢流阀的主要要求:调压范围大，调压偏差小，压力振摆小，动作灵敏，过载能力大，噪声小。
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SUN Counter balance valve A906-039
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SUN 泄压阀的维修包 9212 029 T01 OG
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SUN RDFA-LAN 溢流阀 200L/MIN
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SUN T-17A(含钻头绞刀各一支)
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SUN NFFC-LGV
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SUN VALVE CXJA-XDN
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SUN NFFC-LCN
SUN LG005 气动马达
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SUN 抗衡阀CBCA-LHV
SUN N4L9126
