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溢流阀易产生高频噪声，主要是先导阀性能不稳定所致，即为先导阀前腔压力高频振荡引起空气振动而产生的噪声。

其主要原因有：

(1)油液中混入空气，在先导阀前腔内形成气穴现象而引发高频噪声。此时，应及时排尽空气并防止外界空气重新进入。

(2)针阀在使用过程中因频繁开启而过度磨损，使针阀锥面与阀座不能密合，造成先导流量不稳定、产生压力波动而引发噪声，此时应及时修理或更换。

(3)先导阀因弹簧疲劳变形造成其调压功能不稳定，使得压力波动大而引发噪声，此时应更换弹簧。

(1)油液中混有空气或液压缸中空气未完全排尽，在高压作用下产生气穴现象而引发较大噪声。此时，须及时排尽空气。

(2)缸头油封过紧或活塞杆弯曲，在运动过程中也会因别劲而产生噪声。此时，须及时更换油封或校直活塞杆。

常规型号：
德国力士乐柱塞泵A10VSO 10排量：
A10VSO10DR/52R-PPA12N00
A10VSO10DR/52L-PKC64N00
A10VSO10DR/52L-PPA14N00
A10VSO10DR/52L-PUC64N00
A10VSO10DR/52L-PUC64N00 E
A10VSO10DR/52R-PKC14N00
A10VSO10DR/52R-PKC64N00
A10VSO10DR/52R-PKC64N00 E
A10VSO10DR/52R-PKC64N00 ESO857
A10VSO10DR/52R-PKC64N00 ESO858

A10VSO10DR/52R-PKC64N00 ESO938
A10VSO10DR/52R-PKC64N00-SO857
A10VSO10DR/52R-PKC64N00-SO858
A10VSO10DR/52R-PKC64N00-SO938
A10VSO10DR/52R-PPA14N00
A10VSO10DR/52R-PPA14N00 E
A10VSO10DR/52R-PPA14N00-SO846
A10VSO10DR/52R-PPA14N00-SO857
A10VSO10DR/52R-PPA14N00-SO858
A10VSO10DR/52R-PPA64N00
A10VSO10DR/52R-PSA14N00
A10VSO10DFR/52L-PKC64N00
A10VSO10DFR/52L-PKC64N00 E
A10VSO10DFR/52L-PUC64N00
A10VSO10DFR/52R-PKC14N00
A10VSO10DFR/52R-PKC64N00
A10VSO10DFR/52R-PKC64N00 E
A10VSO10DFR/52R-PKC64N00-S1645
A10VSO10DFR/52R-PPA14N00
A10VSO10DFR/52R-PPA14N00-SO858
A10VSO10DFR/52R-PSA14N00-SO858
A10VSO10DFR/52R-PSC64N00
A10VSO10DFR/52R-PUC64N00
A10VSO10DFR/52R-PUC64N00 E
A10VSO10DFR/52R-PUC64N00 E
A10VSO10DFR/52R-PUC64N00 ESO857
A10VSO10DFR/52R-PUC64N00-SO857
A10VSO10DFR/52R-VUC14N00
A10VSO10DFR/52R-VUC14N00-SO420
A10VSO10DFR1/52L-PKC64N00
A10VSO10DFR1/52L-PPA14N00
A10VSO10DFR1/52L-PSC14N00
A10VSO10DFR1/52L-PSC64N00
A10VSO10DFR1/52L-PUC64N00
A10VSO10DFR1/52R-PKC64N00
A10VSO10DFR1/52R-PKC64N00 E
A10VSO10DFR1/52R-PKC64N00 E
A10VSO10DFR1/52R-PKC64N00-SO857
A10VSO10DFR1/52R-PKC64N00-SO858
A10VSO10DFR1/52R-PPA14N00
A10VSO10DFR1/52R-PPA14N00-S1482
A10VSO10DFR1/52R-PPA14N00-SO857
A10VSO10DFR1/52R-PPA14N00-SO858
A10VSO10DFR1/52R-PSA14N00-S1915
A10VSO10DFR1/52R-PSA14N00-SO 32
A10VSO10DFR1/52R-PSC14N00
A10VSO10DFR1/52R-PSC14N00-SO 32
A10VSO10DFR1/52R-PSC64N00
A10VSO10DFR1/52R-PSC64N00 E
A10VSO10DFR1/52R-PSC64N00 ES1768
A10VSO10DFR1/52R-PSC64N00-S1768
A10VSO10DFR1/52R-PUC64N00
A10VSO10DFR1/52R-PUC64N00 E
A10VSO10DFR1/52R-PUC64N00 E
A10VSO10DFR1/52R-PUC64N00-SO857
A10VSO10DFR1/52R-VPA14N00
A10VSO10DFR1/52R-VUC64N00
A10VSO10DR/52R-PSA14N00-S1482
A10VSO10DR/52R-PSA14N00-SO 32
A10VSO10DR/52R-PSA14N00-SO857
A10VSO10DR/52R-PSC64N00
A10VSO10DR/52R-PSC64N00 E
A10VSO10DR/52R-PSC64N00-SO858
A10VSO10DR/52R-PSC64N00-SO922
A10VSO10DR/52R-PUC14N00
A10VSO10DR/52R-PUC14N00
A10VSO10DR/52R-PUC64N00
A10VSO10DR/52R-PUC64N00 E
A10VSO10DR/52R-PUC64N00-S1768
A10VSO10DR/52R-PUC64N00-SO857
A10VSO10DR/52R-PUC64N00-SO858
A10VSO10DR/52R-VKC64N00 ES1768
A10VSO10DR/52R-VKC64N00-S1768
A10VSO10DR/52R-VPA14N00
A10VSO10DR/52R-VPA14N00-SO857
A10VSO10DR/52R-VSC64N00-SO857
A10VSO10DRG/52L-PSC64N00
A10VSO10DRG/52L-PUC64N00
A10VSO10DRG/52R-PKC14N00
A10VSO10DRG/52R-PKC64N00
A10VSO10DRG/52R-PKC64N00 E
A10VSO10DRG/52R-PKC64N00-SO846
A10VSO10DRG/52R-PKC64N00-SO857
A10VSO10DRG/52R-PKC64N00-SO858
A10VSO10DRG/52R-PPA14N00
A10VSO10DRG/52R-PPA14N00-SO857
A10VSO10DRG/52R-PPA14N00-SO858
A10VSO10DRG/52R-PPC14N00
A10VSO10DRG/52R-PSC14N00
A10VSO10DRG/52R-PSC14N00-SO857
A10VSO10DRG/52R-PSC64N00
A10VSO10DRG/52R-PUC14N00
A10VSO10DRG/52R-PUC64N00
A10VSO10DRG/52R-PUC64N00-SO857 

A10VSO 18排量：
A10VSO18DR/31R-PPA12N00
A10VSO18DR/31R-PPA12K01
A10VSO18DFR1/31R-PPA12N00
A10VSO18DFR1/31R-PPA12N00
A10VSO18DFR1/31R-PPA12K01
A10VSO18DFR/31R-PPA12N00
A10VSO18DFLR/31R-PPA12N00
A10VSO18DG/31R-PPA12N00
A10VSO18DRG/31R-PPA12N00
A10VSO18DFE1/31R-PPA12N00
A10VSO18FHD/31R-PPA12N00
A10VSO18ED/31R-PPA12N00

德国力士乐柱塞泵A10VSO 28排量：
A10VSO28DR/31R-PPA12N00
A10VSO28DR/31R-PPA12K01
A10VSO28DFR1/31R-PPA12N00
A10VSO28DFR1/31R-PPA12N00
A10VSO28DFR1/31R-PPA12K01
A10VSO28DFR/31R-PPA12N00
A10VSO28DFLR/31R-PPA12N00
A10VSO28DG/31R-PPA12N00
A10VSO28DRG/31R-PPA12N00
A10VSO28DFE1/31R-PPA12N00
A10VSO28FHD/31R-PPA12N00
A10VSO28ED/31R-PPA12N00

德国力士乐柱塞泵A10VSO 45排量：
A10VSO45DR/31R-PPA12N00
A10VSO45DR/31R-PPA12K01
A10VSO45DFR1/31R-PPA12N00
A10VSO45DFR1/31R-PPA12N00
A10VSO45DFR1/31R-PPA12K02
A10VSO45DFR/31R-PPA12N00
A10VSO45DFR/31R-PPA12K01
A10VSO45DFR/31R-PPA12K26
A10VSO45DFLR/31R-PPA12N00
A10VSO45DG/31R-PPA12N00
A10VSO45DRG/31R-PPA12N00
A10VSO45DFE1/31R-PPA12N00
A10VSO45FHD/31R-PPA12N00
A10VSO45ED/31R-PPA12N00
德国力士乐柱塞泵A10VSO 71排量：
A10VSO71DR/31R-PPA12N00
A10VSO71DR/31R-PPA12K01
A10VSO71DFR1/31R-PPA12N00
A10VSO71DFR1/31R-PPA12N00
A10VSO71DFR1/31R-PPA12K02
A10VSO71DFR/31R-PPA12N00
A10VSO71DFR/31R-PPA12K27
A10VSO71DFLR/31R-PPA12N00
A10VSO71DG/31R-PPA12N00
A10VSO71DRG/31R-PPA12N00
A10VSO71DFE1/31R-PPA12N00
A10VSO71FHD/31R-PPA12N00
A10VSO71ED/31R-PPA12N00
德国力士乐柱塞泵A10VSO 100排量：
A10VSO100DR/31R-PPA12N00
A10VSO100DR/31R-PPA12K01
A10VSO100DFR1/31R-PPA12N00
A10VSO100DFR1/31R-PPA12N00
A10VSO100DFR1/31R-PPA12K01
A10VSO100DFR/31R-PPA12N00
A10VSO100DFLR/31R-PPA12N00
A10VSO100DG/31R-PPA12N00
A10VSO100DRG/31R-PPA12N00
A10VSO100DFE1/31R-PPA12N00
A10VSO100DFE1/31R-PPA12K02
A10VSO100FHD/31R-PPA12N00
德国力士乐柱塞泵A10VSO 140排量：
A10VSO140DR/31R-PPB12N00
A10VSO140DR/31R-PPB12K01
A10VSO140DFR1/31R-PPB12N00
A10VSO140DFR1/31R-PPB12N00
A10VSO140DFR1/31R-PPB12K01
A10VSO140DFR/31R-PPB12N00
A10VSO140DFLR/31R-PPB12N00
A10VSO140DG/31R-PPB12N00
A10VSO140DRG/31R-PPB12N00
A10VSO140DFE1/31R-PPB12N00
A10VSO140DFE1/31R-PPB12N002
A10VSO140FHD/31R-PPB12N00
A10VSO140ED/31R-PPB12N00
以上为德国力士乐A10VSO型号 (31和52系列)无通轴型柱塞泵10、18、28、45、71、100、140各排量常规型号。