溢流閥是一種液壓壓力控制閥。

在液壓設(shè)備中主要起定壓溢流作用和安全保護(hù)作用。

定壓溢流作用：在定量泵節(jié)流調(diào)節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當(dāng)系統(tǒng)壓力增大時(shí)，會(huì)使流量需求減小。此時(shí)溢流閥開(kāi)啟，使多余流量溢回油箱，保證溢流閥進(jìn)口壓力，即泵出口壓力恒定(閥口常隨壓力波動(dòng)開(kāi)啟)。 

安全保護(hù)作用：系統(tǒng)正常工作時(shí)，閥門(mén)關(guān)閉。只有負(fù)載超過(guò)規(guī)定的極限(系統(tǒng)壓力超過(guò)調(diào)定壓力)時(shí)開(kāi)啟溢流，進(jìn)行過(guò)載保護(hù)，使系統(tǒng)壓力不再增加(通常使溢流閥的調(diào)定壓力比系統(tǒng)zui高工作壓力高10％～20％)。   實(shí)際應(yīng)用中一般有：作卸荷閥用，作遠(yuǎn)程調(diào)壓閥，作高低壓多級(jí)控制閥，作順序閥，用于產(chǎn)生背壓(串在回油路上)。 

溢流閥一般有兩種結(jié)構(gòu)：1、直動(dòng)型溢流閥 。2、先導(dǎo)型溢流閥

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REXROTH力士樂(lè)DBD系列溢流閥型號(hào)如下:
DBDS10K-1X/400
DBDS6K1/315
DBDS10K1X/400
DBDS10G-1X/200
DBDS20K1X/200
DBDS20K1X/50
DBDS10K1X/315
DBDS10K18/25
DBDS6K-1X/100
DBDS10P1X/400
DBDS6K1X/315
DBDS10K1X/315
DBDS10P1X/200
DBDS6K121X/100
DBDS10-P-1X/200
DBDS10K18/25
DBDS10-P-1X/200
DBDS10K18/25
DBDS20P10
DBDS10P1X/200
DBDS10G12/200
DBDS20K1X/50
DBDS6K1/315
DBDS6P1X/315
DBDS20P1X/315
DBDS10P1X/315
DBDS6P1X/315
DBDH10P-1X/200
DBDS10G-1X/200V
DBDS10G-1X/25
DBDS10K-1X/200
DBDS10K-1X/315
DBDS10K-1X/315
DBDS20G-1X/315V
DBDS20K-1X/200
DBDS20K-1X/315
DBDS20P-10/31.5
DBDS10-P1X/315
DBDS10K1X/400
DBDS10K1X/400
DBDS10G-1X/200
DBDH10G10/200
DBDS-20K-1X/315
DBDS10K1-1X/315
DBDS10K1-1X/100
DBDS6K-1X/100
DBDS6K-1X/100
DBDS10K1X/315
DBDS10K1X/315
DBDS6K-1X/100
DBDS6K-1X/100
DBDS20P1X/250
DBDS10K1X/315
DBDS10K18/25
DBDS6K1X/100
DBDS6K-1X/100
DBDS6G10/400
DBDS10P1X/200
DBDS6K121X/100
DBDS10G-1X/200
DBDS10-P-1X/200
DBDS10K18/25
DN10DBDS-10K10/315
DBDS6K1X/315
DBDS10P1X/200
DBDS6K121X/100
DBDS10-P-1X/200
DBDS10K18/25
DBDS6P1X/315
DBDS10-P-1X/200
DBDS10K18/25
DBDS10P1X/200
DBDS6K121X/100
DBDS10-P-1X/200
DBDS10K18/25
DBDS10-P-1X/200
DBDS10K18/25
DN10DBDS-10K10/315
DBDS6K1X/315
DBDH10P/400
DBDH6P1X/315
DBDS30G1X/315
DBDS10P1X/200
DBDS6G1X/315
DBDS10K1X/315
DBDS20K1X/315
DBDS20P1X/200
DBDS20P10
DBDS30P1X/200V
DBDS30K1X/315V
DBDS30K1X/315
DBDS30K1X/25
DBDS25G1X/315
DBDA20P1X/25
DBDA20G1X/25
DBDA20K1X/100
DBDA20K1X/25V
DBDH20K1X/50
DBDA15G1X/25
DBDA10P1X/
DBDA10G1X/630V
DBDA10G1X/25V
DBDA10K1X/400
DBDH10P1X/50V
DBDH10G1X/315V
DBDS10P1X/25V
DBDS10K1X/315V
DBDA6P1X/25
DBDA6G1X/315V
DBDS6P1X/200V
DBDS6G1X/315
DBDH25G1X/50
DBDS20P1X/315
DBDS20P1X/100
DBDS20G1X/400V
DBDS20G1X/315V
DBDS20K1X/25
DBDH15G1X/100V
DBDH10P1X/315
DBDH6P1X/50V
DBDH6K1X/400
DBDH6K1X/315
DBDS6P1X/100
DBDS20G1X/100V
DBDH10K1X/50
DBDS6P1X/50V
DBDS6K1X/200
DBDS10P1X/50
DBDS10G1X/315V
DBDA6G1X/400V
DBDH6G1X/315V
DBDS6P1X/315V
DBDS6P1X/200
DBDS30G1X/200V
DBDS30G1X/100
DBDH25G1X/100V
DBDS25G1X/315V
DBDS25G1X/315V
DBDA20G1X/50V
DBDA20K1X/50V
DBDS20G1X/400
DBDS20K1X/50
DBDS15G1X/400
DBDA10P1X/25V
DBDH10P1X/50
DBDH10G1X/400
DBDS10P1X/630V
DBDS10G1X/25V
DBDS10K1X/25
DBDA8G1X/25V
DBDH8G1X/400
DBDH6P1X/100V
DBDS6P1X/50
DBDS6K1X/50
DBDH30G1X/25
DBDH30K1X/25
DBDS30G1X/50
DBDS30K1X/200
DBDA20P1X/100
DBDH20P1X/25
DBDS20P1X/315
DBDS20P1X/50
DBDS20K1X/50V
DBDH10G1X/100&nb
DBDH10K1X/200&nb
DBDS10G1X/630V&n
DBDS10K1X/315&nb
DBDA6K1X/100V&nb
DBDH6G1X/400V&nb
DBDS6G1X/25
DBDH10P1X/200V
DBDH10K1X/630V
DBDS10G1X/25
DBDS6G1X/400V
DBDS6G1X/400V
DBDS6K1X/400V
DBDS6K1X/50V
DBDS6K1X/50V
DBDS20K-10/100
DBDS20K-10/25
DBDS6K121X/100
DBDS10-P-1X/200
DBDS10K18/25
DBDH6G1/315
DBDH6G18/400/12
DBD15G10/315
DBDS6K1X/200
DBDS20P1X/315
本公司專(zhuān)業(yè)代理銷(xiāo)售:德國(guó)力士樂(lè)REXROTH液壓產(chǎn)品,Rexroth比例伺服閥系列, A10VSO系列油泵.Rexroth齒輪泵,Rexroth比例放大器系列,A4VSG系列變量泵,Rexroth閥組系列,Rexroth比例減壓閥,Rexroth伺服閥。