*Rexroth力士樂溢流閥

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，穩(wěn)壓，系統(tǒng)卸荷和安全保護(hù)作用。
溢流閥的作用

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)開啟）。
穩(wěn)壓作用溢流閥串聯(lián)在回油路上，溢流閥產(chǎn)生背壓，運(yùn)動(dòng)部件平穩(wěn)性增加。
系統(tǒng)卸荷作用在溢流閥的遙控口串接溢小流量的電磁閥，當(dāng)電磁鐵通電時(shí)，溢流閥的遙控口通油箱，此時(shí)液壓泵卸荷。溢流閥此時(shí)作為卸荷閥使用。
安全保護(hù)作用系統(tǒng)正常工作時(shí)，閥門關(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)式溢流閥。
對(duì)溢流閥的主要要求調(diào)壓范圍大，調(diào)壓偏差小，壓力振擺小，動(dòng)作靈敏，過(guò)載能力大，噪聲小。

*Rexroth力士樂溢流閥

德國(guó)力士樂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 ,
DBDS 30 P1X/200V,
DBDS 30 K1X/315V,
DBDS 30 K1X/315,
DBDS 30 K1X/25,
DBDS 25 G1X/315,
DBDA 20 P1X/25,
DBDA 20 G1X/25,
DBDA 20 K1X/100,
DBDA 20 K1X/25V,
DBDH 20 K1X/50,
DBDA 15 G1X/25,
DBDA 10 P1X/ ,
DBDA 10 G1X/630V,
DBDA 10 G1X/25V,
DBDA 10 K1X/400,
DBDH 10 P1X/50V,
DBDH 10 G1X/315V,
DBDS 10 P1X/25V,
DBDS 10 K1X/315V,
DBDA 6 P1X/25,
DBDA 6 G1X/315V,
DBDS 6 P1X/200V,
DBDS 6 G1X/315,
DBDH 25 G1X/50,
DBDS 20 P1X/315,
DBDS 20 P1X/100,
DBDS 20 G1X/400V,
DBDS 20 G1X/315V,
DBDS 20 K1X/25,
DBDH 15 G1X/100V,
DBDH 10 P1X/315,
DBDH 6 P1X/50V,
DBDH 6 K1X/400,
DBDH 6 K1X/315,
DBDS 6 P1X/100,
DBDS 20 G1X/100V,
DBDH 10 K1X/50,
DBDS 6 P1X/50V,
DBDS 6 K1X/200,
DBDS 10 P1X/50,
DBDS 10 G1X/315V,
DBDA 6 G1X/400V,
DBDH 6 G1X/315V,
DBDS 6 P1X/315V,
DBDS 6 P1X/200,
DBDS 30 G1X/200V,
DBDS 30 G1X/100,
DBDH 25 G1X/100V,
DBDS 25 G1X/315V,
DBDS 25 G1X/315V,
DBDA 20 G1X/50V,
DBDA 20 K1X/50V,
DBDS 20 G1X/400,
DBDS 20 K1X/50,
DBDS 15 G1X/400,
DBDA 10 P1X/25V,
DBDH 10 P1X/50,
DBDH 10 G1X/400,
DBDS 10 P1X/630V,
DBDS 10 G1X/25V,
DBDS 10 K1X/25,
DBDA 8 G1X/25V,
DBDH 8 G1X/400,
DBDH 6 P1X/100V,
DBDS 6 P1X/50,
DBDS 6 K1X/50,
DBDH 30 G1X/25,
DBDH 30 K1X/25,
DBDS 30 G1X/50,
DBDS 30 K1X/200,
DBDA 20 P1X/100,
DBDH 20 P1X/25 ,
DBDS 20 P1X/315,
DBDS 20 P1X/50,
DBDS 20 K1X/50V,
DBDH 1 ,
DBDH 10 G1X/100&nb,
DBDH 10 K1X/200&nb ,
DBDS 10 G1X/630V&n ,
DBDS 10 K1X/315&nb ,
DBDA 6 K1X/100V&nb,
DBDH 6 G1X/400V&nb ,
DBDS 6 G1X/25  ,
DBDH 10 P1X/200V,
DBDH 10 K1X/630V,
DBDS 10 G1X/25,
DBDS 6 G1X/400V,
DBDS 6 G1X/400V,
DBDS 6 K1X/400V,
DBDS 6 K1X/50V,
DBDS 6 K1X/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 ;
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