先导型溢流阀由主阀和先导阀两部分组成。先导阀类似于直动型溢流阀，
但一般多为锥阀（或球阀）形阀座式结构。主阀可分为一节同心结构、
二节同心结构和三节同心结构。
产品类型DBW溢流阀 直动式（系列 5X）,带装配好的,带装配好的换向滑阀
先导阀先导式阀（成套）DBDS10K18/315 DBDS10G1X/630 DBDH10P1X/50V
DBDS20P-1X/100 DBDS20P1X/25 DBDH20P1X/25  DBDS20P1X/315
DBDS20P1X/50   DBDS20K1X/50V DBDH10G1X/100 DBDH10K1X/200 
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