DB型阀主要用作溢流阀、安全阀、远程调试阀等。广泛应用于轻工、机床、冶金、矿山、航天等各领域中，是替代进口的优质元件。
DB/DBW型阀是先导控制的二节同心式溢流阀，导阀和主阀均为锥阀式结构。DB型阀主要用于控制系统的压力；DBW型阀也可以控制系统的压力并能在任意时刻使之卸荷。
——板式连接
——管式连接
——插装式连接
——有三种压力调节型式
带保护罩的内六角调节螺栓
调节手柄
带锁调节手柄
——由电磁换向阀电磁卸荷
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