原文：
（1）结构原理 1）DBD型直动式溢流阀 图1是DBD型直动式溢流阀的结构原理图。进油口的压力油通过阻尼活塞作用在其底部，形成了一个与弹簧力相抗衡的液压力。当此液压力小于调压弹簧的弹簧力时，锥阀关闭，此阀不起调压作用。随着进油口压力的不断提高。当液压力大于弹簧力时，锥阀开启，多余的油液溢回油箱，使进油口压力稳定在调定值上。 图1 DBD型直动式溢流阀结构原理图 a）至40MPa阀的结构；b）至63MPa阀的结构 1—调节螺杆；2—阀体；3—调压弹簧；4—偏流盘；5—锥阀；6—阻尼活塞 阻尼活塞的作用：一是在锥阀开启或闭合时起阻尼作用，用来提高阀的调压稳定性；二是对锥阀起导向作用，以提高阀的密封性能。 偏流盘的作用：偏流盘上开有环形槽，用以改变锥阀出油口的液流方向。于是偏流盘受到了一个液动力，此液动力与弹簧力的作用方向相反，并随溢流量的增加而加大。当溢流 量增加时，由于锥阀开口增大，引起弹簧力增加。但由于液动力也同时增加，结构抵消了弹簧力的增量。因此这种阀的进口压力不受流量变化的影响，其p-Q特性曲线比较理想，启闭特性好，有利于提高阀的额定流量。 （2）应用 1）起安全阀作用（防止液压系统过载）溢流阀起安全阀作用时，是为了限制液压系统的{zg}压力，以保证系统的安全。在系统正常工作情况下，阀关闭不溢流，系统的工作压力决定于外载荷。当系统压力达到阀的调定压力时，阀开启溢流，此时系统压力就决定于溢流阀的调定压力。 2）起溢流阀作用（维持液压系统压力恒定）在节流调速系统中，溢流阀在正常工作时为常开，通过溢流将多余油液排回油箱而维持液压系统压力基本恒定。 3）使液压系统卸荷 先导式溢流阀的远程控制口通油箱，就可以利用溢流阀使系统卸荷。DBW型先导式电磁溢流阀利用本身的电磁换向阀就可实现系统卸荷，而其他的先导式溢流阀要实现系统卸荷，就要在远程控制口上添加换向阀。 4）远程调压 在先导式溢流阀的远程控制口上接远程调压阀，能实现远程调压。 此外，溢流阀还可做背压阀使用，能使系统工作平稳；溢流阀与换向阀配合，可实现系统的多级压力控制；在制动回路中，用溢流阀可实现制动作用；在液压试验台系统中，溢流阀可用作加载阀等。

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译文：
(1) structural principle 1) DBD-type direct-acting Relief Valve Figure 1 is a direct-action relief valve type DBD structure diagram. Inlet pressure of the role of oil through the damping piston in its bottom, forming a spring force of fluid pressure to compete. When the fluid pressure regulator spring than the spring force, the cone valve is closed, the valve can not afford the role of regulator. With the inlet pressure rising. When fluid pressure is greater than the spring force, the cone valve is opened, the excess oil overflow tank back to the inlet pressure on the stability of the adjusted value. Figure 1 DBD-type direct-action relief valve structure diagram a) to 40MPa valve structure; b) to the valve structure 63MPa 1 - adjustment screw; 2 - body; 3 - Adjusting Spring; 4 - drift plate; 5 - cone valve; 6 - piston damping piston damping effect: First, when the cone valve to open or close from the damping effect, with to improve the stability of the pressure regulator valve; the second is from the guide cone valve to improve the valve's sealing performance. The role of drift plate: bias disc has opened a ring groove, cone valve to change flow direction of the oil port. So bias plate by a fluid power, fluid power and this spring force in the reverse direction, and increases with the increasing traffic overflow. When the overflow Volume increases, the cone valve opening increases, causing increased spring force. However, fluid power also increases, the incremental spring force offset. So the flow valve inlet pressure from the impact of changes, the pQ ideal curve, opening and closing characteristics of good, helping improve the valve's rated flow. (2) Application 1) The safety valve function (to prevent the hydraulic system overload) relief valve safety valve role, is to limit the maximum hydraulic system pressure to ensure the security of the system. Under normal operating conditions in the system, not close the overflow valve, the system's working pressure determined by the load. When the system pressure reaches the set pressure adjustment valve, the valve to open the overflow, this time determined by the system pressure relief valve set pressure adjustment. 2) from the relief valve function (to maintain constant pressure hydraulic system) in Throttle system, relief valve during normal working hours as normally open, through the overflow of excess oil returned to the tank while maintaining the basic constant pressure hydraulic system . 3) The unloading of the hydraulic system of the remote control pilot relief valve port through the tank, you can use the system unloading relief valve. DBW-type electromagnetic relief valve pilot solenoid valve can be used to achieve their own system of unloading, while the other pilot-unloading relief valve to achieve the system, we must add the remote control port valve. 4) Remote Pressure Relief Valve in the pilot population on the remote control access remote valve, pressure regulator can be remote. In addition, the relief valve back pressure valve can be used to do, make the system work smoothly; with relief valve and valve can achieve multi-level pressure control system; in the brake circuit, the system can be realized with relief valve action with; in the hydraulic test bench, the relief valve can be used as load valve.