溢流阀是液压系统中最常见、最重要的元件，调定和维持系统压力恒定是溢流阀的主要作用。但在实际生产中，常不能及时购买到系统所需调压范围的溢流阀。为此，现介绍一种将现有溢流阀调压范围降低及简明计算的方法。　　(1)分析及计算溢流阀进油口的压力P是由溢流阀弹簧力决定 Pressure relief valve is the most common hydraulic system, the most important component, set and maintain a constant pressure system is the main role of relief valve. However, in actual production, it is often not possible to buy a relief valve in the required pressure-regulating range of the system in time. To this end, we now introduce a reduction of existing pressure relief valve relief valve and concise calculation method. (1) Analysis and calculation of relief valve inlet pressure P is determined by the relief valve spring force