压力控制阀这类阀的功用是控制液压系统中液体的压力,通过它进而控制机器工作机构的作用力和动作的顺序,防止机器超载,油泵的卸荷等等。在这类中将介绍溢流阀、减压阀、顺序阀、卸荷阀、平衡阀、背压阀、以及压力继电器等。溢流阀溢流阀的作用是限制系统中液体的工作压力不超过某一调整值,防止系统过载。当系统中压力超过调整值时,溢流阀打开,系统中多余的液体流回油箱,使压力保持恒定。溢流阀在系统中是要求经常启闭的,这与防止系统超载损坏偶而动作的安全阀不同,所以要求启闭时平稳,振动小和噪音低。 Pressure control valve The function of these valves is to control the pressure of the liquid in the hydraulic system, and then through it to control the working mechanism of the machine and the order of the action, to prevent the machine overload, pump unloading and so on. In this category, we will introduce relief valves, pressure reducing valves, sequence valves, unloading valves, counterbalance valves, back pressure valves, pressure relays, etc. Relief valve relief valve role is to limit the liquid pressure in the system does not exceed a certain adjustment value to prevent system overload. When the pressure in the system exceeds the regulation value, the relief valve opens and excess liquid in the system flows back to the tank, keeping the pressure constant. Relief valve in the system is often required to open and close, which is to prevent the system overload and accidental damage caused by the safety valve is different, so require smooth opening and closing, vibration and low noise.