在液压传动系统中,为了控制、调节油流的压力的高低、流量的多少和流动方向,必须有控制元件(也叫操纵和分配元件),通称阀类。所有的阀都由阀体、阀芯和阀的动力源三部分组成。下面分别将各种阀作简要介绍。一、压力控制阀压力控制阀有溢流阀、减压阀、顺序阀和压力继电器等,它们的共同特点是利用液体压力和弹簧作用力相平衡的原理控制系统压力的。 In the hydraulic transmission system, in order to control the pressure of the oil flow level, the amount of flow and flow direction, there must be control elements (also known as steering and distribution components), commonly known as valves. All the valves are made up of three parts of valve body, valve core and valve power source. The following will be a brief introduction of various valves. First, the pressure control valve pressure control valve relief valve, valve, sequence valve and pressure relay, etc. Their common feature is the use of liquid pressure and spring force balance principle to control system pressure.