上海东沟液压件厂生产的减压式先导阀,是一种新型的液压控制阀。例如用它来控制换向阀(如图所示)可达到比例控制流量的作用,也可以用于油泵变量等其它比例控制的场合。其原理是先导阀的阀芯在平衡弹簧力作用下处于动平衡状态。输出压力(二次压力)随手柄角度位置而变化,类似一个定压式减压阀的动作原理,因此称减压式先导阀。在理论上,二次压力与手柄角度成直线比例关系,因此又称之比例先导阀。目前该厂生产的先导阀二次输出压力有3～13公斤力/ Shanghai Donggou Hydraulic Factory production of decompression pilot valve, is a new type of hydraulic control valve. For example, it can be used to control the directional valve (as shown) to achieve proportional control of the flow of the role, but also can be used for other variables such as pump variable control of the occasion. The principle is the pilot valve spool under the action of the balance spring force in a state of dynamic balance. The output pressure (secondary pressure) changes with the angle of the handle, similar to the action principle of a constant pressure reducing valve, so it is called a decompression pilot valve. In theory, the secondary pressure and handle angle into a linear relationship, so also known as the proportion of pilot valve. At present, the factory production of pilot valve secondary output pressure of 3 ~ 13 kg force /