译文：
1、水力控制阀的概念：水力控制阀就是水压控制的阀门，它由一个主阀及其附设的导管﹑导阀﹑针阀﹑球阀和压力表等组成。 2、水力控制阀的种类：根据使用目的﹑功能及场所的不同可演变成遥控浮球阀﹑减压阀﹑缓闭止回阀﹑流量控制阀﹑泄压阀﹑水力电动控制阀、水泵控制阀等。 按结构可分为隔膜型和活塞型两类。 3、水力控制阀的隔膜型和活塞型两类阀门的工作原理相同，都是以上下游压力差△P为动力，由导阀控制，使隔膜（活塞）液压式差动操作，xx由水力自动调节，从而使主阀阀盘xx开启或xx关闭或处于调节状态。当进入隔膜（活塞）上方控制室内的压力水被排到大气或下游低压区时，作用在阀盘底部和隔膜下方的压力值就大于上方的压力值，所以将主阀阀盘推到xx开启的位置；当进入隔膜（活塞）上方控制室内的压力水不能排到大气或下游低压区时，作用在隔膜（活塞）上方的压力值就大于下方的压力值，所以就会把主阀阀盘压到xx关闭的位置；当隔膜（活塞）上方控制室内的压力值处于入口压力与出口压力中间时，主阀阀盘就处于调节状态，其调节位置取决于导管系统中的针阀和可调导阀的联合控制作用。可调导阀可以通过下游的出口压力并随它的变化而开大或关小其自身的小阀口，从而改变隔膜（活塞）上方控制室的压力值，控制方阀阀盘的调节位置。 　

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原文：
1 The concept of hydraulic control valves: hydraulic control valve is pressure-controlled valve, which consists of a main valve and pilot valve attached to the catheter ﹑ ﹑ ﹑ needle valve and pressure gauges and other components. 2, hydraulic control valve types: use of such purpose, according to the different functions and areas can be turned into a floating ball remote control valve ﹑ ﹑ ﹑ relief valve flow control valve closed pressure relief valve ﹑ ﹑ electric hydraulic control valve, pump control valve. According to the structure can be divided into two types of membrane-type and piston type. 3, diaphragm-type hydraulic control valve and piston valve works the same categories are lower than the pressure difference △ P as the driving force controlled by the pilot valve to diaphragm (piston) hydraulic differential operation, entirely by water automatic adjustment, so that the main valve plate fully opened or fully closed or in the adjustment state. When entering the diaphragm (piston) pressure of water above the control room were discharged to the atmosphere or downstream area of low pressure, the role of the bottom plate and the diaphragm valve below the pressure value is greater than the pressure above the value, it will push the main valve disc to complete open position; when entering diaphragm (piston) pressure control room above the water can not be discharged to the atmosphere or the downstream area of low pressure, the role of the diaphragm (piston) above the pressure value is greater than the pressure below the value, so will the main valve pressure to fully close the valve plate position; when the diaphragm (piston) pressure values above the control room in the middle of the inlet pressure and outlet pressure, the main valve disc on the state in regulating its location depends on the adjustment of the needle and catheter system Adjustable role of joint control valve. Adjustable valve outlet pressure through the downstream and changes with the opening of its large or small their own off the small valve port, thus changing the diaphragm (piston) pressure values above the control room, the controlling party, the regulation valve disc position.