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原文
Hydraulic Control Valve Diaphragm-type hydraulic control valves and piston-type sub-categories, work the same all over the downstream pressure difference △ P as a driving force, controlled by the pilot valve, the diaphragm (piston) hydraulic differential operation is entirely automatic hydraulic adjustment, which the main valve fully open or fully closed plate or in regulation. When entering the diaphragm (piston) pressure to the control room above the water is discharged to the atmosphere or the downstream area of ??low pressure, the role of the diaphragm in the valve plate and the bottom of the pressure below the pressure value is greater than the above value, it will push the main valve disc to completely the open position; when entering diaphragm (piston) pressure of water above the control room can not be discharged to the atmosphere or the downstream area of ??low pressure, the role of the diaphragm (piston) is greater than the pressure above the bottom of the pressure, so will the main valve disc pressure to the fully closed position; when the diaphragm (piston) pressure above the control room in the middle of inlet pressure and outlet pressure, the main valve disc on in regulation, the regulation depends on the location of the catheter needle valve system adjustable valve guide and the role of joint control. Adjustable by the pilot valve downstream of the outlet pressure and it changes with the opening of its own large or small the small off valve port, thus changing the diaphragm (piston) pressure above the control room, control side valve disc position adjustment
原文来自：http://www.kongzhifa.org.cn

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译文：
水力控制阀分隔膜型和活塞型两类，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，完全由水力自动调节，从而使主阀阀盘完全开启或完全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完全开启的位置；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完全关闭的位置；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型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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