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結構特點 Structural Characteristic

水力控制閥就是用水壓控制的閥門，它由一個主閥(如圖所示)及其附設的導管、導閥、針閥、球閥和壓力表等組成。根據使用目的、功能及場所的不同可變成遙控浮球閥、減壓閥、緩閉止回閥、流量控制閥、泄壓閥、水力電動控制閥等。水力控制閥分隔膜型和活塞型兩類，工作原理相同，都是以上下游壓 P為動力，由導閥控制，使隔膜(活塞)液壓式差動操作，完全由水力自調節，從而使主閥閥盤完全開啟或完全關閉或處于調節狀態。當進入隔膜(活塞控制室內的壓力水被排到大氣或下游低壓區時，作用在閥盤底部和隔膜下方的壓力值就大于上方的壓力值，所以將主閥閥盤推倒到完全開啟的位置;當進入隔膜(活塞)上方控制室內的壓力水不能排到大氣或下游低壓區時，作用在隔膜(活塞)上方的壓力值就大于上方的壓力值，所以就會把主閥閥盤壓到完全關閉的位置;當隔膜(活塞)上方控制室內的壓力值處于入口壓力與出口壓力中間時，主閥閥盤就處于調節狀態，其調節位置取決于導管系統中的針閥和可調導閥的聯合控制作用。可調導閥可以通過下游的出口壓力并隨它的變化而開大或關小其自身的小閥口，從而改變隔膜(活塞)上方控制室的壓力值，控制主閥閥盤的調節位置。

s a kind of valve controlld by hydraulic pressure. which consists of a main vaive (as shown in the igure) plus the aditional guide tube, pilot vave, needle valve, ball valve, pressure gauge, ete. According to diferences in application purpose, unction and places,its derivatives include remote control floating ball valve, pressure reducing valve, slow-shut check valve, flow control valve, relief valve, hydraulic electric control valve, etc. he hydraulic control valve is divided into two kinds: diaphragm and piston, Both follow the same working principle, which are powered by the difference between the upstream pressure and the downstream pressure aP and controlled by the pilot valve, making the hydraulic diferential operation of the diaphragm (piston) and the fully automaatic hydraulic regulation so that the main valve disc is fully open, fully closed or in a state of regulation. When the hydraulic water going into the contral cabinet over the diaphragm (piston) is discharged into the atmosphere of the lower pressure area downstream the value of pressure onthe die a water downside below the diaphragm wil be larger than that on the top so theat the main valve clsc is pushed to the pstina presste going into the control cabinet over the diaphragm (piston) is not discharged into the atmosphere or the lower pressure area downstream, the value of pressure on the below the diaphragm will be larger than that on the top so that the main valve disc is pushed to the position of ful closing; when the value of pressure in the control cabinet over the diaphragm (piston) is between and adjustable pilot valve in the conduit system. The adjustable pilot valve can adjust its valve let opening along the change of the downstream outlet pressure so as to change the value of pressure in the control cabinet over the diaphragm (piston) to contro the regulating position of the main valve disc.