The Hydraulic control valve is to pipeline media pressure as the driving force, for opening and closing, regulating the valve. It consists of a main valve and the attached conduit, needle valves, ball valves pressure gauges, etc., according to the purpose of the use of the function of the different places, can evolve into a remote-controlled float valves, pressure-reducing valves, slow-closing check valves, flow controllers, pressure relief valves, hydro-power control valves, emergency shut-off valves and so on.
1.Water control valve before starting, the pressure of the outlet end of the valve on the upper valve plate, the valve is in the closed position. At the same time, the upper chamber of the diaphragm controller is connected to the pressure water, the lower chamber is and the end of the valve is connected to the low pressure.
2.Multi-functional water control valve in the start, the valve pressure slowly rises, at the same time, the pressure water is through the valve end of the connecting pipe slowly into the diaphragm controller of the lower chamber, the realization of the upper valve plate slowly open, open speed can be adjusted according to the control valve.
3.Water control valve in the shutdown, the valve pressure is reduced, and when close to zero flow, the upper valve plate in its own gravity is immediately closed.
As the pressure of the valve is lowered, the pressure of the valve outlet end of the water is through the connection pipe into the upper chamber of the diaphragm controller,and the lower chamber of the water is through the valve end of the connection pipe pressure back to the end of the valve, the slow closing valve plate will slowly close, slow shutdown can be adjusted according to the control valve. The upper valve plate of the rapid closure and slow closure valve plate of the slow closure is in line with the two-stage closure of the law and can be the groundwater hammer.
The Hydraulic control valve is to piping system upstream and downstream pressure difference△p as a driving force, controlled by the pilot valve, so that the diaphragm (piston) hydraulic differential operation, all automatically adjusted by the hydraulic so that the main valve plate is all open, all closed or in a state of regulation. When the pressure medium entering the control chamber above the diaphragm (piston) is discharged to the atmosphere or downstream low-pressure area, the pressure value acting on the bottom of the valve disc and below the diaphragm is greater than the pressure value above, relying on the pipeline medium will be the main valve disc pushed to the position of the full open: when the pressure medium entering the control chamber above the diaphragm (piston) can not be discharged to the atmosphere or downstream low-pressure area, the pressure value acting on the top of the diaphragm (piston) is greater than the pressure value below the diaphragm, and the pressure value in the pipeline is greater than the pressure value below the diaphragm. When the pressure value above the diaphragm (piston) is greater than the pressure value below, the medium in the pipeline presses the main valve disc to the fully closed position; when the pressure value in the control chamber above the diaphragm (piston) is between the population pressure and the outlet pressure, the main valve disc is in the regulating state, and the regulating position is dependent on the combined control effect of the needle valve and the adjustable pilot valve in the attached pipeline system.The Adjustable pilot valve can be through the downstream outlet pressure and with its changes and automatically adjust the opening of its own valve port, thus changing the diaphragm (piston) above the control chamber pressure value, controlling the main valve disc adjustment position.
(1) The choice of model selection of hydraulic control valve model, mainly based on the use to choose, when the use, medium, temperature,and working pressure are determined, select the required model.
(2) The choice of structure type selection of hydraulic control valve structure type, mainly depends on the water quality in the piping system. When the water quality is relatively poor, give priority to the use of the DC type in the diaphragm structure, due to the structural characteristics of the DC type, the valve seat in the valve body cavity is tilted, the impurities in the water is not easy to stay in the sealing surface, and therefore not subject to the influence of the water quality, always be able to move flexibly.
The hydraulic control valve is the use of water pressure in the pipeline network to control the valve opening, closing, and opening size of the valve, is a kind of labor-saving, energy-saving automatic valve. Widely used in hydraulic irrigation, high-rise buildings, fire protection systems, municipal water supply and drainage, electric power ,and other water supply network systems. The functions it has are automatic water level control, pressure reduction, pressure relief, pressure holding, regulation, check, water hammer, switch, and many other functions. According to different needs, it can also change the attached pipeline and pilot valve to achieve the required functions.
