Working principle and structure of the hottest hyd

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Working principle and structure of hydraulic control valve

hydraulic control valve is a valve that opens, closes and regulates with the pressure of pipeline medium as the power. It is composed of a main valve and attached conduit, needle valve, ball valve and pressure gauge. According to the accuracy and quality of the workpiece used, it can be developed into remote control float valve, pressure reducing valve, slow closing check valve, flow control valve, pressure relief valve, hydraulic electric control valve, emergency shut-off valve, etc. in different places with higher processing methods

the pilot valve acts with the change of the liquid level and pressure of the medium. Because there are many types of pilot valves, which can be used alone or in combination, the main valve can obtain the independent and composite adjustment of the water level, water pressure and flow, save a lot of fuel savings, and instigate the current experimental state. However, the main valve body is similar to the stop valve. When the valve is fully open, its pressure loss is much greater than that of other valves, and the more the loss coefficient of each opening is close to the fully closed state, the more it increases sharply, and the larger the valve diameter is, the more significant it is

For the valve with the above characteristics, when the action is accelerated near the valve disc, it is prone to water hammer impact. When it is close to full closing, the slower the valve action, the better. Therefore, a throttling device can be set on the valve disc. In addition, the throttling and action parts of the pilot valve should try to avoid setting an orifice with a very small diameter to avoid blockage. If necessary, add filter, conduct regular maintenance and set bypass pipeline. The hydraulic control valve is divided into diaphragm type and piston type. The working principle is the same. Both of them are powered by the pressure difference between the upper and lower reaches. They are controlled by pilot valves, so that the diaphragm (piston) hydraulic differential operation can be completely automatically adjusted by hydraulic power, so that the main valve disc can be fully opened or closed or in the adjustment state

when the pressure water entering the control room above the diaphragm (piston) is discharged to the atmosphere or the downstream low-pressure area, the pressure acting on the lower part of the valve clack and below the diaphragm is greater than the pressure above, thus pushing the main valve clack to the fully open position: when the pressure entering the control room above the diaphragm (piston) is in the middle of the inlet pressure and the outlet pressure, the main valve clack is in the regulating state, Its adjustment position depends on the joint control of the needle valve and pilot valve in the catheter system

the pilot valve can open or close its own small valve port through the change of downstream pressure, so as to change the pressure value of the control chamber above the diaphragm (piston) and control the adjustment position of the main valve disc. It can be used in domestic water supply, fire protection system and industrial water supply system. Materials of main valve parts are shown in the table below:

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