How is the hydraulic control valve classified?

According to the structure, the hydraulic control valve can be divided into two types: diaphragm type and piston type. The working principle is the same. The pressure difference P above and above is the power. It is controlled by the pilot valve to make the diaphragm (piston) hydraulic differential operation, completely controlled by hydraulic power. Adjust so that the main valve disc is fully open or fully closed or in a regulated state.
According to the structure, the hydraulic control valve can be divided into two types: diaphragm type and piston type. The working principle is the same. Both the above-mentioned downstream pressure difference ΔP is the power, which is controlled by the pilot valve to make the diaphragm (piston) hydraulic differential operation, completely hydraulic. Automatic adjustment so that the main valve disc is fully open or fully closed or in a regulated state. When the pressure water entering the control chamber above the diaphragm (piston) is discharged to the atmosphere or the downstream low pressure zone, the pressure acting on the bottom of the valve disc and below the diaphragm is greater than the pressure value above, so push the main valve disc to fully open When the pressure water in the control chamber above the diaphragm (piston) cannot be discharged to the atmosphere or the downstream low pressure zone, the pressure acting above the diaphragm (piston) is greater than the pressure below, so the main valve disc will be used. Pressed to the fully closed position; when the pressure in the control chamber above the diaphragm (piston) is between the inlet pressure and the outlet pressure, the main valve disc is in an adjusted state, the adjustment position depends on the needle valve in the catheter system and is adjustable The joint control of the pilot valve. The adjustable pilot valve can open or close its own small valve port by the downstream outlet pressure and change with it, thereby changing the pressure value of the control chamber above the diaphragm (piston) and controlling the adjustment position of the square valve disc.

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