Hydraulic powerControl valveAccording to the structure, it can be divided into two types: diaphragm type and piston type. The working principle is the same. Both the above downstream pressure difference △P is the power, which is controlled by the pilot valve, so that the diaphragm (piston) hydraulic differential operation is completely automatically adjusted by hydraulic power. So that the main valve valve disc is fully opened or fully closed or in an adjustment state.When the pressure water 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, so push the main valve disc to fully open When the pressure water entering the control chamber above the diaphragm (piston) cannot be discharged to the atmosphere or downstream low pressure area, the pressure value acting on the diaphragm (piston) above the pressure value is greater than the pressure value below, so the main valve disc When the pressure value in the control chamber above the diaphragm (piston) is between the inlet pressure and the outlet pressure, the main valve disc is in an adjustment state, and its adjustment position depends on the needle valve and the adjustable position in the catheter system. The combined control function of the pilot valve.The adjustable pilot valve can open or close its own small valve port through the downstream outlet pressure and change with it, thereby changing the pressure value of the control chamber above the diaphragm (piston).Control valveThe adjustment position of the disc.
According to different structures and control methods, hydraulic control valves can be divided into the following types: remote control float valve (control liquid level), pressure reducing valve, slow closing check valve, flow control valve, pressure holding/relief valve, hydraulic electric Control valve, water pump control valve, differential bypass valve, emergency shut-off valve, etc.