What is the structure and working principle of the Daikin hydraulic oil pump?

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The cone valve of the Daikin hydraulic oil pump is closed, and the oil pressures in the upper and lower chambers of the main spool are equal to that of spring 10, causing the main spool to remain fully open at the bottom of the valve port, thereby preventing any pressure reduction. When the outlet pressure of the valve rises above the pressure set by the pressure regulating spring 11, the cone valve opens. When the pressure difference between the upper and lower chambers of the main spool exceeds the pre-tensioning force of spring 10, the main spool 7 rises, thereby reducing the gap at the pressure reduction port; as a result, the fluid resistance increases and the outlet pressure P2 decreases. On the contrary, exports have recovered. The Denisun pump can maintain a stable outlet pressure at the set value by automatically adjusting the valve opening. The valve port of the pressure relief valve is normally open. Since the inlet and outlet are connected to pressure oil, the drain port separates the tank. Adjust the compression force of the pilot valve spring to regulate the pressure of the pressure relief valve. Daikin hydraulic oil pumps, and the Daikin mother-and-child pump V series, feature a vane and hydraulic balance structure that reduces the pressure exerted by the vanes on the stator, resulting in more stable performance and a longer service life. The pump core contains 12 vanes, and the vane system reduces the amplitude of flow pulsations, resulting in low system noise levels. Four different relative positions for multi-displacement, multi-axis extension, and outlet, providing greater flexibility for users. The plug-in structure of the pump core makes on-site maintenance easier. V-series vane pumps are used in plastic machinery, shoe and leather processing equipment, machine tools, die-casting, and metallurgical equipment – high-performance vane pumps. 1. Application of the large oil pump pressure relief valve in hydraulic systems. Hydraulic pumps usually need to supply oil to many actuating components. Control is required when the actuating elements needed to apply pressure are different. If the oil supply pressure required by the actuator is lower than that of the hydraulic pump, a pressure relief valve can be connected in series in that branch pipeline. The required pressure is regulated by a pressure reducing valve. Pressure-reducing circuits are often used for control oil circuits, clamping oil circuits, and lubrication oil circuits. The VQ series of mother-and-child vane pumps feature a hydraulic-balanced vane structure and a 10-vane system design, enabling higher pressures of up to 21 Mpa. The use of a floating plate allows for automatic compensation of gaps, thus maintaining high volumetric efficiency even under high pressure. The side plates are made of dual-metal materials to enhance resistance to wear, extending the pump’s service life. The VQ series vane pumps are used in construction machinery as high-pressure, high-performance mother-and-child vane pumps. 2. If the inlet pressure P1 of the Daikin plunger pump increases due to external interference. The outlet pressure P2 also rises. The main spool moves upward, the opening of the main valve decreases, P2 drops, and equilibrium is reached at a new position; the outlet pressure remains unchanged, and vice versa. In this way, the safety valve can utilize the outlet pressure and the force feedback mechanism to automatically control the opening degree of the valve, thereby maintaining a constant outlet pressure; hence, it is called a constant-value pressure reducing valve.