Adjustable pressure limiting valve and manufacturing method of engine

The utility model discloses an adjustable pressure limiting valve, which comprises a valve body and a valve core arranged in the valve body. The valve body is provided with an oil inlet and an oil outlet, and the valve body is also provided with a sliding valve. The inner cavity of the valve and spool section is the control cavity. The control cavity communicates with the oil inlet. The control cavity is equipped with a return spring. The oil inlet and the control cavity are located on opposite sides of the spool. The slide valve is opposite to the control cavity. One side is provided with a pressure regulating spring, the oil outlet corresponds to the position of the valve core, and the valve body is provided with an oil drain corresponding to the position of the spool valve, and the oil outlet communicates with the oil drain. The adjustable pressure limiting valve of the utility model adjusts the communication amount between the control chamber and the oil drain through the left and right movement of the slide valve, changes the oil discharge amount in the control chamber, and adjusts the pressure of the control chamber. The oil is incompressible, and a relatively large pressure change in the control chamber can be achieved through a small movement of the spool valve, so as to quickly adjust the pressure in the oil inlet.

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