The single-stage pressure regulating circuit of the overflow valve of the four column hydraulic press is composed of a quantitative pump, an overflow valve and a hydraulic cylinder, which is the most basic pressure regulating circuit. It has the following characteristics:
The opening pressure of the overflow valve can be adjusted by the pressure regulating tension spring. If the pre tightening amount of the pressure regulating tension spring of the overflow valve is set, the maximum value of the oil supply pressure can be set. The practical working pressure of the hydraulic press system is determined by the load.
When the external load pressure is less than the set pressure of the relief valve, there is no overflow flow at the relief valve of the hydraulic press. At this moment, the relief valve acts as a safety valve. When the manual relief valve is used in a single stage of the relief valve, the pressure of the relief valve will not be adjusted in a working cycle of the system pressure regulating circuit
