The pressure control valve refers to a valve used to control and regulate the pressure of the fluid flow in the hydraulic system. This kind of valve works by using the principle that the liquid pressure acting on the valve core is balanced with the spring force.
Pressure control valve is a general term for valves that control and regulate the pressure of liquid flow, referred to as pressure valve. It adopts a method to balance the hydraulic pressure acting on the valve core with the force of the broad core spring to establish and maintain the working pressure of the controlled liquid. If the spring force is adjustable, the pressure of the controlled liquid can be changed accordingly, so as to achieve the purpose of controlling and adjusting the pressure of the liquid flow. Pressure valves are used in parallel in the oil circuit system. When the pressure of the controlled liquid rises and exceeds the preset pressure of the spring due to external reasons, the balance relationship between the spool and the spring is destroyed. With this elbow, the spool will be forced to move, opening the passage to drain (overflow) to the oil return line. The pressure of the controlled oil is still maintained at the level of the spring preset pressure; sometimes the spool movement is not to open the oil return passage, but to change the flow section of its special throttle and pressure relief port, that is, to change its pressure drop to make The working pressure of the pre-adjusted pressure reducing oil circuit remains unchanged; sometimes the oil pressure is deliberately increased so that it enters another working oil circuit to achieve the purpose of sequential action.