Flow and pressure control valve

Abstract

The invention relates to a flow and pressure control valve. The flow and pressure control valve comprises a valve body in which a flow control valve and a pressure control valve are arranged; the flow control valve comprises a first valve element, a first spring cavity and a first-stage spring; the pressure control valve comprises a second valve element, a second-stage spring cavity and a second-stage spring. According to the flow and pressure control valve, by arranging the two control valves, stepping control over oil pressure is achieved, the first-stage flow control valve is mainly used for controlling flow through flow diversion, the second-stage pressure control valve is mainly used for controlling pressure through oil return unloading, the problem that after pressure is out of control, the pressure continuously rises, and consequently braking torque and oil liquid temperature fast raise is efficiently solved, and use is reliable.

Description

technical field [0001] The invention relates to a control valve, in particular to a flow pressure control valve. Background technique [0002] The flow pressure control valve is a component that plays the role of constant pressure relief in the hydraulic system. By controlling the pressure and flow of the liquid flow to meet the requirements of the actuator, it plays the role of pressure stabilization, system unloading and safety protection. At present, there are control valves that use the principle that the hydraulic pressure acting on the spool is equal to the spring force, but when the load pressure of the actuator of the mechanical device changes greatly, the existing flow pressure control valve usually uses What is more important is the single-stage pressure control valve. Its pressure regulation method cannot ensure the stability of the oil pressure in the mechanical equipment, that is, it cannot effectively stabilize the movement speed of the actuator, and when the o...

AI Technical Summary

Problems solved by technology

At present, there are control valves that use the principle that the hydraulic pressure acting on the spool is equal to the spring force, but when the load pressure of the actuator of the mechanical device changes greatly, the existing flow pressure control valve usually uses What is more important is a single-stage pressure control valve. Its pressure regulation method cannot ensure the stability of the oil pressure in the mechanical equipment, that is, it cannot effectively stabilize the movement speed of the actuator, and when the oil pressure reaches a large peak , will cause mechanical device components to suffer huge pressure shocks and cause damage

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