The introduction of hydraulic valve and pressure control valve
The function of hydraulic control valve (hydraulic valve) in hydraulic system is to control and regulate the flow direction, pressure and flow of oil in hydraulic system, so that the actuator and its driving mechanism can obtain the required movement direction, thrust (torque) and movement speed (speed). No hydraulic system, no matter how simple, it can not lack hydraulic valves. Through different combinations of hydraulic valves, hydraulic machinery for the same technological purpose can form a variety of hydraulic system solutions with distinct oil circuit structure. Therefore, the hydraulic valve is the most variety and specifications of hydraulic technology, the most widely used and the most active part (components). According to established requirements, whether new design or operation of the hydraulic system have the normal and reliable operation, to a large extent, it depends on the performance of the various hydraulic valves used and the parameters match is reasonable.
Pressure control valve is divided into relief valve, pressure reducing valve and sequence valve according to usage. (1) Relief valve: it can control the hydraulic system to maintain a constant state when the pressure is set. The relief valve used for overload protection is called a safety valve. When the system fails and the pressure rises to a limit value that may cause damage, the valve opens and overflows to ensure the safety of the system. (2) Reducing valve: it can control the branch circuit to get stable pressure than the main circuit. Pressure relief valve can be divided into constant value pressure relief valve (output pressure is constant), constant difference pressure relief valve (input and output pressure difference is constant) and constant ratio pressure relief valve (input and output pressure keeps a certain proportion). (3). Sequence valve: it can make one actuator (such as hydraulic cylinder, hydraulic motor, etc.) action, and then in order to make other actuators action.