Detailed Description Of Hydraulic Valves

  Detailed description of hydraulic valves

  An element used in a hydraulic drive to control liquid pressure, flow, and direction. Which control the pressure called the pressure control valve, hydraulic valves the control flow called the flow control valve, control the continuity and flow direction called the direction control valve. The pressure control valve is divided into relief valve, pressure reducing valve and sequence valve according to its application.

  Relief valve: can control the hydraulic system to maintain a constant state when the set pressure is reached. A relief valve for overload protection is called a safety valve. When the system fails, the pressure rises to the limit may cause damage, the valve port will open and overflow, to ensure the safety of the system.

  Pressure relief valve: hydraulic valves can control the branch circuit to get lower than the main circuit pressure pressure. Pressure relief valve according to its control of the pressure function is different, but also can be divided into the value of the pressure relief valve (output pressure is constant)? Differential pressure valve (input and output pressure difference is set) and the ratio of pressure reducing valve (The input and output pressure to maintain a certain ratio).

  Sequential valve: can make an implementation of components (such as hydraulic cylinders? Hydraulic motor, etc.) after the action, and then in order to make other executive elements.

  (1) Throttle: After adjusting the orifice area, the moving speed of the actuator with little change in load pressure and less uniformity of movement is basically maintained.

  (2) speed control valve: the load pressure changes can keep the throttle valve inlet and outlet pressure difference for the set value. hydraulic valves In this way, after the throttle area is set, regardless of how the load pressure changes, the governor can keep the flow through the throttle constant, thus stabilizing the speed of the actuator.

  (3) diverter valve: regardless of the size of the load, can make the same oil source of the two actuators are equal flow equal to the diversion valve or synchronous valve; get proportional distribution of the proportion of the flow distribution valve.

  (4) the collector valve: the role of the opposite with the diversion valve, hydraulic valves so that the flow into the flow of the proportion of the distribution of the valve.

  (5) shunt flow valve: both flow distribution valve and the two functions of the collector. Directional control valves are divided into check valves and reversing valves according to their application. Check valve: only allows the fluid in the pipeline in one direction, reverse that cut off. Directional valve: change the relationship between the different pipe according to the valve in the valve body in the working position of the number of two, three, etc .; hydraulic valves according to the number of channels controlled by the two links, three, four, five Etc .; according to the spool drive way manual, mobile, electric, hydraulic and so on.