1, the direction control valve is divided into one-way valve and reversing valve according to the purpose.
(1) one-way valve: only allow the fluid in the pipeline one-way through, reverse is cut off.
(2) reversing valve: change the on-off relationship between different pipelines, according to the number of working positions of the valve core in the valve body divided into two, three, etc.; According to the number of channels controlled by two, three, four, five, etc.; According to the spool drive mode of separation, motor, electric, hydraulic, etc.
2, the flow control valve is the use of the throttle port area between the valve core and the valve body and the local resistance generated by it to adjust the flow, so as to control the speed of the actuator. Flow control valves are divided into 5 types according to usage.
(1) throttle valve: after setting the area of the throttle port, the throttle valve can make the load pressure change little and the motion uniformity of the actuator is not high. The motion speed of the actuator is basically stable.
(2) speed control valve: when the load pressure changes, it can keep the inlet and outlet pressure difference of the throttle valve as a fixed value.
(3) shunt valve: no matter the size of the load can make the same oil source of two executive components to get the same flow for the same amount of shunt valve or synchronous valve; The proportional flow distribution valve is obtained.
(4) collecting valve: it is to make the flow into the collecting valve according to the proportion of distribution, the effect is opposite to the diverting valve.
(5) Diverting collecting valve: both the function of diverting valve and collecting valve.
3, pressure control valve can be divided into relief valve, pressure reducing valve and sequence valve according to use.
(1) relief valve: it can control the hydraulic system to maintain a constant state when the set pressure is reached. The overflow valve used for overload protection is called the safety valve. When the system fails and the pressure rises to the limit value that may cause damage, the valve port will open the overflow to ensure the safety of the system.
(2) pressure reducing valve: it can control the branch loop to get the stable pressure lower than the main loop oil pressure. Pressure reducing valve according to its control of the pressure function is different, and can be divided into constant value of pressure reducing valve, pressure reducing valve and pressure reducing valve.
(3)Sequence valve: can make an executive component action, then in order to make other executive components action.