Directional control valves are one of the core elements in a hydraulic circuit. They help directing the fluid to different components in the system.方向控制阀是液压油路中的核心部件，可以用来改变流体的方向。
Directional control valves perform only three functions:方向控制阀有三种功能
Stop fluid flow 让流体停止运动
Allow fluid flow 允许流体通过
Change direction of fluid flow 改变流体方向
There is a part called «spool» inside control valve which can be operated mechanically or electrically. The movement of the spool lets oil flow or blocks the oil flow in other words it controls the movement of fluid. Hidros provide monoblock directional control valves with different capacities and spool control options such as hydraulic, pneumatic or with cables/joysticks.
方向控制阀中的阀芯可以被手动操控或者电控。正是因为阀芯的运动可以让流体的运动方向改变。
SVV90 valves are 6 ways, 2 positions (6/2) solenoid operated valves. They are used for selective connection of different cylinders/hydraulic motors in the application. When valve is de-energised, oil directs from D & C ports to first actuator. When valve coil is energised, oil directs from A & B ports to second actuator.SVV90是一种电磁操控的两位六通控制阀，它们被用来切换不同的油缸或者马达。当阀断电的时候，C、D通往第一个执行器，通电的时候，A、B通往第二个执行器。
