Flow control valve and directional control valve
The flow rate is regulated by adjusting the throttle area between the spool and the valve body and the local resistance, so as to control the movement speed of the actuator. Flow control valves are divided into 5 types according to their usage. (1) Throttle valve: after adjusting the throttle area, the movement speed of the actuator which can make the load pressure change little and the motion uniformity request not high basically remains stable. (2). Speed control valve: when the load pressure changes, the pressure difference between the inlet and outlet of the throttle valve can be maintained as a fixed value. In this way, after the throttle area is adjusted, no matter how the load pressure changes, the speed control valve can keep the flow through the throttle valve unchanged, so that the movement speed of the actuator is stable. (3). Diverting valve: no matter the load, the two actuators of the same oil source can get the same flow rate as the equal flow rate dividing valve or synchronous valve and the proportional flow rate dividing valve is obtained. (4). Collecting valve: opposite to the diverting valve, the flow of the flow into the collecting valve is proportionately distributed. (5). Distributary collecting valve: it has two functions of shunt valve and collecting valve.
Directional control valve is divided into one-way valve and reversing valve according to usage. (1). One way valve: it only allows fluid to be connected in a single way in the pipeline, and cuts off in reverse direction. (2) Directional valve: it can change the connection between different pipelines. According to the working position of the valve spool in the valve body, it is divided into two, three and so on. According to the number of channels under control, it is divided into two-way, three-way, three-way, three-way, five-way and so on. According to the valve spool driving mode, it is divided into manual, mobile, electromagnetic, hydraulic, etc.