The hydraulic system of injection molding machine is the representative example, it need to controlcylinder speed and hold pressure, so it indeed to use pressure and flow rate multiple valve.
The cylinder drives a piston extraction and play materials, and by the one-way valve to control the flow of materials, the magnetic switch controlcylinder stroke, which adjust the filling volume.
通过气缸带动一个活塞抽取和打出物料，并由单向阀控制物料流向，由磁环开关控制气缸行程，即调节灌装量。
3
In pneumatic position servo system with proportional directional control valve and controlcylinder, the centre adjust emt voltage is one of the important factors that influence control precision.