5 maintenance is convenient, pneumaticballvalve structure is simple, the sealing ring is generally active, demolition and replacement are more convenient.
维修方便，气动球阀结构简单，密封圈一般都是活动的，拆卸更换都比较方便。
2
The material delivery system is provided with a controller that is respectively connected with the driving motor of the metering pressure pump and the pneumaticballvalve.
送料系统设置有控制器，分 别连接计量加压泵的驱动电机和气动球阀。
3
On-off valve shall be pneumaticballvalve, and the leakage class is V or VI. All the valve accessories such as limit switches, solenoid valves and filter regulators shall be supplied with the valves.