Atmosphere Pressure Control in Vacuum Laser Powder Bed Fusion Low pressure SLM fusion process Features: The molten pool is more stable and reduces porosity. Low-pressure atmosphere requirements: Fast and accurate air pressure control is reached within the process window of 5kPa~101kPa. Pressure Control Control method: two-way control method, adjusting upstream air intake electronic air flow control valve and downstream electric ball valve at the same time. It can also adjust the air intake flow and vacuum pump exhaust rate. For further information on electronic air flow control valve, please visit https://www.genndih.com/proportional-flow-control-valve.htm Sensor: vacuum pressure sensor, the measurement range is 5kPa~101kPa, and the accuracy is ±0.2%. Controller: two-way PID controller, two-way control function