Abstract:
An improved bulk fluid distribution system for controlling the pressure of a fluid in a supply line to a semiconductor manufacturing process. The distribution system includes a pump-based engine with either a pressure vessel or a pulse dampener. In the pump-pressure vessel embodiment, a controller monitors the pressure of the fluid in the supply line and adjusts the dispense pressure of the vessel. In the pump-pulse dampener embodiment, the controller monitors the pressure of the fluid in the supply line and adjusts the flow rate of the pump to maintain the pressure in the supply line at a predetermined setpoint.
Abstract:
An improved bulk fluid distribution for supplying process fluids to semiconductor process tools. The improved system having an alternating pressure vessel engine substantially eliminates pressure fluctuations in the bulk fluid supply line due to head losses from the changing weight of the fluid in the dispensing vessels. The system also enables flexible control of the flow conditions of the fluid in the fluid supply line.