Patent ID: 8496022
Filing Date: 2013-07-30
Classification: G05D,Y10T

Abstract:
1. A device for supplying gas divided to a chamber from a gas supply facility equipped with a flow controller, the device comprising: (a) a gas supply device disposed to supply a specified quantity of gas, while dividing the specified quantity of gas at a specified flow rate ratio Q (b) a first open/close valve and a second open/close valve that are installed on the first branch supply line and the second branch supply line, respectively; (c) a first bypass line that is disposed on a downstream side of the first open/close valve and branched from the first branch supply line; (d) a second bypass line that is disposed on a downstream side of the second open/close valve and branched from the second branch supply line; (e) a pressure type division quantity controller that is connected to the first bypass line and the second bypass line, wherein the pressure type division quantity controller controls flow rate in the first branch supply line and in the second branch supply line; (f) a first pressure sensor that is disposed to measure pressure inside the first branch supply line; (g) a second pressure sensor that is disposed to measure pressure inside the second branch supply line, wherein Q (h) a control device disposed to regulate a degree of opening of the pressure type division quantity controller in order to reduce a difference between actual pressure of one of the plurality of branch supply lines and a set pressure to reach the specified flow rate ratio Q