Patent ID: 7455076
Filing Date: 2008-11-25
Classification: F16K,Y10T

Abstract:
1. An apparatus for controlling pressure in a semiconductor manufacturing system, provided in an exhaust line between a reactive chamber and a vacuum pump, comprising: a valve body having at least one exhaust hole in the exhaust line; a first valve slidably movable inside the exhaust hole for opening or closing at least a portion of the exhaust hole, wherein said first valve has a substantially circular plate structure; a second valve slidably movable along at least one external surface of the first valve for opening or closing a hole formed in the first valve, wherein said second valve opens or closes at least a remaining portion of the exhaust hole which is not covered by the first valve; a first driving device for driving the first valve and a second driving device for driving the second valve to an open or closed position based on the amount of pressure in the reactive chamber; and a control device electrically connected to the first and second driving devices for checking the pressure in the reactive chamber and controlling each of the driving devices based on the internal pressure of the reactive chamber.