Patent ID: 6830064
Filing Date: 2004-12-14
Classification: F04B,Y10T

Abstract:
A leak control valve, comprising:a valve chamber through which a fluid flows from an inlet connected to a vessel, and to an outlet connected to a vacuum pump; a blocking panel that moves in a floated manner between a first position and a second position, and further moves back and forth in response to a pressure difference between the fluid flow from the inlet and pumping power of the vacuum pump; a seal O-ring functioning as a support of the blocking panel installed at the side wall of said blocking panel, and as a seal for blocking a leak; a sub-pumping unit, implemented in an inner wall of said valve chamber for bypassing said fluid flow from the inlet to the outlet; a first spring having a first end connected to a first side wall of said blocking panel and a second end connected to the outlet, exerting a restoring force at the blocking panel toward the direction to the inlet such that a channel to the outlet is open during a normal operation of vacuum pumping, while the channel to the outlet is closed by the side wall of said blocking panel when the pressure at the side of the inlet becomes high enough to overcome the restoring power due to the leak; and a second spring having a first end connected to a second side wall of said blocking panel and a second end connected to the inlet, exerting a restoring force at the blocking panel toward the direction to the outlet such that the channel to the outlet is open during the normal operation of vacuum pumping and said blocking panel moves back and forth between a first position and a second position in a floated manner, wherein said sub-pumping unit comprises a plurality of conductance tubes and has a U-shape for promoting storage of pressure for a rapid operation of the blocking panel.