Patent ID: 6572075
Filing Date: 2003-06-03
Classification: F16K

Abstract:
A valve for controlling a flow rate of gas, comprising:a valve body having a gas-flowing passage, said gas flowing passage including a hole; a valve disc for closing said hole; a valve operating member for operating said valve disc; an actuator for operating said valve operating member, wherein said actuator comprising a motor, a horizontal drive shaft that is an output shaft of said motor, an eccentric cam secured to said horizontal drive shaft, and a slider connected to said valve disc and movable vertically by said eccentric cam; an emergency cut-off device connected to said valve disc and releasably connected to said actuator; means for releasing said emergency cut-off device from said actuator in case of an emergency; means for urging said valve disc to said hole when said emergency cut-off device is released from said actuator; and, said emergency cut-off device comprising a first link having a distal end connected to said slider and a proximal end rotatably connected to said valve operating member, a roller rotatably supported on a distal end portion of said first link, a second link having a distal end rotatably connected to an intermediate portion of said first link and a proximal end rotatably connected to said slider of said actuator.