Patent ID: 6283445
Filing Date: 2001-09-04
Classification: F16K

Abstract:
A gate valve comprisinga valve body provided in a sealed chamber, capable of opening and closing an opening portion of the sealed chamber and then sealing the opening portion by inclining with respect to said opening portion,a valve rod to one end portion of which said valve body is fixed, held so that it can move straight and incline, provided so as to project from an interior of said sealed chamber to an outside of the sealed chamber, and provided so as to hold the sealed state of said sealed chamber by a sealing means,an inclination mechanism connected to said valve rod and inclining the valve rod, said inclination mechanism comprising: a roller rotatably provided on the other end of said valve rod; a roller receiving member formed with a first holding portion provided facing the other end portion of said valve rod, capable of holding said roller, and holding said roller when said valve rod moves straight in a direction opening and closing said opening portion, with an inclined surface continuous with the first holding portion, capable of engaging with said roller, and engaging with the roller so as to make said valve rod incline, and with a second holding portion continuous with the inclined surface, capable of holding said roller, and holding the roller when said valve rod is inclined up to a predetermined angle and moved straight by said driving means, and a limiting means for limiting the straight movement of said valve rod at a predetermined position at which said valve body closes said opening portion and releasing the holding state of said roller receiving member of said roller by the first holding portion,a driving means connected to said valve rod via said inclination mechanism and supplying a drive force required for the straight movement and inclination of said valve rod, anda holding means for holding said valve rod and said inclination mechanism moved straight by said driving means so that they can freely move in a horizontal direction.