Patent ID: 7841578
Filing Date: 2010-11-30
Classification: F16K

Abstract:
1. A vacuum valve, comprising: two ports connected to a vacuum chamber and a vacuum source, respectively; a valve seat formed in a halfway of a flow path connecting the two ports; a main valve portion including a poppet-type valve member contacting and separating from the valve seat that opens and closes the flow path; and an operating portion that performs an opening and closing operation of the valve member, wherein a housing of the main valve portion includes a cylindrically shaped housing main body having a uniform thickness formed by a press-drawing process or a spinning process for a plate material made of metal or a ring-shaped material made of metal, and includes two cylindrically shaped port members forming the two ports, wherein the housing of the main valve portion is assembled by joining each of the two port members with an opening portion for a port formed at each of a first end in an axial direction of the housing main body and a side surface thereof, wherein at a second end in the axial direction of the housing main body, a flange-shaped attaching portion having a uniform thickness is formed by inwardly bending the end portion of the housing main body, and a supporting seat member provided with a round inner hole having a diameter greater than an inner diameter of the attaching portion is attached onto the attaching portion, wherein the operating portion is attached onto the supporting seat member, and further a ring-shaped sealing member and a ring shaped supporting plate are sandwiched between the attaching portion and the operating portion in an inner hole of the supporting seat member, and wherein ends of a bellows are respectively connected to the supporting plate and the valve member.