Patent ID: 6321772
Filing Date: 2001-11-27
Classification: B65G,G05D,Y10S,Y10T

Abstract:
A vacuum pressure-adjusting apparatus for supplying an adjusted predetermined vacuum pressure to a fluid pressure-operated apparatus to be operated by said vacuum pressure, said vacuum pressure-adjusting apparatus comprising:a housing including a vacuum port to be connected to a vacuum pressure supply source, a pressure regulator port to be connected to said fluid pressure-operated apparatus, and an atmospheric port to make communication with atmospheric air;a vacuum chamber closed by a diaphragm;an operating section including a handle provided rotatably at one end in an axial direction of said housing, for setting a predetermined vacuum pressure in accordance with a rotating action of said handle;a valve plug provided displaceably in said axial direction in said housing, for seating on a seat section to thereby block communication between said vacuum port and said pressure regulator port; andan air-drawing mechanism for drawing air introduced from said atmospheric port into said vacuum chamber and, after passing through said vacuum chamber, from said pressure regulator port toward said vacuum port via a minute clearance between said seat section and said valve plug while said valve plug is seated on said seat section, wherein said minute clearance prevents said valve plug while seated on said seat section from biting into said seat section.