Patent ID: 6433308
Filing Date: 2002-08-13
Classification: F16K,Y10T

Abstract:
A high vacuum valve comprising a first opening (14) and a second opening (15) formed through a front surface wall (22) and a back surface wall (23) of a main valve body (11) having a valve chamber (16) at the inside respectively; a valve seat (24) formed at an inner portion of said first opening (14) or said second opening (15); and a valve plug (18) connected to a proximal end of a valve shaft (19) for making rectilinear motion; said valve shaft (19) being inserted in a non-contact state into a central bore (27) of an upper wall (26) of said main valve body (11); a side surface of said valve shaft (19) at the outside of said valve chamber (16) being covered with a bellows (37) in a non-contact state; an air-tight state being given between a forward end of said bellows (37) and a forward end of said valve shaft (19); and an air-tight state being given between a proximal end of said bellows (37) and surroundings of said central bore (27) of said upper wall (26); in which said valve plug (18) arrives at a position opposed to said valve seat (24) in accordance with said rectilinear motion of said valve shaft (19); and then said valve plug (18) is pressed against said valve seat (24) in accordance with swinging motion of said valve shaft (19) to close a valve (31); wherein a heater (77) is arranged in a tight contact manner in said valve shaft (19); and a wiring line (78) for supplying electric power from the outside of said high vacuum valve is connected to said heater (77).