Patent ID: 6769445
Filing Date: 2004-08-03
Classification: F16K,Y10T

Abstract:
A valve drive device having a plurality of openings for communicating with an inflow pipe and an outflow pipe, said valve drive device comprising:a valve element for opening and closing said openings; a driving member for driving said valve element; a rotation transmitting member for transmitting rotation from said driving member to said valve element; a valve seat plate in which said openings are formed and on which said valve element is slid in pressure contact therewith so as to open and close said openings; and a housing for gastightly sealing said valve seat plate and said valve element together with said driving member and said rotation transmitting member so as to form a hermetically sealed space; and a holding device provided for tentatively retaining said valve element at a spaced-apart position spaced apart from said valve seat plate; wherein said valve element is retained at the space-apart position when said valve seat plate and said housing are welded together.