Patent ID: 6039240
Filing Date: 2000-03-21
Classification: B23K

Abstract:
A backpressure controlling device for welding gas comprising a generally cylindrical housing, a water inlet in the wall of said housing and a water outlet at the bottom of said housing, said water inlet and said water outlet defining a water volume space in said housing, a gas inlet tube and a gas outlet tube, said gas inlet tube having a length such that one end thereof can extend below said water inlet and the other end thereof extending out of said housing for connection to a pipeline carrying purge gas, and said gas outlet tube extending from a space above said water outlet and communicating with the exterior of said housing said housing being of a size such that the volume of the space above said water inlet is at least about one and one-half times as great as said water volume space, whereby when said water volume space is filled with water, said water is unable to flow out of said gas inlet tube or said gas outlet tube at any position of said housing.