Swaging apparatus with timed pre-fill

Details Swaging apparatus with timed pre-fill Swaging apparatus with timed pre-fill

B - Operations, Transporting

21

J

78/4

B21J 7/18 (2006.01) B21D 26/02 (2006.01) B21D 39/20 (2006.01)

Patent

CA 1213761

ABSTRACT OF THE DISCLOSURE In an apparatus for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure, the flow of relatively low pressure fluid from a pressure source to an intensifier is permitted or interrupted by a control valve. During a prefill period, a prefill valve causes the low pressure fluid to bypass the low pressure input side of the intensi- fier and flow directly to the high pressure side and then to a mandrel. Thereafter, the low pressure fluid is caused to enter the low pressure side of the intensifier to increase the pressure in the mandrel during a swaging period. A pressurization sensor, which is connected to the input and output sides of the prefill valve, contains a piston which is movable in response to the difference in the pressures at these two points to produce a termination signal which, after a delay, actuates the control signal at the end of the swaging period.

454287

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