B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/91
B21D 22/10 (2006.01) B21D 39/06 (2006.01) B21D 39/20 (2006.01)
Patent
CA 1192029
TITLE OF THE INVENTION APPARATUS FOR SUPPLYING AND CONTROLLING HYDRAULIC SWAGING PRESSURE 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 pressurized fluid from an adjustable pressure reduction valve is permitted or interrupted by a control valve. An actuator moves the control valve between its flow permitting and interrupting positions in response to a control signal, In the sensor, which is connected to the input and output sides of the control valve, a piston is movable in response to the difference in the input and output pressures to produce the control signal when a predetermined comparative pressure relationship exists.
404570
Gowling Lafleur Henderson Llp
Haskel Inc.
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