| 摘要 |
<p>A supply and control apparatus and method for a joint-forming machine, a joint-forming machine embodying same and jointed material made by use of same. …<??>In a machine 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 14 is permitted or interrupted by a control valve 40. An actuator 64 moves the control valve 40 between its flow-permitting and flow-interrupting positions (Figure 1 and Figure 2 respectively) in response to a control signal. In a pressure sensor 66, which is connected to the input and output sides of the control valve 40, a piston 70 is movable in response to the difference in the input and output pressures to produce, by switch 88, the control signal when a predetermined comparative pressure relationship exists. …<??>An intensfier 42 multiplies the pressure of the fluid supplied to the mandrel 59 for a period determined by an adjustable delay relay 90.</p> |
