| 摘要 |
A pressure regulator system for a pneumatically or hydraulically actuated weld head (10). The weld head (10) includes a switching valve (21) comprising several ports: an inflow port (44) attached to a source of pressurized gas, preferably air; an exhaust port (46); a first line port (48); and a second line port (50). Two-way valves (52, 54) are provided on the first line port (48) and the second line port (50). A valve sensor connected to a switch (40) for determining weld force in the weld head (10) is connected to means (82) for simultaneously closing the first line port valve (52) and the second line valve port (54) when a desired weld force is attained between one or more electrodes (14, 15) and a workpiece (16), thereby maintaining a constant, maximum pressure in the cylinder (12) and consequently maintaining the desired weld force between the electrode(s) (14, 15) and the workpiece (16) during the welding operation.
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