| 摘要 |
A pressure regulator system for a pneumatically or hydraulically actuated we ld 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 (50); and a second line port (48). Two-way valves (52, 54) are provided on the first line port (50) and the second line port (48). A valve sensor (56) connected to a switc h (40) for determining weld force in the weld head (10) is connected to means (82) for simultaneously closing the first line port valve (50) and the secon d line valve port (48) when a desired weld force is attained between one or mo re electrodes (14, 15) and a workpiece (16), thereby maintaining a constant, maximum pressure in the cylinder (12) and consequently maintaining the desir ed weld force between the electrode(s) (14, 15) and the workpiece (16) during t he welding operation.
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