| 摘要 |
The invention relates to an automatic plant for cutting or welding by gas jet, especially by plasma jet, comprising a torch (T), a first pilot-gas line (L1), a second cutting- or welding-gas line (L2), control means (MP), first means (MR1) for adjusting the pressure of the pilot gas in the line (L1) and second means (MR2) for adjusting the pressure of the gas in the line (L2). The first adjustment means (MR1) are fitted in the line (L1) and controlled by control means (MP). A pneumatic control line (LP) pneumatically connects the line (L1) to the adjustment means (MR2) in order to enable the pressure of the cutting or welding gas to be adjusted in the second line (L2) on the basis of the pressure of the pilot gas in the line (L1), by acting on said second adjustment means (MR2).
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