5 Fig. 6-5. Always use wrench to open acetylene cylinder valve; leave wrench in place after opening valve. Fig. 6-6. Always tighten all connection nuts firmly with a wrench. Attach the oxygen hose to the oxygen regulator and to the oxygen connection on the torch. The torch connection is usually identified by a marking in the torch body or in the torch handle, opposite the oxygen valve. Cutting machine torches usually have two oxygen connections, one for the oxygen supplied to the cutting jet, one for the oxygen used on the preheat flames. Unless an adaptor is used on the torch to unite these connections, such a torch requires two oxygen hoses, two regulators, and two oxygen sources. Attach the acetylene hose to the acetylene regulator, and to the acetylene connection on the torch. On some torches, the acetylene connection may not be specifically identified, even though the oxygen connection is labelled. Continued on next page...
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