| 摘要 |
A fitting 1 is screwed into the high pressure orifice 14 of a jack 1. A stopper 26 is mounted so that it may slide on a rod 21 between a rest position against an adjustable stop-piece 24 at the end of the rod 21 and a stoppage position against a bearing surface 27 provided at the end of the screwed end-piece 12. The rod 21, surrounded by a spring 28 for returning the stopper, is fixed at its opposite end to a perforated plate 47 mounted inside the inner cone 36 of a counter-fitting 32. The whole assembly is held by one single nut 38. Use for placing the anti-return upstream of any possible leak relative to the backflow direction in case of pipe rupture. <IMAGE>
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