| 摘要 |
Non-return valve device (1) for hydraulic circuits, including a tubular body (2) containing a valve (3) pushed into abutment on a seat (4) of the body by a spring (5) bearing on a sleeve (7) fixed inside the body, the spring (5) being interposed between the body (2) and the sleeve (7), characterised in that the body (2) and the sleeve (7) are welded together by electron bombardment. This fastening means renders the sleeve/body connection undismantleable and leaktight and therefore guarantees the operational reliability of the valve. <IMAGE>
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