| 摘要 |
A by-pass valve (1) is equipped with a fluid delivery duct (2), a return duct (3) for said fluid, a by-pass channel (5) interposed between the delivery duct (2) and return duct (3) to bring the ducts (2, 3) mutually in fluid communication, and a ball closure member (8) housed in a respective seat (9) formed at the by-pass channel (5) to break/open fluid passage in the by-pass channel (5) itself; a sealing element (15) is insertable in the by-pass channel (5) and is engaged with the closure member (8) to maintain said closure member (8) housed inside the seat (9); at least the portion of said by-pass channel (5) included between a fluid inlet region (9a) to the closure member (8) and a fluid outlet region (9b) from the closure member (8) being formed in a single body.
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