| 摘要 |
<p>A non-return valve having a guided obturator, guided at a stem portion and at a head portion within a guiding member situated within a chamber. The chamber has a shoulder portion which acts as a seat for the obturator head, and supports an annular flexible seal. The annular flexible seal is L-shaped, with a flexible lip which conforms to the contour of the edge of the obturator head. The obturator stem has a cruciform cross section.</p> |
