| 摘要 |
<p>The pump (1) is provided with a substantially cylindrical pump casing (2) provided with an axial suction duct (4) and opposing tangential delivery ducts (5, 6) and with an impeller (7) housed in the pump casing (2) coaxial to the suction duct (4); the delivery ducts (5, 6) are both provided with respective automatic non-return valves (15) arranged to selectively allow a unidirectional flow in one of the delivery ducts (5, 6) in accordance with the direction of rotation of the impeller (7).</p> |
