| 摘要 |
A cap (10) for cooperating with a flow control element (14) of a valve (15) for a self-priming electric pump (16), the valve (15) being designed to open and close a recirculation duct (13) for the passage of the recirculating fluid from the impeller assembly (17) to an intake duct (18), the cap (10) having a tubular body (11) and, coaxially inside the latter, a mushroom-shaped element (19), which divides, with its head (20), the cap (10) into a first portion (21) and a second portion (22) to be applied with engagement means (23) at an opening (12) of the recirculation duct (13) outward, respectively in the overhead (A) and underhead (B) installation of the self-priming electric pump (16), the axial space occupation of the head (20) and of the stem (28) of the mushroom-shaped element (19) that is extended from the head (20) toward the second portion (22) defining two alternative axial positions of interaction with the flow control element (14) of the valve (15) in the overhead (A) and underhead (B) installation. |
