| 摘要 |
<p>A plate intended to close heads of thermal radiators manifolds is provided with a recess (4), threaded on one of its sides, having a through hole (6) with reduced diameter on the bottom of the recess (4). The linking section between the recess (4) and the through hole (6) is so shaped to provide a valve seat (11), which is engaged by a threaded dowel (8) introduced in the recess (4). When screwing the threaded dowel (8), sealing between recess (4) and through hole (6) is provided. A closing cap for radiators manifolds or for radiators is similarly provided with a recess (21), made communicating with the opposite side of the cap (15), by means of a through hole (22) which is threaded and provided with longitudinal grooves (23). The dowel (25) is divided in two parts, one having reduced diameter (27) and being threaded to engage the through hole (22) until a frustum of cone section (29) of the dowel abuts against a valve seat (30) provided on the bottom of the recess (21).</p> |
