| 摘要 |
An anti-freezing valve (1) comprises: a valve body (2) made of metal material (M), defining a passageway (5) for a liquid; an open/close member (9), mounted displaceable in the valve body (2), an anti-freezing arrangement. The valve body (2) is a valve body obtained by casting, which defines a valve seat (8), with respect to which the open/close member (9) is displaceable in a slidable manner between a raised position of opening and a lowered position of closing of the passageway (5). Embedded in the metal material (M) constituting the valve body (2) is an axially extended hollow member (13), belonging to the anti-freezing arrangement, for the passage of a thermovector fluid (F), the hollow member (13) having respective ends (14) accessible from outside the valve body (2), for connection to a circuit of the thermovector fluid (F). The valve (1) has preferred application on vehicles for the transport of liquids, in particular tankers, gully emptiers and similar vehicles for transporting waste water and sewage. |
