| 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. |
| 主权项 |
1. A tank valve comprising:
a hollow valve body made of metal material integrally defining a front wall, a back wall and a side wall, the front wall, the back wall and the side wall each having an inner side, an outer side and a thickness, the inner side of the front wall and the inner side of the back wall being spaced from each other, wherein the front wall, the back wall and the side wall define a hollow volume for passage of a liquid, a lower portion of the side wall forming a bottom of the hollow volume, the valve body integrally defining an inlet and an outlet of the hollow volume, one of the inlet and the outlet being defined at front wall and the other one of the inlet and the outlet being defined at the back wall, an open/close member, mounted displaceable in the valve body, the open/close member having a peripheral profile including two opposite side portions and a lowermost portion, an anti-freezing arrangement, wherein the valve body is a cast valve body that also integrally defines, in an intermediate position between the front and the back walls, a valve seat in which the open/close member is displaceable between a raised position and a lowered position, for enabling or preventing passage of the liquid from the inlet to the outlet, respectively, wherein the valve seat is integrally formed in the valve body in a spaced-apart position with respect to the inner sides of the front and back walls, the valve seat being at least partly defined at the inner side of the side wall, wherein a lowermost portion of the valve seat is defined at the inner side of the lower portion of the side wall, in such a way that the lowermost portion of the valve seat is engageable by the lowermost portion of the peripheral profile of the open/close member when the open/close member is in said lowered position, wherein the anti-freezing arrangement comprises an axially extended hollow member embedded in the metal material constituting the valve body, for passage of a heating fluid, the hollow member having respective inlet and outlet ends accessible from outside the valve body and designed for connection to a circuit of the heating fluid, wherein a lower stretch of the hollow member intermediate to the inlet and outlet ends thereof is embedded in the metal material forming the lower portion of the side wall, the lower stretch of the hollow member extending in length in a position comprised between the lowermost portion of the valve seat and the outer side of the lower portion of the side wall. |
