Patent ID: 7370665

Claim:
A tank for holding a liquid, said tank having a removable outlet valve which is accessible externally of the tank, the valve including a valve body which incorporates an inverted cone shaped valve seat, a cavity extending upwardly away from the valve seat, an outlet in communication with the valve seat, a ball element engageable on the valve seat, and an inlet communicating with the cavity whereby liquid in the tank can flow into the cavity, the ball element being of a construction such that, in use, it floats in said liquid away from the valve seat until the quantity of liquid in the valve is insufficient to prevent the ball element from engaging the valve seat, wherein an upper part of the cavity has an apertured cage about which extends a mesh filter and wherein the cage is formed by a plurality of pillars which project from the valve body and to which a cover is removably attached, said mesh filter being located in position between the cover and the valve body.