초록 ▼

An overflow and isolation valve is disclosed. The overflow and isolation valve includes a valve body having a chamber defined therein, and an integral leg member formed as part of the valve body having a proximal end on the valve body and a distal end extending away therefrom. A bore is defined with

An overflow and isolation valve is disclosed. The overflow and isolation valve includes a valve body having a chamber defined therein, and an integral leg member formed as part of the valve body having a proximal end on the valve body and a distal end extending away therefrom. A bore is defined within the leg member extending from the distal end to the proximal end thereof, and is in generally fluid-tight communication with the chamber formed within the valve body. An integral float assembly is provided as a part of the valve for sealing the distal end of the leg member in response to the liquid level within the tank. A threaded annular ring is formed within the bore of the leg member intermediate the proximal and distal ends thereof, and faces inwardly of the bore for receiving a threaded plug thereon, the threaded plug being passed through a vapor recovery system riser opening defined in the valve body in substantial registry with the bore of the leg member so that the plug forms a fluid-tight and pressure-tight seal between the leg member and the chamber within the valve body without having to first remove the float assembly.

대표청구항 ▼

An overflow and isolation valve for use with the vapor recovery system of an underground liquid storage tank, the overflow valve being mounted on the storage tank and being in fluid-tight communication with the vapor recovery system, the storage tank having a liquid level therein, said valve compris

An overflow and isolation valve for use with the vapor recovery system of an underground liquid storage tank, the overflow valve being mounted on the storage tank and being in fluid-tight communication with the vapor recovery system, the storage tank having a liquid level therein, said valve comprising: a) a valve body having a chamber defined therein; b) said valve body including an elongate leg member, said leg member having a proximal end sealed on said valve body and a distal end extending away from said valve body; c) a continuous bore defined within said leg member and extending along a longitudinal axis from the distal end to the proximal end of the leg member, said bore being in fluid-tight communication with said chamber at the proximal end of the leg member; d) an integral float assembly supported on the distal end of said leg member, said float assembly being constructed and arranged for movement from an open position into a generally fluid-tight closed position on the distal end of said leg member in response to an increase in the level of the liquid held within the tank for preventing the passage of liquid through said leg member and into said chamber; and e) a threaded annular ring positioned within said leg member and extending inwardly of said bore toward said axis, said annular ring being positioned intermediate the proximal end and the distal end of said leg member.