Other

Daniel T McDonell

Michael D Lattner

An improved overfill shut-off system for a liquid storage tank includes a passage having an inlet end and an outlet end, a valve seat in the passage, a plunger that is movable within the passage for the purpose of engaging the valve seat to impede flow of liquid in the passage, and a guide member for guiding movement of the plunger. The plunger and the guide member are sealed with respect to each other and together define a control space. A first port is defined in the plunger for communicating the control space with an upstream end of the passage, and a second port is defined in the guide member for communicating the control space with a downstream end of the passage. A valve is provided for selectively impeding fluid flow through the second port in response to the level of a float member within the storage tank. When liquid level in the storage tank reaches a predetermined maximum, liquid flowing through the passage will be permitted through the first port, but not through the second port. This creates a hydraulic effect that will expand the control space and extend the plunger to engage the valve seat, thereby preventing overfill of the storage tank.

Growing community of inventors

Dubuque, IA, United States of America

Daniel T McDonell