Patent ID: 8662119

Claim:
A leak prevention system for use with a liquid dispensing nozzle, the nozzle in fluid communication with a liquid dispensing pump, the system comprising: a body portion; a spout assembly extending from the body portion, the spout assembly having an outlet end configured for dispensing the liquid; a flow control valve in the body portion operable to allow or prevent the flow of liquid through a flow passage defined by the body portion; a hinge pin fixedly attached to an inner wall of the outlet end of the spout assembly; a shaft fixedly attached to the inner wall of the outlet end of the spout assembly upstream of the hinge pin; and a check valve comprising: a flap member pivotably attached within the spout assembly; and a closing member mounted within the spout assembly and oriented to engage the flap member to apply a closing force to a seating surface of the flap member inside the spout assembly; the check valve positioned within the spout assembly and downstream of the flow control valve and being responsive to the flow of liquid through the body portion and into the spout assembly; and wherein the check valve is biasedly disposed to remain closed when no liquid is flowing through the nozzle so as to retard liquid from dripping from the outlet end of the spout assembly when the nozzle is not activated, and wherein one end of the closing member is attached to the shaft and an opposing end of the closing member is attached to the seating surface of the flap member such that the closing member is in constant communication with at least a portion of the seating surface of the flap member.