Patent ID: 6499503
Filing Date: 2002-12-31
Classification: E03F,F16K,Y10T

Abstract:
A backflow valve, comprising:a valve body; a flow passage extending through the valve body, the flow passage having a longitudinal axis; a closure gate having a first end and a second end, the closure gate being pivotally mounted in the flow passage of the valve body for movement between an open position in which the closure gate is substantially centrally positioned within the flow passage on a plane substantially parallel to and immediately above the longitudinal axis of the flow passage and a closed position in which the closure gate is positioned transverse to the longitudinal axis, the closure gate having a midsection positioned pivot axis positioned between the first end and the second end, the closure gate being unbalanced with greater weight being toward the first end; a rotational stop being secured to the valve body to limit pivotal movement when the closure gate is in the open position; a float being secured to the first end of the closure gate, the greater weight at the first end biasing the closure gate by force of gravity against the rotational stop and into the open position, the float causing the closure gate to pivotally move in response to a rise in liquid in the flow passage, with a reversal of flow pushing the closure gate to the closed position.