초록 ▼

An automatic culvert directional flow control device comprising a flange or support ring supporting a hinge assembly. A pair of dampers are joined to the hinge in a pivoting and a vertical relationship, one over the other. The dampers are held in a normally closed position by means such as a counter

An automatic culvert directional flow control device comprising a flange or support ring supporting a hinge assembly. A pair of dampers are joined to the hinge in a pivoting and a vertical relationship, one over the other. The dampers are held in a normally closed position by means such as a counter balance. The culvert directional flow control device is designed for easy installation on the inside of existing culverts and acts to prevent water from reversing direction of flow through the culvert against the desired normal flow.

대표청구항 ▼

An automatic culvert directional flow control device designed to prevent the back flow of water in a culvert comprising: a generally arcuate supporting member sized to tightly fit at least a portion of an inside diameter of a culvert, the culvert having an inside surface, and sized to fit inside a g

An automatic culvert directional flow control device designed to prevent the back flow of water in a culvert comprising: a generally arcuate supporting member sized to tightly fit at least a portion of an inside diameter of a culvert, the culvert having an inside surface, and sized to fit inside a groove on the inside surface of the culvert; hinge means attached horizontally across the arc of said supporting means; normally closed upper and lower semicircularly shaped dampers pivotally attached to said hinge means and being in a vertical relationship one over the other when normally closed; a counter balance attached to the upper damper, whereby a first predetermined pressure of water bearing against the lower damper will open that damper allowing water to pass through, and where gravity closes said lower damper when the water pressure falls below said first predetermined pressure, and where a second higher predetermined pressure of water bearing against both dampers will open both dampers, said second damper being opened against the weight of the counter balance means to allow additional water to pass through, where said counter balance means close said upper damper when the water pressure falls below said second predetermined pressure.