Difference between revisions of "Roller Gates"

[[Category:Valves]]{{Knoppen}}

[[File:Roller gates1.jpg|thumb|right|Roller Gates]]

'''Roller Gates''' are designed to control flow through large waterway openings where economy and ease of operation are important. They may be designed as either upward or downward opening.  A roller or fixed wheel gate consists of a fabricated steel slide with cast iron rollers and rubber seals. The gate leaf is a box-like design of welded construction. It varies in width and height as required by the size of the opening in the concrete and varies in thickness depending on the depth of water. Recesses at the sides of the gate opening are provided with rails and with contact faces for side seals.  The thrust developed from water pressure against the gate is transmitted through the rollers to the rails and into the structure. The lift capacity required to open the gate under maximum operating conditions is minimized as the thrust caused by the water pressure is transferred to rolling friction .