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http://www.armtec.com/en-ca/products-and-services/drainage-solutions-and-water-treatment/water-control-products/cast-iron-slide-gates.aspx Cast iron slide gates are used to control the flow of fluid through openings for seating or unseating head. With seating or face pressure, fluid exerts a force on the front of the gate. The pressure of the water forces the gate slide against the frame. In the design of a structure where cast iron slide gates are used, place the gate so that it will be subjected to a higher seating head whenever possible. When this is done, a lighter gate can be used, and is usually more watertight. Unseating or back pressure is encountered when the depth of fluid is greater on the back side of the gate. Under these conditions, the fluid force pushes the slide away from the frame and the total force must be resisted by the wedging devices and assembly bolts of the gate
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