AWWA C560:2000 pdf download.Cast-lron Slide Gates
4.4.5.2 Design. Guides shall be designed for the design head indicated with a safety factor of 5 for shear, compressive, and tensile strength. The guides shall be of such length as to support at least one-half the vertical height of the slide when the slide is in the open position. Provisions shall be made to prevent lateral movement of bolted- on guides. They shall be capable of taking the entire thrust produced by water pressure and wedging action with a safety factor of 5. Wedges or wedge facings shall be attached securely to the guides at points where, in the closed position, they will make full contact with the wedging surfaces on the slide. The guides of self-contained gates shall be provided with pads for mounting the yoke. The pads shall be machined to a plane perpendicular to the movement of the gate slide.
4.4.6 Yoke. Self-contained gates shall be provided with a cast-iron or structural-steel yoke designed to withstand the thrust of the floorstand or hoist when a 40-1b (178-N) effort is placed on the handwheel or crank with a safety factor of 5 based on the ultimate strength of the material used. The top of the yoke shall be machined to receive the operating mechanism. The pads on the yoke that contact those on the top of the guides shall be machined on contact faces and bolted to the guides.
4.4.8 Wedging devices. All slide gates shall be equipped with adjustable side-wedging devices to provide contact between the slide and frame facings when the gate is in the closed position. All faces shall be machined accurately to give maximum contact and wedging action. Wedges shall be fully adjustable and designed so that they will remain in the fixed position after adjustment. On all conventional closure gates wider than 24 in. (600 mm) that will be subjected to unseating heads, top and bottom wedging devices shall be provided. Flush-bottom closure gates wider than 24 in. (600 mm) that will be subjected to unseating heads shall be provided with top wedges.AWWA C560 pdf download.