ABSTRACT
This chapter shows three of the most common types of high-head gates: the cylinder, the Tainter, and the leaf gate. Factors involved in making the selection of a gate or valve for an outlet work have been presented by Kohler. The internal-type cylinder gate is located inside an intake tower and consists of a cylindrical skinplate with an axisymmetric supporting structure. The radial or Tainter gate offers advantages of relatively small hydrodynamic hoisting forces, as does the cylinder gate, as long as the supporting pin is located in the geometric center of the cylindrical skin plate. The most widely used high-head gates for flow regulation or emergency closure of large outlets or conduits are leaf gates because of the many advantages they offer in construction and maintenance. A high-head leaf gate with downstream skinplate and seals is used for emergency closure of the bottom outlet in an arch dam.
