The so-called Kaplan turbines are reaction-type turbines that are axially streamed by water, featuring adjustable rotor blades, which are mainly used for energy conversion in run-of-river power stations. Top-quality RINGFEDER® locking assemblies, specifically designed for the respective application, are used for this type of turbine to effectively and reliably connect the shaft of the impeller blade to the hydraulic adjustment mechanism. Reliable overload safety devices are an essential part of the design specification for applications of this type: When a specific torque is reached, the RINGFEDER® locking device slips through on the shaft and in this way protects the impeller from costly damage involving complex repair work.
So-called Turgo turbines are impulse turbines, i.e. the water pressure is not subjected to a change while the water passes through the turbine blades. They are mainly suitable for applications with a small to medium delivery head and are characterised by a high functional efficiency with lower costs compared to Kaplan turbines. In practice, torsionally flexible jaw couplings of the RINGFEDER® TNM series have proven to be an especially suitable coupling solution for the connection of the turbine and generator shaft: Their capacity for effectively compensating misalignments, excellent damping properties, their huge compactness and optimum investment and operating costs are only some of the advantages to be named which users from the sector of hydropower benefit from.