Segmental radial sealing rings are mostly used for shaft sealing on water turbines (Francis of Kaplan), steam turbines, compressors and fans. Each ring consists of certain number of segments surrounded by spring. Number of segments depend on shaft diameter. During the application medium pressure is equally distributed on outer ring diameter, thus the purpose of spring is to hold segments together until sufficient pressure of medium is achieved. Number of rings depends on working pressure. Very similar shape but different in application are piston rod seals and piston guide rings. They also consist of several segments, but moving of piston rod or piston is axial. Most common applications include steam turbines, water turbines, compressors, fans etc.