The ball is rotated to align the hole with the flow of fluid. Ball valves are typically used for smaller diameter pipes and cannot handle as high of pressures as gate valves. Valve Flow Direction. For a system with a unidirectional flow, a gate valve is the best choice. Gate valves are also well suited for applications where a large volume of. Flow-ball by POWERbreathe is a respiratory exercising device, designed to encourage a focused and steady breath which is particularly useful to those in Performing Arts where breath control is fundamental. By targeting and challenging the breathing muscles using the Flowball you can increase the control and the stability of your exhaled airflow. Balls, Clubs, torches & Juggling props for Jugglers FlowJuggle www.flowjuggle.com Henry's, Play, K8, Kosmos Malabares Brick and Mortar Juggling store @ Floasis. 38779.