Types of check valves. A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check valves, the ball is spring-loaded to help keep it shut.
(October 2016) Learning is the act of acquiring new, or modifying and reinforcing existing, knowledge, behaviors, skills, values, or preferences which may lead to a potential change in synthesizing information, depth of the knowledge, attitude or behavior relative to the type and range of experience.
Learner's definition of REPETITION. 1. [noncount] : the act of saying or doing something again : the act of repeating something. Sometimes repetition is necessary to drive a point home. Find a synonym for âniceâ in order to avoid repetition. [=using the same word again] Children's songs involve lots of repetition.