This article provides a comprehensive guide to the fundamental operating principle of check valves, which are essential for allowing fluid flow in only one direction and preventing costly backflow. It details the mechanics of common valve types, with a special focus on the advantages of the compact and efficient Dual Plate Wafer Check Valve. The guide further outlines key factors for selecting the right valve and highlights the expertise of Tianjin Worlds Valve Co., Ltd. As a specialist manufacturer with international certifications (CE, UKCA, ACS, WRAS), Worlds Valve offers reliable, customizable solutions and expert support for a global clientele across diverse industries.