Fluid control or regulation is not an easy task to perform when it is about dealing with the industries that of liquid or gaseous substances because in these settings the dealt fluid is in a great bulk when talking about the magnitude of mass while the surface action and pressure remains other two distinctive dimensions that must be managed in order to perform fluid regulation in industrial structures.

The conduct of flow controlling and its regulation in fluid industries is done via different valves that perform their similar role that is to regulate the flow with distinctive manners as per the demand or requirement of the respective system. In the context of the pressure points, the check valves are effective in regulating the fluid flow in the situations when the upstream fluid pressure changes its values in comparison to the downstream pressure levels.

Hence, typically the check valves are in their closed positions when the fluid is not flowing through them, and in the situation, when it does flow through them, the valves come in an open position. However, as mentioned before, their functionality also depends on the change of up and downstream pressures they get shut when the downstream pressure surpasses the upstream pressure. 

The check valves are quite efficient in stopping or avoiding the backflow in the flow systems because it is a unidirectional valve that works in one dimension only, and the installation of these valves is done carefully in accordance with the normal direction of the fluid. Correspondingly, as the valve regulates the liquid flow in one direction only, it also has an arrow on it, which is made to indicate the flow. The check valve manufacturers offer these unidirectional fluid flow controlling devices in two different domains where they perform their basic tasks in different manners, the respective valve types incorporate lift and swing check valve.