In a hydraulic system, what prevents fluid from flowing backwards?

Check valves prevent fluid from flowing backwards in a hydraulic system. A check valve is a one-way valve that allows fluid to flow in only one direction. It typically consists of a ball, poppet, or disc that is spring-loaded or pressure-activated. When fluid pressure is applied in the correct direction, the valve opens, allowing fluid to flow through. However, if the fluid attempts to flow in the reverse direction, the valve automatically closes, preventing any backflow. Check valves are strategically placed throughout the hydraulic system to ensure that fluid flows in the intended direction and to prevent pressure from bleeding off or causing unwanted movement of actuators. This helps to maintain the proper operation of hydraulic components and prevent damage to the system.