While ball valves themselves don't have a distinct front and back, the direction of fluid flow is crucial during installation. The fluid flow direction must be consistent with the valve's flow direction. If the fluid flow is opposite, the valve's internal sealing components will face greater pressure, potentially leading to leakage or damage.
Therefore, when installing a ball valve, first determine the fluid flow direction, then identify the valve's inlet and outlet according to the markings, and finally install the ball valve correctly according to the flow direction. If there are no markings on the ball valve, the flow direction can be determined by observing the fluid arrow or flow direction markings on the valve body.