In the automotive industry, three-way valves are key components used in cooling, braking, and air conditioning systems. In the cooling system, the three-way valve regulates the flow of antifreeze, guiding some liquid into the auxiliary coolant tank to buffer pressure at high temperatures and assisting the system in drawing liquid back into the auxiliary tank to maintain circulation at low temperatures. The coolant level is also visually monitored using the auxiliary tank's markings. In the braking system, the three-way valve connects the automatic branch pipe, auxiliary air cylinder, and brake cylinder, precisely controlling the compressed air path to achieve braking and releasing functions. In the air conditioning system, the three-way valve is used at rectangular straight-through three-way pipes or gusseted pipes. By adjusting its structure, it changes the airflow and pressure of the branch pipe, ensuring proper airflow distribution for the air conditioning system. Its sealing relies on O-ring seals, and aging issues must be considered.
In laboratory exhaust systems, 90-degree right-angle tees may lead to energy loss, control vibration, and safety hazards, with a local resistance coefficient (ζ) typically between 1.0 and 2.5. In contrast, 45-degree wye tees in the direction of airflow have a local resistance coefficient of only 0.2 to 0.35. Authoritative domestic and international standards recommend 30° to 45° angled insertion. When space is limited, "shoe-tap" connectors can be used to provide cushioning. During installation, branch pipes should be connected from above the top or side horizontal centerline of the main pipe, and connection from the bottom is strictly prohibited.
