Weil McLain 640-000-088 3 Way Zone Valve

The Weil McLain 640-000-088 3-Way Zone Valve is a flow-control component used to redirect heated water in various piping lines of a hydronic heating HVAC systems. It operates using an internal valve design that moves water between outlets, allowing the boiler and hydronic system to control the distribution of heated water during operation. It is installed in the piping of the system where the inlet and outlet lines are aligned with the heating loop. It enables precise temperature control even heat distribution, and stable system operation.