A heating zone valve is a device used to control the flow of hot water or steam to a specific area of a building. This type of valve is typically used in hydronic heating systems, which use hot water or steam to heat a space. Heating zone valves are usually installed in a series of valves that control the flow of hot water or steam to each individual zone. By controlling the flow of hot water or steam to each zone, the user can ensure that the desired temperature is achieved in each area. The valves are typically operated by a thermostat, which allows the user to set the desired temperature for each zone. Heating zone valves are an important part of any hydronic heating system, as they help to ensure that the desired temperature is achieved in each area.