The Hydrotrol (HT) flow control valve is used to prevent overheating of zones due to gravity flow in hydronic heating systems, and will permit summer-winter operation of an indirect water heater. The HT valve allows fluid to pass when the system or zone pumps start. When the system or zone pumps are not operating, the HT valve remains closed, preventing gravity circulation. The HT valve has an elastomer seal providing positive check. The HT valves feature a 1/2 turn knob that manually opens the valve for system draining or valve bypass. The HT valve can be installed in either the horizontal or vertical orientation.