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 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 valves are designed
with a 1/2 turn knob that can be manually opened
when draining the system or for bypass purposes.
The HT valve can be installed in either the horizontal
or vertical orientation.