Bleeder valves or modulating valves, bleed off near freezing water from exposed piping and allow the system to refill with warmer re-supply water. The bleeder valve will close when the temperature of the water or fluid is above the set-point and the danger of freezing is over.
Drain valves are typically positive action valves that open or release at a set temperature. The valve does not close until the system is completely drained and the valve can be manually closed or reset.
Refer to our HAT/FP valves for additional information on bleeder valves and our GURU DL2.1 for information on our drain type valves.