Honeywell Valve Assembly, 1″ Sweat, 3 Way, Modulating/ Floating/ PWM Fail Safe Actuation, 60 Psi Maximum Differential Pressure Rating ( Closeoff ), Selectable 60 or 120 Second Timing, Stem Up to Close A Port, 8.3 Cv, Chilled or Hot Water with up to 60% Glycol