Capacity Tables for NT Series

STEAM
BTU/hour

P.D.* with
10 PSI Inlet
3.5 Cv
1-1/4″ Valves
2.74 Cv
1″ Valves
2.5 Cv
3.4″ Valves
1.8 Cv
1/2″ Valves
1 psi 48,000 39,000 36,000 28,000
3 psi 87,000 70,000 65,000 46,000
5 psi 113,000 91,000 84,000 63,000
7 psi 130,000 104,000 96,000 72,000
10 psi 162,000 130,000 120,000 90,000

*P.D. = Pressure Drop
Capacity measured with 10 psi inlet preasure.
EDR = Equivalent Direct Radiation (in ft.2)
EDR = (BTU/hr) / 240
BTU/hr = 240 x EDR
BTU/hour – lbs. steam/hour x 1000

HOT WATER
BTU/hour**

**Pressure Drop
Ft.
P.D.
PSI
3.5 Cv
1-1/4″ Valves
2.74 Cv
1″ Valves
2.5 Cv
3/4″ Valves
1.8 Cv
1/2″ Valves
1 .43 21,000 17,000 16,500 12,000
2 .87 28,000 23,000 22,000 15,500
4 1.7 44,000 35,000 32,500 23,500
6 2.6 53,000 43,000 40,000 29,000
8 3.5 64,000 51,000 47,000 33,500
10 4.3 70,000 56,000 52,000 37,500
12 5.2 77,000 62,000 57,000 41,000
14 6.1 83,000 67,000 62,000 44,500
16 7.0 88,000 71,000 66,000 47,500

EDR (Equivalent Direct Radiation in ft.2) for hot water

Water Temperature Cast Iron Radiator Convector
200°F 209 205
190°F 187 183

BTU/hour = EDR in ft.2 x (Appropriate number from above EDR Table)
For example 205 for 200°F water in convector.

**Assumes 20°F drop in water temperature through radiation.
GPM = CvvP.D.
BTU/hour = GPM x 10,000
1Ft. H2O = .433 psi

BULLETIN: NTCT-1705 – Capacity Tables for “NT” Series Valves