Brochure

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-MC-NTCT-0714
Valves
CAPACITY TABLES for
”NT” SERIES VALVES
P.D.* with
10 PSI Inlet
3.5 C
v
1-1/4” Valves
2.74 C
v
1” Valves
2.5 C
v
3/4” Valves
1.8 C
v
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
STEAM
BTU/hour
*P.D. = Pressure Drop
Capacity measured with 10 psi inlet pressure.
EDR = Equivalent Direct Radiation (in ft.
2
)
EDR = BTU/hr = 240 x EDR
BTU/hour = lbs. steam/hour x 1000
240
BTU/hr
HOT WATER
BTU/hour**
** Pressure Drop
Ft.
P.D.
PSI
3.5 C
v
1-1/4” Valves
2.74 C
v
1” Valves
2.5 C
v
3/4” Valves
1.8 C
v
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
** Assumes 20°F drop in water temperature through radiation.
GPM = C
v
1psi = 2.31 Ft. H
2
O
BTU/hour = GPM x 10,000 1Ft. H
2
O = .433 psi
..DP
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