Submittal Sheet

Differential Pressure Table
- Model MB
Optional features and accessories available for this
Macon product are an extra charge, and not included
in the standard model price.
www.maconbalancing.com
Tunstall Corporation
118 Exchange Street · Chicopee, MA 01013
Phone (413) 594-8695 · Fax (413) 598-8109
Section: Components Bulletin-MB-MB-0915a
Model MB Venturi Type Balancing Valve 0.50” - 2.00”
Differential Pressure: Inches W.C.
Flow
GPM
MB1A-
Flow
GPM
MB3A-
050-L
075-L
050-H
075-H
075-L
100-L
075-H
100-H
3A
125
3B
150
3A
125
3B
150
4A
200
0.10 1
18.00
62 36 14
0.20 2
19.00
69 41 15
0.30 5
20.00
76 45 17
0.42
10
1
21.00
84 50 19
0.50
14
1.5 1
22.00
92 54 21
0.75
31
3 2
23.00
101 60 23
1.00
55
6 4
24.00 110
65 25
1.25
86
9 6
25.00 119
70 27
1.35
101 11
7 1
26.00 129
76 29
1.50 124
13 9
1.4
27.00 139
82 31
2.00 221
23 16
2.5
28.00 149
88 34
2.25
29 21
3 29.00 160
95 36
2.50
36 25
4 1.2 30.00 171
101 39
3.00
52 36
6 1.7 31.00 183 108
41
3.50
71 50
8 2.3 1.4 32.00 195 115
44
4.00
92 65 10
3 1.8 33.00 207 122
47
4.50
117
82 13
4 2.3 34.00 220 130
50
5.00
144
101 15
5 3 35.00 233 138
53
5.50
175 123
19
6 3.4 36.00 146
56
6.00
208 146
22
7 4 37.00 154
59
6.50
244 171
26
8 5 39.00 171
65
7.25
213
33 10
6 40.00 180
69
7.50
228
35 11
6.4 41.00 189
72
8.00
40 12
7 42.00 198
76
8.50
45 14
8 43.00 208
79
9.00
50 15
9 44.00 218
83
9.50
56 17 10
45.00 228
87
10.00
62 19 11
48.50
101
10.50
68 21 12
55.00 130
11.00
75 23 14
60.00 154
11.50
82 25 15
65.00 181
12.00
89 27 16
70.00 210
12.50
97 30 18
75.00 241
13.00
105
32 19
14.00
121
37 22
15.00
139
43 25
16.00
159
49 29
17.00
179
55 33
FF
0.1346 0.4163 0.4967 1.2704 2.2921 2.9816
2.2921 2.9816 4.8274
Flow Formulas
GPM = FF x (DP)
DP = (GPM/FF)
2
PPL = DP x 0.12
Notes:
1) Accuracy ± 3% of flow rate. 2) Repeatability ± 0.25% of rate.
3) Values in BOLD type represents traditional 10” to 100” sizing range.
4) All valves will function above and below ranges shown. Pressure drop
and readability should be taken into account.
MB1B- MB2A- MB2B- MB3A- MB3B- MB3B- MB4A-
MANUAL