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ManualsBrandsMacon Balancing ManualsBalancing Valves1-1/2" NPT STV Balancing Valve

Valve Selection Guide

Valve Size

Nominal Dimensions

Inches

1/2

3/4

1 1/4

1 1/2

2 1/2

DN 15

DN 20

DN 25

DN 32

DN 40

DN 50

DN 65

DN 80

DN 100

DN 125

DN 150

DN 200

DN 250

DN 300

0.14 / .52

.26 / .98

.37 / 1.38

.60 / 2.28

.91 / 3.46

1.52 / 5.76

2.13 / 8.07

4.19 / 15.9

6.09 / 23

7.61 / 28.8

13.7 / 51.9

30.3 / 114

76.3 / 289

0.5 - 3.8 / 1.89 - 14.36

3.8 - 5.5 / 14.36 - 20.8

5.5 - 9.5 / 20.8 - 36

9.5 - 14 / 36 - 53

14 - 20 / 53 - 76

20 - 33 / 76 - 125

33 - 100 / 125 - 378

100 - 117 / 378 - 442

117 - 200 / 442 - 756

200 - 320 / 756 - 1210

320 - 440 / 1210 - 1663

440 - 650 / 1663 - 2460

650 - 1300 / 2460 - 4915

1300 - 1600 / 4915 - 6050

Minimum Flow

GPM/LPM

Maximum Flow

GPM/LPM

12.1 / 45.7

17.4 / 65.7

30 / 113.4

44.6 / 169

66.4 / 251

107.2 / 406

318.3 / 1205

374.5 / 1418

646.8 / 2448

1025 / 3879

1447 / 5477

2100 / 7940

4050 / 15300

4750 / 17590

Nominal Range of Flow

GPM/LPM

Balancing Valves should be selected according to GPM flows, not line sizes.

The Minimum Flow is cal-

culated from the minimum

recommended pressure

drop 1 ft. WG (=3.0 kPa)

The Nominal Flow is from

the maximum setting of the

valve and the minimum

recommended pressure

drop, 2 ft WG (=6.0 kPa)

The Max Flow is calculated

from the maximum setting

of the valve and the max

pressure drop, 20 ft WG

(=60.0 kPa)

The pressure drop tables

on Pages 8, 9, & 10 can

also be used for correct

valve selection

Installation Recommendations

Install the valve in the correct flow

direction according to the arrowon

the valve body and the distance

parameters detailed in Figure 1

(Note: D= pipe diameter).

For Series STVL, cover the valve body

with a wet cloth when soldering to

prevent premature deterioration of

valve components.

When used with a pump, it is recom-

mended to use a straight length of pipe totaling 10 x D (instead of 5

x D) upstream or downstream to avoid turbulence that will affect the

measuring accuracy. See Figure 2.

Turbulence can influence the measurements by up to 20% if this

recommendation is not followed.

Figure 1

Figure 2

BALANCING

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