Badger Meter CV Series User Manual
FLOW METERING EQUIPMENT
Installation and In struc tion
Man u al
Venturi Flow Meters
Models: SSL, SSM, LPL, VISSL VISSM, VILPL, CV, VBR
I. Introduction
Preso Venturi ow meters are di erential pressure ow devices providing highly accurate and
repeatable measurements of liquids, gases, and steam. The Venturi restricts the ow at its throat and
measures the pressure di erence of the unrestricted ow and restricted ow. The Venturi's throat
can be designed to meet the ow mearurement application optimizing the Venturi's accuracy and
permanent pressure loss.
The Preso Venturi's design provides longer lasting accuracy and lower permanent pressure loss
than ori ce type meters, reducing maintenance and operating costs. The Preso Venturi can be built
to meet the highest pressure and temperature speci cations often limited in other ow meter
technologies. All models can also be supplied with RTDs and transmitters to provide an economical
mass ow measurement solution.
II. Speci cations
Applications: Liquids, gases and steam
SSL - Classical (Herschel) Design / VISSL - Insert Version
Pipe Sizes: ½ to 60 inches and larger (13 to 1524 mm)
Pressure & Temperature: Varies, dependent upon materials of construction
Pressure Loss: 6% of DP maximum
Turndown Ratio: 10:1
Process Connections: SSL; NPT, anged, butt weld, socket weld, grooved
VISSL; Insert ts between pair of anges
Instrument Connections: NPT, socket weld, anged
Accuracy: ±1% of reading uncalibrated; ±0.5% of reading calibrated
Standard Beta Ratios: 0.35, 0.49, 0.63 and 0.75;
exact sizing available to provide custom beta ratios
SSM - Hydraulic Shape Design (Nozzle Type) / VISSM - Insert Version
Pipe Sizes ½ to 60 inches and larger (13 to 1524 mm)
Pressure & Temperature: Varies, dependent upon materials of construction
Pressure Loss: 6% of DP maximum
Turndown Ratio: 10:1
Process Connections: SSM; NPT, anged, butt weld, socket weld, grooved
VISSM; Insert ts between pair of anges
Instrument Connections: NPT, socket weld, anged
Accuracy: ±1% of reading uncalibrated; ±0.5% of reading calibrated
Standard Beta Ratios: 0.35, 0.49, 0.63 and 0.75;
exact sizing available to provide custom beta ratios
Page 2 Form #4-20-23 11/10
Speci cations (continued)
LPL - Low-Loss Design (Short Form) / VILPL - Insert Version
Pipe Sizes: ½ to 60 inches and larger (13 to 1524 mm)
Pressure & Temperature: Varies, dependent upon materials of construction
Pressure Loss: 3% of DP maximum
Turndown Ratio: 10:1
Process Connections: LPL; NPT, anged, butt weld, socket weld, grooved
VILPL; Insert ts between pair of anges
Instrument Connections: NPT, socket weld
Accuracy: ±3-5% of reading uncalibrated; ±0.5% of reading calibrated
Standard Beta Ratios: -10, -20, -38, -65;
exact sizing available to provide custom beta ratios
CV Series
Pipe Sizes: 2 to 16 inches and larger (51 to 406 mm)
Pressure: 300 PSIG (2070 kPa) maximum
Temperature: 250 °F (120 °C) maximum
Process Connections: NPT, butt weld, anged, grooved
Instrument Connections: NPT
Standard Beta Ratios: -38, -65
VBR Series
Pipe Sizes: ½ to 2 inches (13 to 51 mm)
Pressure: 400 PSIG (2756 kPa) maximum
Temperature: 250 °F (120 °C) maximum
Process Connections: FNPT, socket/sweat
Instrument Connections: NPT
Standard Beta Ratios: -10, -20, -38, -65
Form #4-20-23 11/10 Page 3
III. Installation
Straight Pipe Run Requirements - SSL, SSM, LPL, VISSL, VISSM, VILPL
As with most ow elements, proper operation and performance is dependent on the required
lengths of unrestricted upstream and downstream piping. The recommended minimum length
of the upstream side of the Venturi ow element depends on the type of tting at the start of the
straight run and the pipe con guration. A fully developed symmetrical ow pro le is achieved with
the minimum upstream and downstream lengths as shown in Figure 1.
INSTALLATION DISTURBANCE
A
Single elbow
Two elbows in the same plane
Two elbows in dierent planes
≤ 2D
Reducer
≥ 0.5D
Expander
Tee connection with dierent diameters
Venturi
A
A
1.5 to 3D
A
1D to 2D
A
d or D
AB
A
B
MODEL
SSL / VISSL – Classical
SSM / VISSM – Nozzle
LPL / VILPL – Low-Loss
B
B
B
B
B
D
A
B
A
B
A
B
A
B
A
B
A
B
A
THROAT SIZE
–1
–2
–3
–4
–10
–20
–38
–65
Minimum Recommended Pipe Diameters
–1
–10
4
222 2
8
333 3
15
4
6
2
8
3
8
3
6
–2
–20
4
8
15 15
4
2
3
33
6
BETA RATIO
0.35
0.49
0.63
0.75
0.35
0.49
0.62
0.81
–3
–38
45
9
4
66
2
88
33
88
6
–4
–65
10
20
10
10
4
7
2
3
3
Globe / Gate valve fully opened
A
Globe / Gate valve partially opened
B
B
A
B
3
12
3333
3
12
14
3
3
18
FIGURE 1
Venturi Pipe Diameter Recommendations
SSL, SSM, LPL, VISSL, VISSM and VILPL Models
NOTES:
1. For upstream and downstream lengths equal to one half the values shown, add 2 percent to the accuracy
value.
2. Any ow conditioner shall be installed in the straight length between the primary element and the
upstream distance, or the tting closest to the element. The straight lengths between tting and
conditioner shall be at least 5D and the length between conditioner and Venturi meter shall be at least 8D.
3. For other ttings, con gurations, consult Preso.
4. Reference - ISO-5167, "Flow Measurement Engineering Handbook", R.W. Miller.
Page 4 Form #4-20-23 11/10
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