H2flow FlowVis FV-C User manual

FlowVis®
FlowVis®
Flow Meter
English
Rev.4.5
Operating Manual
2.5” / DN50/65, 3” / DN80 and
4” / DN100 models
FlowVis® retrofit model
DESCRIPTION
FlowVis® is a revolutionary, patented solution for accurate and
reliable flow rate measurement in fresh water applications
such as swimming pools, spas, fountains, water features, and
solar systems.
Using a design that is based on ‘mass flow’ principles, the
FlowVis® provides many benefits that include:
• Ease of installation without the need to have 15x of
straight pipe
• Installation flexibility that allows orientation in any
position, e.g., horizontal, vertical or even upside-down
• Long life without sticking floats or paddle wheels
• Combined Flow Meter and Check Valve in all models
except FV-C-S, FV-C-Saline, FV-3, FV-L-DN80, FV-4 and
FV-L-DN100.
CONCEPT
As flow increases, the check valve or safety flapper moves
forward toward its fully open position. The flapper’s angular
position is directly related to flow rate through the valve body
/ Tee. A calibrated scale on the valve’s lid provides a highly
accurate reading of the flow rate.
Calibrated Scale
Flow
www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
IMPORTANT NOTE: For the most up-to-date version of this manual, please visit www.h2flow.net/product-literature

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
General Information
RESOURCES
Thank you for purchasing the H2flow FlowVis® flow
meter. If you would like to find additional product
resources, including tech tip sheets, brochures,
videos, and materials in other languages, please
visit our website at www.h2flow.net or scan the QR
Code below.
SERVICE REPAIR KIT
A service repair kit is available using the Part
Number FV-SK. The kit comprises:
• 1 x o-ring
• 1 x spring
• 1 x flapper and indicator arm (for all
models except FV-C-S, FV-C-Saline, FV-3,
FV-L-DN80, FV-4 and FV-L-DN100)
• 1 x pivot pin
For all other parts, please contact H2flow at
888-635-0296 (toll-free) or ([phone]
(International).
TABLE OF CONTENTS
Description .........................................................front cover
Concept...............................................................front cover
General Info
Resources............................................................................. 2
Service Repair Kit............................................................... 2
Models & Compatibility
Models................................................................................... 3
Compatibility........................................................................ 4
NSF 50................................................................................... 4
Chlorine Feeders ............................................................... 4
Safety Information
Warnings & Safety.............................................................. 5
Dimensions & Valve Body Feature
Valve Body Feature........................................................... 5
Dimensions........................................................................... 6
Installation
Installation............................................................................. 8
Lid Assembly & Operation
Tightening Lid Screws...................................................... 9
Flow Range .......................................................................... 9
Head Loss Data .................................................................10
Operation.............................................................................12
Operation & Maintenance
Maintenance .......................................................................13
Technical Data
Materials Used ...................................................................14
Operational Data...............................................................14
2
Warranty
Warranty ...............................................................................15
Warranty
Notes................................................................... back cover
Contact Info....................................................... back cover

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
Models & Compatibility
MODELS
FlowVis® comprises several models; it is important that you check that the model you are about to install is the
correct one for your application.
TABLE 1
3
ENGLISH DIMENSIONED MODELS
MODEL PIPE SIZE PIPE SCHED. SCALE DESCRIPTION
FV-C 2” or 2.5” 40 GPM Complete FlowVis® including valve body
FV-C-15 1.5” 40 GPM Complete FlowVis® including valve body
FV-C-L 2” or 2.5” 40 LPM Complete FlowVis® including valve body
FV-C-15-L 1.5” 40 LPM Complete FlowVis® including valve body
FV-C-S 2” or 2.5” 40 GPM FlowVis® including valve body, no check valve
FV-C-S-L 2” or 2.5” 40 LPM FlowVis® including valve body, no check valve
FV-3 3” 80 GPM Complete FlowVis® including Tee
FV-3-L 3” 80 LPM Complete FlowVis® including Tee
FV-4 4” 80 GPM Complete FlowVis® including Tee
FV-4-L 4” 80 LPM Complete FlowVis® including Tee
FV-C-Saline 2” 40 GPM FlowVis® for flotation tanks, no check valve
TABLE 2
METRIC DIMENSIONED MODELS
MODEL PIPE SIZE PIPE SCHED. SCALE DESCRIPTION
FV-C-L-DN50/65 DN50/65 40 LPM Complete FlowVis® including valve body
FV-C-L-DN40 DN40 40 LPM Complete FlowVis® including valve body
FV-L-DN80 DN80 80 LPM Complete FlowVis® including valve body
FV-L-DN100 DN100 80 LPM Complete FlowVis® including valve body
TABLE 3
RETROFIT MODELS (ENGLISH DIMENSIONED)
MODEL PIPE SIZE PIPE SCHED. SCALE DESCRIPTION
FV-J-R 2” or 2.5” 40 GPM Retrofit for existing Jandy® check valve body
FV-J-R-15 1.5” 40 GPM Retrofit for existing Jandy® check valve body
FV-P-R 2” or 2.5” 40 GPM Retrofit for existing Praher® check valve body
FV-P-R-15 1.5” 40 GPM Retrofit for existing Praher® check valve body
FV-H-R 2” or 2.5” 40 GPM Retrofit for existing Hayward® check valve body
FV-H-R-15 1.5” 40 GPM Retrofit for existing Hayward® check valve body

NOTE: The above graphic only relates to applications that use erosion style chemical feeders. In all other circumstances, the FlowVis® can
be installed in any of the locations shown.
www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
Models & Compatibility cont.
CHLORINE FEEDERS
IMPORTANT DISCLAIMER
Installation locations
Corrosion Resistant Check Valve
Filter Heater
Chlorinator
1
2
3
4
5
1 = Best
2 = Very Good
3 = OK, but not ideal
4 = Bad
5 = Really bad
4
Material selections such as Viton and Hastelloy c-276 ensure that FlowVis® will provide many years of trouble-free
operation in normally treated, sanitized pool water conditions. However, certain brands and designs of inexpensive
chlorine feeders are known to fail and release high concentrations of chlorine or even chlorine gas into the
surrounding filtration system. When this occurs, any equipment that comes into contact with these abnormal levels
of chemicals, will experience rapid and catastrophic damage. Inspection of any failed components will quickly and
conclusively confirm the cause of the damage, and under these circumstances, the product’s warranty will be void.
Under no circumstances should FlowVis® be used as a ‘check valve’ to prevent the eects of these Chlorine Feeders
damaging other equipment such as Heaters.
COMPATIBILITY
When using the ‘retrofit’ models listed in Table 3 on
page 3, it is important to note that each manufacturer’s
valve body design has a unique hydraulic
characteristic that will result in a specific FlowVis®
calibration scale being required. It is therefore
important that you select the correct FlowVis® model
for the particular valve body that is installed in your
system.
NSF 50
Models certified to NSF 50 will display the mark as
shown below:

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
Check Valves should always be installed in accordance with the original manufacturer’s instructions. When purchased
as a complete Check Valve & Flow Meter combination, a copy of these instructions will be included with the FlowVis®
packaging. If a FlowVis® retrofit kit has been purchased, it is the installer’s responsibility to ensure that the Check
Valve has been installed correctly and does not violate any local or federal codes relating to Check Valves.
The Virginia Graeme Baker Pool & Spa Act requires that all public swimming pools
& spas having a single main drain or multiple drains that are 3 feet or less (center
to center) from each other, be fitted with a backup anti-
entrapment system. Such systems include, but are not limited
to, SVRS and Automatic Pump Shut O systems. Special
consideration must be made when installing a FlowVis® to such
applications. Several of these systems do not allow the use
of Check Valves. It is the responsibility of the installer to make
sure that the requirements of the specific backup system in
use are maintained.
For these applications, see model FV-C-S in Table 1 on Page 3.
WARNINGS & SAFETY
Warnings & Safety
5
VGBA
On the side of the valve body that is used for the 1.5”, 2”/2.5”, DN40 and DN50/65 models, you will note the
following feature:
VALVE BODY FEATURE
This has no functionality relating to the operation of the FlowVis® and is
simply provided as a feature to be able to plumb in a drain down pipe and
valve. A typical use for this might be a roof mounted solar system. Under
no circumstances should this hole be drilled out when using the valve body
with the FlowVis®.

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
6
Dimensions
DIMENSIONS
B
C
A
F
D
D
E
DIMENSION VALUE
A 6.5”
B 5.875”
C Schedule 40 - 1.5”
D 1.375”
E 4.63”
F 3.75”
WEIGHT 1.5 lbs
Models: FV-C-15 / FV-C-15-L
DIMENSION VALUE
A 6.5”
B 5.875”
C Schedule 40 - 2” (Slip) & 2.5” (with coupling)
D 1.375”
E 4.63”
F 3.75”
WEIGHT 1.5 lbs
Models: FV-C / FV-C-L / FV-C-S /
FV-C-S-L / FV-C-Saline
ENGLISH/STANDARDENGLISH/STANDARD
DIMENSION VALUE
A 165.1 mm
B 149.23 mm
C Schedule 40 - DN40
D 34.93 mm
E 117.6 mm
F 92.25 mm
WEIGHT 0.544 kg
Models: FV-C-L-DN40
METRIC
DIMENSION VALUE
A 165.1 mm
B 149.23 mm
C Schedule 40 - DN50 (Slip) / 65 (with coupling)
D 34.93 mm
E 117.6 mm
F 92.25 mm
WEIGHT 0.544 kg
Models: FV-C-L-DN50/65
METRIC

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
7
Dimensions
B
C
E
A
D
F
A
D
F
B
C
E
DIMENSION VALUE
A 8.0”
B 9.5”
C Schedule 80 - 3”
D 1.875”
E 4.5”
F 4.25”
WEIGHT 3 lbs
Models: FV-3 / FV-3-L
ENGLISH/STANDARD
DIMENSION VALUE
A 203.2 mm
B 241.3 mm
C Schedule 80 - DN80
D 47.63 mm
E 114.3 mm
F 107.96 mm
WEIGHT 1.36 kg
Models: FV-L-DN80
METRIC
DIMENSION VALUE
A 9.5”
B 9.75”
C Schedule 80 - 4”
D 2.25”
E 5.25”
F 5.0”
WEIGHT 5 lbs
Models: FV-4 / FV-4-L
ENGLISH/STANDARD
DIMENSION VALUE
A 241.3 mm
B 247.65 mm
C Schedule 80 - DN100
D 57.15 mm
E 133.26 mm
F 127.0 mm
WEIGHT 2.27 kg
Models: FV-L-DN100
METRIC

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
INSTALLATION
IMPORTANT NOTE: Before installing the FlowVis®, please refer to the preceding section on Page 4 regarding
chlorine feeders.
Installation of FlowVis® should be in accordance with the following instructions.
Normal plumbing procedures such as cleaning, priming and gluing of fixtures should be followed in order to avoid
leaks. If you are not familiar with plumbing procedures, it is recommended that you employ the skills of a qualified
plumber.
Unlike other flow meters, FlowVis® is not aected by flow stream disturbances caused by its proximity to pumps,
elbows, tees, valves, etc. FlowVis® does not require specific straight pipe lengths before or after its point of
installation, and can be installed close to, or even adjacent to other plumbing fittings. FlowVis® can be installed
either horizontally or vertically.
NOTE: When selecting a physical location to install FlowVis®, be sure to allow accessibility to read the scale on the lid.
Pay particular attention to the system’s direction of flow and make sure that the arrow on the lid of the FlowVis® is
pointing in the correct direction. For the 3” / DN80 and 4” / DN100 versions, the Tee will have an additional arrow
on one of its bosses. In the event that the FlowVis® is inadvertently glued into the plumbing in the wrong direction,
simply remove the (8) screws holding the lid in place and rotate the entire lid assembly by 180˚.
NOTE: Always remove the FlowVis® lid assembly prior to gluing in the valve body.
8
Installation
Flow Range:

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
TIGHTENING LID SCREWS
When installing the Retrofit versions of FlowVis® or when removing and re-installing the FlowVis® lid assembly, it is
important to adhere to the following procedure:
1. Make sure that the o-ring on the underside of the lid is undamaged, lubricated with silicone (such as Boss 820)
and is in-place without twists.
2. Ensure flapper hinge pin is centered.
3. Carefully lower the lid onto its valve body (or Tee in the case of the 3”
/ DN80 and 4” / DN100 models), making sure that the o-ring stays in
place.
4. Insert by hand the (8) stainless steel screws but do not tighten at this
stage.
5. Using a hand Phillips-head screwdriver, slowly tighten the screws in
a diagonal pattern, per the sequence to the right. Do not fully tighten
one screw before proceeding to the next, i.e., pull them down slowly
multiple times to avoid stressing and cracking the lid. Screws should be
tightened to a final torque of 25 inch / pounds or 34 Nm.
FLOW RANGE
9
1
2
3
5
4
6
7
8
Lid Assembly & Operation
FlowVis® Models Pipe Size Min Flow -
GPM U.S.
Min Flow -
LPM
Max Flow -
GPM U.S.
Max Flow -
LPM
FV-C-15, FV-C-15-L, FV-J-R-15, FV-P-R-15, FV-
H-R-15, FV-C-L-DN40
1.5” /
DN40 10 40 90 360
FV-C, FV-C-L, FV-J-R, FV-P-R, FV-H-R,
FV-C-L-DN50/65
2” / 2.5” /
DN50/65 10 / 20 40 / 80 110 400
FV-C-S, FV-C-S-L 2” / 2.5” /
DN50/65 30 N/A 110 N/A
FV-3, FV-3-L, FV-L-DN80 3” / DN80 90 N/A 220 833
FV-4, FV-4-L, FV-L-DN100 4” / DN100 160 N/A 300 1136
FV-C-Saline 2” 20 80 100 400
Flow Range:

www.h2flow.net •Tel: [phone] (Toll Free) OR ([phone] (International)
10
Head Loss Data
HEAD LOSS DATA
Head Loss (FV-C):
Head Loss (FV-C-S):
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
20 30 40 50 60 70 80 90 100 110 120
Head Loss Ft.
FlowRate GPM
FlowVis Head Loss (ft H
2
O) -2" Schedule 40 Pipe
0.0
1.0
2.0
3.0
4.0
5.0
6.0
20 30 40 50 60 70 80 90 100 110 120
Head Loss Ft.
FlowRate GPM
Head Loss (ft H
2
O) -2.5" Schedule 40 Pipe
0.0
0.5
1.0
1.5
2.0
2.5
20 30 40 50 60 70 80 90 100 110 120
Head Loss psi
FlowRate GPM
FlowVis Head Loss (psi) -2" Pipe
0.0
0.5
1.0
1.5
2.0
2.5
20 30 40 50 60 70 80 90 100 110 120
Head Loss psi
FlowRate GPM
Head Loss (psi) -2.5" Pipe
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
30 40 50 60 70 80 90 100 110
Head Loss Ft.
FlowRate GPM
FlowVis Head Loss (ft H
2
O) -2" Schedule 40 Pipe
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
30 40 50 60 70 80 90 100 110
Head Loss psi
FlowRate GPM
FlowVis Head Loss (psi) -2" Schedule 40 Pipe
NOTE: One 90�elbow equals 5.7 feet NOTE: One 90�elbow equals 6.9 feet