IMPORTANT NOTE: For the most up-to-date version of this manual, please visit www.h2fl ow.net/product-literature
DESCRIPTION
FlowVis® is a revolutionary, patented solution for accurate and
reliable fl ow 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 fl ow’ principles, the
FlowVis® provides many benefi ts that include:
English
Rev.4.5
2.5” / DN50/65, 3” / DN80 and
4” / DN100 models
FlowVis® retrofi t model
• Ease of installation without the need to have 15x of
straight pipe
• Installation fl exibility that allows orientation in any
position, e.g., horizontal, vertical or even upside-down
• Long life without sticking fl oats 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 fl ow increases, the check valve or safety fl apper moves
forward toward its fully open position. The fl apper’s angular
position is directly related to fl ow rate through the valve body
/ Tee. A calibrated scale on the valve’s lid provides a highly
accurate reading of the fl ow rate.
Notes ................................................................... back cover
Contact Info ....................................................... back cover
RESOURCES
Thank you for purchasing the H2fl ow FlowVis® fl ow
meter. If you would like to fi nd additional product
resources, including tech tip sheets, brochures,
videos, and materials in other languages, please
visit our website at www.h2fl ow.net or scan the QR
Code below.
Dimensions & Valve Body Feature
Valve Body Feature ........................................................... 5
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.
ENGLISH DIMENSIONED MODELS
MODELPIPE SIZEPIPE SCHED.SCALEDESCRIPTION
FV-C2” or 2.5”40GPMComplete FlowVis® including valve body
FV-C-151.5”40GPMComplete FlowVis® including valve body
FV-C-L2” or 2.5”40LPMComplete FlowVis® including valve body
FV-C-15-L1.5”40LPMComplete FlowVis® including valve body
FV-C-S2” or 2.5”40GPMFlowVis® including valve body, no check valve
FV-C-S-L2” or 2.5”40LPMFlowVis® including valve body, no check valve
FV-33”80GPMComplete FlowVis® including Tee
FV-3-L3”80LPMComplete FlowVis® including Tee
FV-44”80GPMComplete FlowVis® including Tee
FV-4-L4”80LPMComplete FlowVis® including Tee
FV-C-Saline2”40GPMFlowVis® for flotation tanks, no check valve
TABLE 1
METRIC DIMENSIONED MODELS
MODELPIPE SIZEPIPE SCHED.SCALEDESCRIPTION
FV-C-L-DN50/65DN50/6540LPMComplete FlowVis® including valve body
FV-C-L-DN40DN4040LPMComplete FlowVis® including valve body
FV-L-DN80DN8080LPMComplete FlowVis® including valve body
FV-L-DN100DN10080LPMComplete FlowVis® including valve body
RETROFIT MODELS (ENGLISH DIMENSIONED)
MODELPIPE SIZEPIPE SCHED.SCALEDESCRIPTION
FV-J-R2” or 2.5”40GPMRetrofit for existing Jandy® check valve body
FV-J-R-151.5”40GPMRetrofit for existing Jandy® check valve body
FV-P-R2” or 2.5”40GPMRetrofit for existing Praher® check valve body
FV-P-R-151.5”40GPMRetrofit for existing Praher® check valve body
FV-H-R2” or 2.5”40GPMRetrofit for existing Hayward® check valve body
FV-H-R-151.5”40GPMRetrofit for existing Hayward® check valve body
TABLE 2
TABLE 3
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3
Models & Compatibility cont.
COMPATIBILITY
When using the ‘retrofit’ models listed in Table 3 on
page 3, it is important to note that each manufacturer’s
NSF 50
Models certified to NSF 50 will display the mark as
shown below:
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.
CHLORINE FEEDERS
IMPORTANT DISCLAIMER
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 eects of these Chlorine Feeders
damaging other equipment such as Heaters.
Installation locations
Corrosion Resistant Check Valve
2
3
FilterHeater
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.
1
5
Chlorinator
1 = Best
2 = Very Good
3 = OK, but not ideal
4 = Bad
5 = Really bad
4
4
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Warnings & Safety
WARNINGS & SAFETY
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® retrofi t 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 fi tted with a backup antientrapment system. Such systems include, but are not limited
to, SVRS and Automatic Pump Shut O systems. Special
VGBA
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 specifi c backup system in
use are maintained.
For these applications, see model FV-C-S in Table 1 on Page 3.
VALVE BODY FEATURE
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:
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®.
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 aected 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.
Flow Range:
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.
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8
Lid Assembly & Operation
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.
FlowVis FV-3 Head Loss (psi) - 3" Schedule 80 Pipe
Flow Rate GPM
Flow Rate GPM
NOTE: One 90� elbow equals 7.9 feet
Head Loss (FV-4):
NOTE: One 90� elbow equals 11.4 feet
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11
Operation & Maintenance
OPERATION
The FlowVis® is factory-calibrated to be extremely accurate across its full operating range. Any
perceived ‘inaccuracy’ is related to the viewing angle at which the scale is being read. To avoid
so-called ‘parallax error’, it is important to position your eye so that you are looking squarely at the
tip of the indicator arm. To achieve this, simply move your head so that you just lose sight of the
vertical leading edge of the red arm.
NOTE: Slowly move your head
in this direction to the point
where the leading edge of the
indicating arm is not visible.
(1)
(2)
(3)
(1) Indicator arm is
being viewed too far
forward / near the rear
of the lid.
Vertical leading edge
(2) Indicator arm is
being viewed correctly.
(3) Indicator arm is
being viewed too far
back / front of the lid.
AccuracyFV-3, FV-4, FV-L-DN80 and FV-L-DN100Average: 98.6% in straight pipe
Min / Max operating ambient tempAll models32˚F (0˚C) / 140˚F (60˚C)
Periodic calibrationAll modelsNone required
Design lifeAll modelsGreater than 5 years
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14
Warranty
WARRANTY
IMPORTANT, please read and keep this document on record.
1. Definition
H2flow Controls, Inc., warrants the FlowVis® product for 3-years from its date of supply from H2flow Controls, Inc. or its stocking
Distributor. In the event that the product experiences a premature failure due to defective workmanship or materials, H2flow will, at its
discretion, replace either the failed component(s) or the complete FlowVis unit. H2flow shall not be responsible for third-party labor or any
consequential losses. Damage caused by improper installation, misuse or exposure to excessive chemicals such as chlorine, will not be
covered by this warranty.
2. Eligibility
This warranty extends to the original purchaser only or to the end-user client of an H2flow Controls Inc authorized aliate.
3. How to obtain service
To obtain service under the terms of this warranty, the customer is required to notify H2flow Controls Inc. before the expiration of the
warranty period and to return the item in accordance with H2flow Controls Inc’s product return policy. Any product returned for warranty
repair must be accompanied by a full fault report specifying the symptoms and the conditions under which the fault occurs. Should H2flow
Controls Inc incur additional cost as a result of a failure to complete the appropriate paperwork, an administrative charge may be levied.
4. Exclusions
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate care. H2flow Controls
Inc. shall not be obligated to provide service under this warranty if:
a) damage has been caused by a failure to make a full and proper inspection of the product (as described by the documentation enclosed
with the product at the time of shipment) on initial receipt of the product following shipment;
b) damage has been caused by the attempts of individuals, other than H2flow Controls Inc sta to repair or service the product;
c) damage has been caused by the improper use of the product, including but not limited to, the installation of a FlowVis® unit using a
chlorination system as described on page 4 of this manual.
5. Charges
Under cover of this warranty, H2flow Controls Inc will pay the carriage and insurance charges for the
shipment of defective product back to H2flow Controls Inc and for its return to the client’s original site
of dispatch except when:
a) H2flow Controls Inc’s product return policy has not been followed.
b) product failure is caused by any of the exclusions described at paragraph 4 above, when the customer will be liable for the full cost of
the repair (parts and labor) plus all carriage and insurance costs to and from H2flow Controls Inc’s premises.
c) the product is damaged in transit and a contributory cause is inadequate packaging. It is the customer’s responsibility to ensure that
the packaging used to return equipment to H2flow Controls Inc is the same, or has equivalent protective qualities, to that used to ship the
product to the customer in the first instance. Any damage resulting from the use of inadequate packaging will nullify H2flow Controls Inc’s
obligations under this warranty.
Should the customer’s product be damaged in transit following a repair at H2flow Controls Inc’s site, a
full photographic record of the damage must be obtained (packaging and the product) to support any claim for recompense. Failure to
present this evidence may limit H2flow Controls Inc’s obligations under this warranty.
THIS WARRANTY IS GIVEN BY H2FLOW CONTROLS INC IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, NON INFRINGEMENT OR
FITNESS FOR A PARTICULAR PURPOSE. H2FLOW CONTROLS INC SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES. WE SPECIFICALLY DISCLAIM ANY AND ALL WARRANTIES TO
CUSTOMERS OF THE CUSTOMER. THE CUSTOMER’S SOLE REMEDY FOR ANY BREACH OF WARRANTY IS THE REPAIR OR
REPLACEMENT, AT H2FLOW CONTROLS INC’S DISCRETION, OF THE FAILED PRODUCT.
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