Red Valve WATERFLEX SERIES WF-3 Installation and operating instructions

The revolutionary design of the Series WF-3 InLine
Check Valve provides reliable backflow prevention.
The valve solely operates on differential pressure
and has no moving mechanical parts. The valve
exhibits low headloss, high backpressure ratings and
a short face-to-face dimension.
The valve is only intended for clean flow media or
media with only fine particulates.
The Series WF-3 is constructed withANSI, DIN, BS
or special flange drillings for easy installation.
IMPORTANT
Please take a moment to review this manual. Before performing any maintenance on the
valve be sure the pipeline has been de-pressurized. The improper installation or use of this
productmayresultin personalinjury, productfailure, orreduced productlife. Red ValveCo., Inc.
can accept NO liability resulting from the improper use or installation of this product. If you have
any questions or problems, please call the customer service department at [phone]. We
appreciate your comments. And thank you for choosing Red Valve.
WATERFLEX SERIES WF-3
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
™

Flow
Flow
2
1. PIPE AND INSPECTION OF VALVE:
Check flange faces of pipe for rough/damaged
areas. Pipeline flanges must be flat, properly spaced,
and parallel to achieve proper seal. PVC flanges may
not seal properly, and are not recommended by Red
Valve. If PVC flanges are used, metal back up rings
should be placed behind the PVC flanges in order to
prevent yielding. Grind or file any sharp edges of pipe
flanges to prevent damage to the gaskets.
2. GASKETS:
Two flange gaskets by others are required, one on
each side of the disc. (See Figure 2.)
3. INSTALLING FLANGE BOLTS:
Tighten all bolts uniformly to distribute pressure
evenly around the sleeve flange. (For bolting se-
quence refer to the back page of this IOM).
4. VALVE ORIENTATION:
The membrane must be on the downstream side of
the disc when properly installed in a pipe line.
(See Figure 2.)
Make sure membrane is concentric with pipe I.D.
When installed in a horizontal pipeline, the rod must
be in the vertical position. (See Figure 3.)
GENERAL DESCRIPTION
Terms used in this I.O.M. to refer to various parts of the
valve are described below. (See Figure 1.)
1. Disc
2. Membrane
3. Mounting Rod
4. Rod Fasteners with Lock Nuts
5. Lifting Eye (sizes 10" and up)
INSTALLATION
It is acceptable to install the valve in a vertical pipeline
provided normal flow direction is bottom to top.
(See Figure 4.)
It is not recommended to install the valve in a vertical
pipeline where the flow direction is from top to bot-
tom. The membrane may tend to come away from the
disc and may not seal with minimal backpressure.
(See Figure 4.)
1
2
3
5
4
(Figure 1)
(Figure 2)
Flow
WF3 Disc
Pipe Flange
Pipe Flange
Gaskets
Membrane
Mounting Rod
Mounting Rod
Membrane
(Figure 3)
(Figure 4)

3
MAINTENANCE
1. INSPECTION:
Valves should occasionally be inspected for damage
and wear. The inspection period should be determined
by the severity of the service and environment. If valves
are periodically inspected and preventive maintenance
done, the valve will last longer and operate better.
CAUTION: Do not remove the bolting or valve parts
with pressure in the line. Relieve pressure on both
sides of the valve prior to servicing.
ELASTOMER MEMBRANE REPLACEMENT:
1. A spare replacement membrane should be placed on
order when this valve is placed in service.
2. Remove the existing valve and install the replacement
membrane by removing the rod fasteners and mount-
ing rod. Place the new membrane on the disc while
aligning mounting holes in membrane with holes in the
disc. The membrane must be placed on the disc with
the label facing you. Improper operation may result if
the membrane is installed with the label facing the disc.
Re-install rod, bolts and torque lock nuts just enough
for compression of rod to membrane to disc. Do not
over torque lock nuts as it may cause edge of mem-
brane to lift off disc.
The Series WF-3 operates soley on differential
pressure. Positive differential opens the valve allow-
ing flow, reverse differential closes the valve prevent-
ing backflow.
The Series WF-3 Check Valve is a self containing
Check Valve with backpressure ratings shown in the
table on this page. Backpressures in excess of these
ratings can damage the disc or membrane.
Red Valve check valves are custom made products
intended for a specific application and have been
designed to respond to criteria unique to that pur-
pose, such as line pressure, minimum and maximum
backflow pressure, and chemical compatibility. Should
the conditions for which the valve has been designed
be altered or change in any way, it could affect the
normal operation of the valve.
OPERATION
If your Waterflex™ Valve is to be stored for a period
of time prior to installation, the following storage
guidelineswill help preserve yourvalve and assure a
trouble free installation.
1. Store valve in a clean, cool, dry location. Avoid
exposure to light, electric motors, dirt or chemicals.
2. Store valve to prevent other items from contacting
membrane or flanges to prevent possible damage.
3. Lay Waterflex™ flat with membrane up.
4. Store this manual with the valve, so that it is readily
available at time of installation.
STORAGE
Backpressure Ratings Table
Consult factory for larger sizes and higher working pressure.
Nominal ANSI BACK PRESSURE
PIPE FLANGE OUTSIDE ANSI RATING
SIZE SIZE DIAMETER psi
4 " 4" 9" 150
6
" 6" 11" 150
8
" 8" 13.5" 125
10
" 10" 16" 100
12
" 12" 19" 75
14
" 14" 21" 75
16
" 16" 23.5" 75
18
" 18" 25" 75
20
" 20" 27.5" 75
24
" 24" 32" 50
30
" 30" 38.75" 50
36
" 36" 46" 50
42
" 42" 53" 50
48
" 48" 59.50" 50

TROUBLESHOOTING
Symptom: Leaking Flange
• Check gaskets
• Retighten all flange bolts uniformly in star pattern
(See figure to right)
Symptom: Valve Allows Backflow
• Not enough pressure
• Membrane damaged
• Objects plugging perforations in disc
• Membrane installed backwards
Symptom: Valve won't open or too much headloss
• Check pipe I.D. and membrane O.D. to verify membrane
was not clamped between disc and mating flange.
• Possible collection of solids or debris on disc.
RED VALVE WARRANTY
WARRANTIES - REMEDIES - DISCLAIMERS - LIMITATION OF LIABILITY
Unless otherwise agreed to in writing signed by Red Valve, all Products supplied by Red Valve will be described in the specifica-
tions set forth on the face hereof.
THE WARRANTIES SET FORTH IN THIS PROVISIONARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES
WHETHER STATUTORY, EXPRESS OR IMPLIED (INCLUDING ALL WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE AND ALL WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OR TRADE).
Red Valve Products are guaranteed for a period of one year from date of shipment, against defective workmanship and material
only, when properly installed, operated and serviced in accordance with Red Valve’s recommendations. Replacement for items of
Red Valve’s manufacture will be made free of charge if proved to be defective within such year; but not claim for transportation,
labor or consequential damages shall be allowed. We shall have the option of requiring the return of the defective product to our
factory, with transportation charges prepaid, to establish the claim and our liability shall be limited to the repair or replacement of
the defective product, F.O.B. our factory. Red Valve will not assume costs incurred to remove or install defective products nor
shall we incur backcharges or liquidated damages as a result of warranty work. Red Valve does not guarantee resistance to
corrosion erosion, abrasion or other sources of failure, nor does Red Valve guarantee a minimum length of service, or that the
product shall be fit for any particular service. Failure of purchaser to give prompt written notice of any alleged defect under this
guarantee forthwith upon its discovery, or use, and possession thereof after an attempt has been made and completed to remedy
defects therein, or failure to return product or part for replacement as herein provided, or failure to install and operate said
products and parts according to instructions furnished by Red Valve, or failure to pay entire contract price when due, shall be a
waiver by purchaser of all rights under these representations. All orders accepted shall be deemed accepted subject to this
warranty which shall be exclusive of any other or previous warranty, and shall be the only effective guarantee or warranty binding
on Red Valve, anything on the contrary contained in purchaser’s order, or represented by any agent or employee of Red Valve in
writing or otherwise, not withstanding implied warranties. RED VALVE MAKES NO WARRANTY THAT THE PRODUCTS,
AUXILIARIES AND PARTSARE MERCHANTABLE OR FIT FOR ANY PARTICULAR PURPOSE.
700 N. Bell Avenue
Carnegie, PA 15106
phone: [phone]
fax: [phone]
email: [email protected]
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BOLTING SEQUENCE
(Star Pattern)