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
guidelines will help preserve your valve 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
