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Backwater Valve Pre-Installation Guidelines
Drainage & Slope - The minimum downstream slope is 1/4" per
foot or 2%. DO NOT install vertically. Valve body must be installed
lower than the fl ood rim of lowest fi xture.
(Do not scale drawing - for reference only)
Valve Location & Access Whenever possible, locate valve body/
access plug in an exposed, open area to facilitate servicing.
Valve Orientation -
Spears
Backwater Valves must be installed horizontally, with
®
access plug UP and arrow (
desired flow direction.
Periodic inspection is recommended to ensure that no effl uent
or debris has obstructed fl ap movement and proper operation.
Worn or damaged Flap Assembly can be easily replaced using
snap-in replacement unit.
Precautions for All Valve Installations
• Inspect all parts for damage before proceeding.
•
• • Clean and dry ALL joining components.
• • Remove ALL system components from their packaging
and expose to the environment for at least one hour.
• • Do NOT install if temperature is above 110° F (43° C)
or below 40° F (5° C).
• • When installed, Valve must be well supported and
relieved of ALL mechanical stress loads.
• • BEFORE Valve is cycled, all foreign material must be
flushed from the system to prevent damage
Backwater Valve Installation
Prepare Connecting Pipe - Cut pipe ends square;
STEP 1
deburr and bevel as shown below. Proper cutting tools are
recommended.
Orient Valve: Access Plug up + proper fl ow direction.
STEP 2
Solvent Cement Valve End to Pipe – Be sure to prevent
STEP 3
solvent cement contact with the internal body or fl ap assembly. This could
prevent proper operation and sealing. Repeat connection on opposite end.
) on valve side pointing in the
.
3
CAUTION: Valve must be installed horizontally with
proper direction of fl ow. Do not install upside down.
Install the fl ap assembly and verify free operation and
STEP 5
seating of fl ap. Be sure the locking tab is fully engaged. Install
Access Cap and hand-tighten. Do not over torque. Valve is now
ready for service.
CAUTION – Do Not allow solvent cement to come in contact with the
internal body or fl ap assembly. This could prevent proper operation
and sealing.
Standard Valve Dimensions
H
F
I
E
A
B
C
G
VALVE DIMENSIONS
Size
A
B
C
2"
1-13/16 1-3/4 2-5/8
3"
2-5/8
2
4-3/16 13/32
4"
3-5/8
3-3/4 5-7/16 23/32
6"
4-3/4
4-5/8 7-3/4
TEE
HANDLE
Pre-Made
LOCK
Extension Kit
COLLAR
D
Nominal Height
measured
TEE
HANDLE
Plug-to-Plug
COUPLING
TEE
HANDLE
EXTENSION
STANDARD
BWV VALVE
Table 1
FLOW
E
F
G
H
5/16
3-1/4
5-9/32
4-3/16 4-9/16
4-1/8
7-3/4
6
5-7/16 10-15/16 8-1/4
13/16
7-3/16 15-3/8
11-1/4 10-13/16
4
PLUG
THREADED
ADAPTER
RISER
PIPE
COUPLING
I
6-1/8
7-15/16
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