3
Installation Instructions
Installation
A. Series 4000CIV should be installed in a horizontal and
upright position. This positions the relief valve below the first
check valve, enabling the zone to drain through the relief
valve outlet. The shutoff valve with the test cock is to be
mounted on the inlet side of the backflow preventer. The
test cock is on the inlet side of the shutoff valve.
B. The Series 4000CIV should always be installed in an acces-
sible location to facilitate testing and servicing. Check the
state and local codes to ensure that the backflow preventer
is installed in compliance, such as the proper height above
the ground.
C. Water discharge from the relief valve should be vented in
accordance with code requirements. The relief valve should
never be solidly piped into a drainage ditch, sewer or sump.
The discharge should be funneled through an air gap fitting
piped to a floor drain.
D. A strainer should be installed ahead of the assembly to
protect the discs from unnecessary fouling.
E. Backflow preventers should never be placed in pits unless
absolutely necessary and then only when and as approved
by local codes. Consult your local or state plumbing or
health inspector.
Start Up
F.
The downstream shutoff should be closed. Open upstream
slowly, fill the valve and bleed the air through Test cock 2, 3
and 4. When valve is filled, open the downstream shutoff
slowly and fill the water supply system. This is necessary to
avoid water hammer or shock damage.
G. The installation of an air gap with the drain line terminating
above a floor drain will handle any normal discharge or nui-
sance spitting through the relief valve. However, floor drain
size may need to be designed to prevent water damage
caused by a catastrophic failure condition. Do not reduce
the size of the drain line from the air gap fitting.
H. Two or more smaller size valves can be piped in parallel
(when approved) to serve a larger supply pipe main. This
type of installation is employed where increased capacity is
needed beyond that provided by a single valve and permits
testing or servicing of an individual valve without shutting
down the complete line.
The number of assemblies used in parallel should be deter-
mined by the engineer's judgement based on the operating
conditions of a specific installation.
Table One — Capacity Required for System
50 gpm
100 gpm
150 gpm
200 gpm
250 gpm
350 gpm
450 gpm
640 gpm
1000 gpm
2000 gpm
3000 gpm
4000 gpm
Two
3
/
4
"
Two 1"
Two 1
1
/
4
"
Two 1
1
/
2
"
Two 1
1
/
2
"
Two 2"
Two 2
1
/
2
"
Two 3"
Two 4"
Two 6"
Two 8"
Two 10"
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Devices
Table shows total capacity provided with dual valve installations of various sizes.
Indoors
Above Ground
Parallel
Main
Meter
Strainer
12"
Air
Gap
Support
Series 4000
2
1
/
2
" – 10"
(65 – 250mm)
Min. 12"
Series 4000
2
1
/
2
" – 10"
(65 – 250mm)
Strainer
Air
Gap
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