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You are required to thoroughly read all installation instructions and product safety information
before beginning the installation of this product. FAILURE TO COMPLY WITH PROPER
INSTALLATION AND MAINTENANCE INSTRUCTIONS COULD RESULT IN PRODUCT
FAILURE WHICH CAN CAUSE PROPERTY DAMAGE, PERSONAL INJURY AND/OR
DEATH. FEBCO is not responsible for damages resulting from improper installation and/or
maintenance.
Local building or plumbing codes may require modifications to the information provided.
You are required to consult the local building and plumbing codes prior to installation. If this
information is not consistent with local building or plumbing codes, the local codes should be
followed.
Need for Periodic Inspection/Maintenance: This product must be tested periodically in
compliance with local codes, but at least once per year or more as service conditions war-
rant. Corrosive water conditions, and/or unauthorized adjustments or repair could render the
product ineffective for the service intended. Regular checking and cleaning of the product's
internal components helps assure maximum life and proper product function.
Installation Instructions
1. Consult local codes for specific installation
requirements and restrictions applicable to
your area. It is recommended that system
supply pressure be at least 20psi (138 kPa).
2. These instructions apply to Series
870V/876V, and LF870V/876VST sizes 2
to 10" (65-250mm) only. The valves may
be installed only in the orientation/flow
direction as shown. All 870V/876V and
LF870/876VST assemblies are shipped in
the horizontal installation orientation only.
The gate valves may be rotated as permit-
ted by the flange bolt pattern.
3. The valve assembly must be installed
where it is accessible for periodic testing
and maintenance. Clearances shown in
the installation views apply to exterior,
interior and pit/vault installations and are
only recommendations. These minimums
do not apply to removable protective
enclosures. Refer to local codes for actual
requirements in your area.
4. PRIOR TO INSTALLING THE VALVE INTO
THE LINE, FLUSH THE SUPPLY LINE
OF ALL FOREIGN MATERIAL. Failure to
flush the supply line may cause the check
valves to become fouled and require dis-
assembly and cleaning.
5. Lift the assembly by connecting lift
hooks to the lift rings cast into the valve
body. DO NOT LIFT THE ASSEMBLY
BY CONNECTING TO THE GATE VALVE
HANDWHEELS OR STEMS. The use of
the optional valve setters (horizontal units
only) provides for a rigid connection to
ENGLISH INSTRUCTIONS
⁄
"
1
2
the supply line (with the correct center-
line) without the need for concrete thrust
blocks.
6. For vertical installation, loosen bolts on
the groove coupling just enough to allow
rotation of the outlet check. Rotate outlet
check 180º. Ensure that the vertical sup-
port adapter is in place (valve is shipped
with adapter banded in place) and install
pipe support (pipe support to be furnished
by the customer and shall fit same size
pipe as the valve being installed, except
2
⁄
" (65mm) valves will use a 3" pipe sup-
1
2
port).
NOTE: THE VALVE BODY AND PIPE SUPPORT
ARE INTENDED TO SUPPORT THE WEIGHT
OF THE SECOND CHECK VALVE AND OUTLET
GATE VALVE ONLY. THE PIPING ABOVE THE
OUTLET GATE VALVE MUST BE SUPPORTED
INDEPENDENTLY. Retighten bolts of groove
coupling. Rotate outlet gate valve as desired
– required.
6a. For vertical installation of the DCDA, first
remove formed tube from bypass piping,
then follow instructions outlined in No. 6
above. When this has been completed,
rotate the compression fitting elbow 180º
and reinstall the tube, rotating the pipe
tee now at the bottom of the outlet check
to align with tube.
7 . After installation SLOWLY fill the assembly
with water and bleed air from the body
using the # 3 and # 4 test cocks. Test the
valve assembly to ensure correct operation.
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