FEBCO 876VST User Manual [en, es, fr]
IS-F-870V/876V-DC/DCDA
Installation Instructions • Instrucciones de instalación • Instructions d’installation
S eries 870V, 876V, LF870V, LF876V and 876VST
Series 870V, 876V, LF870V, LF876V y 876VST
Séries 870V, 876V, LF870V, LF876V et 876VST
Double Check Valve Assemblies
Double Check Detector Assemblies
Montajes con válvula de retención doble
Montajes de detección de retención doble
Dispositifs à double clapet
Détecteur à double clapet
1
Size: 2
Tamaño: 65 a 250 mm (2
Dimensions : 65 mm à 250 mm (2,5 po à 10 po)
⁄2" - 10" (65-250mm)**
1
⁄2 a 10 pulg.)
** Metric Dimensions are nominal pipe diameter.
This product is produced with ASME/ANSI
flanged end connections.
** Las dimensiones métricas representan el
diámetro nominal de la tubería. Este producto
está fabricado con conexiones ASME/ANSI
embridadas.
** Les dimensions métriques correspondent
au diamètre nominal du tuyau. Ce produit est
fabriqué avec des raccordements d'extrémité à
brides ASME/ANSI.
Series 876V / Serie 876V / Série 876V
ENGLISH INSTRUCTIONS
!
WARNING
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can result in death,
serious personal injury, property damage, or damage to the equipment.
Keep this Manual for future reference.
!
WARNING
You are required to consult the local building and plumbing codes prior to installation. If the information in this manual is not consistent with local building or plumbing codes, the local codes should be followed. Inquire with governing authorities for
additional local requirements.
!
WARNING
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
warrant. All products must be retested once maintenance has been performed. 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/LF876V/876VST
sizes 21⁄2" to 10" (65-250mm) only. The
valves may be installed only in the orientation/flow direction as shown. All 870V/876V
and LF870/LF876V/876VST assemblies are
shipped in the horizontal installation orientation only. The gate valves may be rotated
as permitted 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 disassembly
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 the sup-
ply line (with the correct centerline) 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 support
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 21⁄2"
(65mm) valves will use a 3" pipe support).
NOTICE
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.
2
NOTICE
All assemblies are tested at the factory for
proper operation and leakage. If the valve
does not pass the field test, it is most
likely due to a fouled check valve. This is not
covered by the factory warranty. The valve
cover(s) must be removed and the check
seats inspected and cleaned. Any damage
or improper operation caused by pipeline
debris or improper installation/start-up is not
included in the factory warranty. In case of
a possible warranty claim, contact your local
supplier or FEBCO Representative. DO NOT
REMOVE THE VALVE ASSEMBLY FROM THE
PIPELINE.
Typical Installation
Figure 1
18" Min. (450mm)
18" Min.
(450mm)
Refer to
Local Codes
8. The assembly must be protected from
freezing and excessive pressure increases.
Thermal expansion or water hammer can
cause pressure increases. These excessive
pressure situations must be eliminated to
protect the valve and system from possible
damage.
NOTICE
The flange gasket bolts for the gate valves
should be retightened during installation as
the bolts may have loosened due to storage
and shipping.
N-PATTERN INSTALLATION
FOR THE DC SERIES 870V/
LF870V & FOR THE DCDA
SERIES 876V/ LF876V/ 876VST
(Shown with Strainer)
6" Min.
18" Min.
(450mm)
(150mm)
Figure 2
FLOW
18" Min. (450mm)
18" Min.
(450mm)
Refer to
Local Codes
FLOW
VERTICAL INSTALLATION FOR THE DC SERIES
870V/LF870V & FOR THE DCDA SERIES 876V/ LF876V/ 876VST
(Shown with Strainer)
3
Pipe Support
(Furnished by Customer)
Service and Mainternance
General
1. Detailed maintenance manuals are
available from your local Febco
representative.
2. Rinse all parts with clean water prior to
reassembly.
3. DO NOT USE ANY PIPE DOPE, OIL,
GREASE OR SOLVENT ON ANY PARTS
unless instructed to do so.
Check Valve Disassembly
4. Do not force parts. Parts should fit
together freely. Excess force may
cause damage and render the assembly
inoperable.
5. Carefully inspect seals and seating
surfaces for debris or damage.
6. After servicing, repressurize the
assembly and test to ensure proper
operation.
1. Close the outlet shutoff valve, then close
the inlet shutoff valve. Bleed residual
pressure from the assembly by opening
the #4, #3, and # 2 test cocks in this
sequence.
2. Remove the cover bolts/nuts and lift the
cover from the body. The springs are
retained and the cover should be pushed
away from the body approximately
inch.
1
⁄4
3. Inspect/clean debris from the disc and
seat ring. Replace worn or damaged
parts as required.
4. Replace the cover, ensure the spring
assembly is positioned in the pivot
socket. If necessary, apply FDA approved
grease to the O-ring groove in the body
to keep the O-ring in position while
installing the cover.
5. Install the bolts and nuts and tighten.
Test Procedure for Double Check Valve Assemblies
FEBCO recommends the use of the
appropriate annual test method presented
in the ASSE Series 5000 manual that is
consistent with your local codes.
Troubleshooting
PROBLEM CAUSE SOLUTION
1. Check valve leaking a. Debris on seating surface Disassemble and clean
b. Leaking shutoff valve Disassemble and clean
2. Low flows passing through a. Mainline check fouled Disassemble and clean
mainline valve (DCDA). b. Bypass line plugged Disassemble and clean
4
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