FEBCO 856ST User Manual [en, es, fr]
IS-F-850/856-DC/DCDA
Installation Instructions • Instrucciones de instalación • Instructions d’installation
Series 850, LF850, 856, LF856 and 856ST
Serie 850, LF850, 856, LF856 y 856ST
Séries 850, LF850, 856, LF856 et 856ST
Double Check Valve Assemblies
Double Check Detector Assemblies
Montajes con válvula de retención doble
Montajes de detección de retención doble
Dispositif à double clapet
Détecteur à double clapet
1
Size: 2
Tamaño: 65 a 250 mm (21⁄ 2 a 10 pulg.)
Dimensions : 65 mm à 250 mm (2,5 po à 10 po)
⁄2" - 10" (65-250mm)
Series 850 / Serie 850 / Série 850
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.
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 warrant. 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 (133kPa).
2. These instructions apply to Series 850,
LF850 (DC), 856, LF856 and 856ST
(DCDA), sizes 2
250mm). The valves may be installed
only in the orientation/flow direction as
shown. The gate valves may be rotated
as permitted by the flange bolt pattern
on vertical installations only.
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
1
⁄2" to 10" only (65 –
the valve body. DO NOT LIFT THE
ASSEMBLY BY CONNECTING TO
THE GATE VALVE HANDWHEELS OR
STEMS.
6. 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.
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.
7. 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.
2
Typical Installation
RWWP
FRT
4175
Flow
Flow
HORIZONTAL INSTALLATION OF THE DC SERIES 850
(FRONT VIEW, SHOWN WITH STRAINER)
HORIZONTAL INSTALLATION OF THE DC SERIES 850
(TOP VIEW, SHOWN WITH STRAINER)
12" min. (300mm)
Refer To Local Codes
6" min. (150mm)
Refer To Local Codes
6" min. (150mm)
Refer To Local Codes
18" min. (45mm)
Figure 1
FRT
HORIZONTAL INSTALLATION OF THE DC SERIES 850, LF850
& DCDA SERIES 856, LF856, 856ST
(Front View, Shown With Strainer)
RWWP
4175
Flow
12" Min (300mm)
Refer to Local Codes
6" Min (150mm)
Refer to Local Codes
Figure 2
Flow
HORIZONTAL INSTALLATION OF THE DC SERIES 850, LF850
& DCDA SERIES 856, LF856, 856ST
(Top View, Shown With Strainer)
Figure 3
12" Min (300mm)
Refer to Local Codes
6" Min (150mm)
Refer to Local Codes
VERTICAL
INSTALLATION
OF THE DC
SERIES 850,
LF850 & DCDA
SERIES 856,
LF856, 856ST
(Front View,
Shown With
Strainer)
4175
RWWP
FRT
Flow
6" Min (150mm)
Refer to Local Codes
18" Min (450mm)
Figure 4
6" Min (150mm)
Refer to Local Codes
18" Min (450mm)
12" (300mm) minimum
above all downstream
piping and use
VERTICAL
INSTALLATION OF THE
DC SERIES 850, LF850
& DCDA SERIES 856,
LF856, 856ST
(Top View, Shown
With Strainer)
CHECK WITH LOCAL
CODE REQUIREMENTS
3
Servicing Check Valve Assemblies
General
FEBCO recommends yearly maintenance. Consult your local codes for requirements in
your area.
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.
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.
Disassembling the Check Valve
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 approxi-
1
mately
⁄4 inch.
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
FEBCO recommends the use of
the appropriate annual test method
presented in the ASSE Series 5000
manual that is consistent with your
localcodes.
Troubleshooting for Double Check Assemblies
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
b. Bypass line plugged Disassemble and clean
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