FEBCO 876VST Master Series Configurable Design Double Check Detector Assemblies - Manual (Page 4)

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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.
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.
Check Valve Disassembly
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 1 ⁄
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 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