D I S T R I B U T E D V A L V E S
6
02/2011 / IOM-WHE-CHECK-822
Installation, Operation and Maintenance Manual
MAINTENANCE
CAUTION
: Safety practices for pressurized equipment must be followed and
address hazards inherent in pressurized systems. Extreme caution and safety
procedures are to be exercised whenever valves, or fittings on a valve, are
serviced or maintained.
DISASSEMBLY
:
No special tools are required to disassemble the valve.
With all pressure removed
from the associated piping system
, the valves can be serviced in-line or offline.
During in-line maintenance, the swing check valve should be isolated from and
relieved of all pressure on both the upstream and downstream sides. Ensure all
line pressure is relieved before removing the plug on the cover.
Exercise extreme
caution
when removing the plug on the cover. Any residual pressure can cause
the plug to eject unsafely from the cover. Drain the valve fully through the piping
system. Remove the cover, clapper, and hanger (Figure 1).
For offline maintenance, the valve should be removed from the pipeline.
INSPECTION
Inspect the clapper and body seating surface for possible scoring marks or damage. These surfaces
must be smooth. During maintenance, replace the clapper seal with a new seal. Inspect the cover
O-ring seal for damage. Generally, the cover O-ring will last longer than the clapper seal.
REASSEMBLY
Reassemble the valve in accordance with the following instructions. See Figure 1 (page 7):
1.
INSTALL SEAL, 7, INTO CLAPPER 4.
2.
INSTALL CLAPPER, 4, INTO HANGER, 5
3.
INSTALL HANGER, 5, WITH CLAPPER, 4, INTO BODY, 1.
4.
INSTALL SEAL, 6, INTO COVER, 2. LUBRICATE THREADS WITH TS-115 LUBRICANT.
5.
THREAD COVER, 2, INTO BODY, 1.
6.
TIGHTEN COVER, 2, ACCORDING TO CHART ON PAGE 7.
7.
WRAP PIPE PLUG, 3, WITH PTFE TAPE 1-2 TURNS (PTFE PASTE MAY ALSO BE USED), AND
INSTALL INTO COVER 2.
8.
ENSURE THAT THE CLAPPER SWINGS FREELY INSIDE THE BODY, IS FREE OF OBSTRUCTIONS
AND WILL CLOSE WITHOUT BINDING.
!
CAUTION
!
DANGER
