User Guide

FEBCO Model 850 / 850U (
1
/
2
" - 2") Page 5
SEAL REPLACEMENT
Both check assemblies are disassembled and
reassembled in the same manner. To service the
checks you may replace the check modules with new
ones by using check module assembly kits available
from FEBCO. Or, you may also replace the rubber
components in the check modules by using the
replacement rubber parts kits available from FEBCO.
For details on parts and kits please see pages 6 - 8.
1. To disassemble, grasp the seat section (item 3) in
one hand and the guide section (item 7) in the
other hand and then rotate in a counter clock wise
direction (approx.
1
/
8
turn) until the two parts
disengage.
2. Remove retaining screw (item 5.2) and disc
retainer (item 5.1) so the rubber disc is fully
exposed. Carefully pry out the rubber disc from
poppet. Be careful not to damage the poppet
when removing the disc. Rinse poppet in clean
water and replace the old rubber disc with new
rubber disc. If the rubber disc is not damaged it
can be reversed and reinstalled when a new disc
is not available. Rinse all other internal compo-
nents with clean water. Replace disc retainer and
secure with retaining screw (item 5.2).
3. Reassemble check module in the reverse manner
as indicated in above. When reassembling the
check module be sure to insert the poppet stem
into the guide hole and keep fingers clear of the
slots in the module.
CHECK MODULE RE-ASSEMBLY
Use reverse procedure for assembly with the follow-
ing special instructions.
1. Inspect the check module o-ring (item 3.1) for
damage and replace if necessary. To ease assem-
bly, apply a thin coating of FEBCO factory sup-
plied petroleum jelly (food grade) to the o-ring
(item 3.1) prior to installing in body. CAUTION:
Excess lubricant may cause foreign debris to
collect on internal components which could foul
the check assembly and result in a test failure.
2. The word INLET is inscribed on the end of each
module. That end should face the inlet of the
valve.
3. When replacing spacer (item 8) between the two
check assemblies be sure that the flanged end of
the spacer is touching the back side of the inlet
check assembly so that the cover will fit properly.
Next, replace cover making sure
#
3 test cock is on
the upstream side. Do not over tighten cover bolts
(Approximately 35 inch-pounds is sufficient).
4. After reassembling, close test cock
#
2,
#
3 and
#
4
(test cock
#
1 should already be closed), slowly
open inlet ball valve. Bleed air from the unit by
opening and closing test cock
#
2, then
#
3 and
finally
#
4.
5. Check for external leaks and repair if necessary.
Slowly open outlet ball valve.
6. Test assembly in accordance with the locally
approved test methods.