User Guide

Page 4 FEBCO Model 850 / 850U (
1
/
2
" - 2")
TROUBLE SHOOTING GUIDE
Symptom
#
1
Check fails to hold 1.0 PSID min.
Symptom
#
2
Chatter during flow conditions.
Symptom
#
3
Low flows passing through the
mainline valve.
Cause:
A. Debris on sealing surfaces
B. Leaking shut-off valve
C. Damaged seat or seat disc
D. Spring stem not moving freely
Cause:
A. Worn or damaged parts
Cause:
A. Mainline check fouled
Solution:
Inspect and clean
Inspect and clean, or repair
Disassemble and replace
Inspect for debris or damage
Solution:
Inspect and replace
Solution:
Inspect and clean, or repair
CHECK MODULE DISASSEMBLY
1. Slowly close inlet and outlet ball valves. Bleed
residual pressure by opening
#
2,
#
3, and
#
4 test
cocks. Allow the test cocks to remain open until
the reassembling is completed. Test cock
#
1
should remain closed.
2. Remove the cover bolts (item 21) using the
appropriate size wrench.
3. Remove spacer (item 8) by grasping the flanged
end of the spacer and pulling straight up.
4. Remove the inlet check assembly by pulling it in
the direction of flow out from the body bore until it
is completely exposed then lift out of the body.
5. Remove the outlet check assembly by placing the
tip of a medium size flat nose screw driver in the
slot of the seat (item 3) and prying the check
assembly back until the red o-ring (item 3.1) is
exposed. Then, using your fingers, pull it out from
the body bore until it is completely exposed then
lift out of the body.