SERVICE PROCEDURES FOR MODELS 806YD
This device is serviced using the same procedures as the Model 805Y with the following exceptions:
a. Mainline springs are retained on the disc holder with a clamp.
b. For bypass Model 805YB service and repair consult maintenance manual 980116/mm805sm for more information.
b. The meter is removed by loosening the two union nuts. For specific meter service information contact the manufacturer
or their representative directly.
c. Remove and clean in-line strainer mounted in the meter inlet port.
d. Test unit after reassemble to insure proper operation.
SERVICE PROCEDURES FOR MODELS 805YD (2
1
/
2
"– 3)
1. Disassembly-Check Valves
a. Close inlet and outlet shut-off valves. Bleed residual
pressure by opening
#
2,
#
3 and
#
4 testcocks.
b. Remove cover bolts uniformly while holding cover in place.
Remove cover. CAUTION: Spring is retained in body
by cover.
c. Lift spring and check assembly from body.
d. Unscrew bushing (Item 4.1) from cover.
2. Check Assembly Repair
a. Unscrew nut on stem and remove disc washer and
seat disc.
3. Valve Seat Removal
a. Remove seat ring by unscrewing in counterclockwise
direction.
b. Remove bushing and bushing nut.
c. Remove O-Ring.
4. Assembly - Check Valve
a. Use reverse procedure for assembly.
b. NOTE: On older valves the disc holder is sealed
to the stem with permatex. If seal is broken, the
stem and holder must be cleaned and new sealant ap-
plied. Newer valves use an O-Ring and permatex is not
required.
c. Do not apply any grease or oil on the rubber
seat disc.
d. Do not damage epoxy coating.
e. Test unit to insure proper operation.
d. Unscrew capscrew (7.1) using
9
/
16
" hex socket.
e. Release spring tension by unscrewing nuts on long studs.
Use alternating turns to keep tool parallel to valve body.
f. Remove spring guide and stem assembly.
g. Remove seat disc by unscrewing nut on stem.
h. Remove guide bushing by unscrewing.
3. Valve Seat Removal
a. Disassemble check valve.
b. Remove seat disc ring by unscrewing in counterclock-
wise direction. See Seat Removal Tool on page 5 for the
design of a tool that will simplify this process.
c. Remove bushing and bushing nut.
c. Remove O-ring.
4. Assembly - Check Valve
a. Use reverse procedure for assembly.
b. Do not damage epoxy coating.
c. Test unit to insure proper operation.
SERVICE PROCEDURES FOR MODELS 805YD (4" -10")
1. Disassembly-Check Valves
a. Close inlet and outlet shut-off valves. Bleed residual
pressure by opening
#
2,
#
3 and
#
4 testcocks.
b. Remove cover bolts and cover. Unscrew bolts uniformly
to avoid binding of the cover. The spring will push the
cover approximately
1
/
2
" off the top of the valve body.
2. Check Assembly Repair
a. Leave check assembly in body.
b. Install long studs in body 180
o
apart. See Spring Removal
Tool on page 5.
c. Place spring removal tool over stud and retain with
nuts. See Spring Removal Tool on page 5.
CAUTION: To avoid possible injury, do not attempt to
remove spring tension without the use of this tool.
NOTE: Newer devices have the disc holder threaded
on the stem. Therefore, the seat disc can be removed
without releasing spring tension. Threaded disc
holders have four (4) cast lugs, (6 lugs on 10 devices),
1
/
2
" high located on back side, outside the spring
diameter. If the device being serviced does not
have these lugs, spring tension must be released
before further disassembly.
FEBCO Model 805YD & 806YD (2
1
/
2
" - 10")
Page 4
