4
Check Module Reassembly
Reverse the disassembly procedure to reassemble the unit along
with the following special instructions.
1. Inspect the check module O-ring (Item 3.1) for damage and
replace if necessary. To ease assembly, apply a thin coating of
the supplied lubricant to the O-ring before installing into the 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. Make sure the end of each module inscribed with the word INLET
is facing the inlet of the valve.
3. When installing the check modules, make sure the check
assembly with the heavy duty spring is inserted in the inlet bore of
the body (first check position). Position the first check assembly so
that one (1) of the four (4) flow path windows is face-down toward
the relief valve. The check assembly with the weaker spring must
be installed in the outlet bore of the body (second check position).
4. When replacing the spacer (Item 8) between the two check
assemblies, be sure the flanged end of the spacer is touching
the back side of the inlet check assembly so that the cover fits
properly. Next, replace the cover making sure test cock No.
3 is on the upstream side. Do not over tighten cover bolts.
(Approximately 35 inch-pounds is sufficient.)
5. After reassembling, close test cocks No. 2, No. 3, and No. 4 (test
cock No. 1 should already be closed), then slowly open the inlet
ball valve. Bleed air from the unit by opening and closing test cock
No. 2, next No. 3, then No. 4.
NOTICE
During the bleeding process, the relief valve may discharge a high
volume of water until all test cocks have been closed and pressure
stabilized.
Relief Valve Repair
Discharge from the relief valve assembly may not indicate a relief
valve failure. Water is discharged from the relief valve when the
mainline check valves become fouled with foreign debris. (For more
information, see "Troubleshooting" before disassembling the relief
valve.) Detach the flood sensor and activation module if in use.
1. Slowly close the inlet and outlet ball valves. Bleed off air from
the unit by opening and closing test cock No. 2, next No. 3,
then No. 4. Test cock No. 1 should remain closed.
2. Loosen the brass cylinder in the center of the relief valve cover
(Item 18) by unscrewing
1
⁄
4
turn (counterclockwise). Remove the
relief valve cover bolts (Item 21) and the relief valve cover (Item 19).
3. The internal relief valve assembly module is attached to the relief
valve cover. Unscrew the brass cylinder and remove from cover.
Grasp the outer diameter of the large outer diaphragm (Item 15)
and pull it away from the cover until the small outer diaphragm
(Item 16) comes out through the relief valve cover hole and is
completely separated from the relief valve cover. Discard the old
internal relief valve assembly module. Remove the plastic slip
rings (Item 18.1) and discard each one. Slide out the seat ring
(Item 12) and seat gasket ring (Item 12.1) from the relief valve
body and discard.
4. Apply a thin coating of the supplied lubricant to both sides of the
new seat gasket ring (Item 12.1), and slide it on the short end of
the new seat ring (Item 12). Slide the short end of the new seat
ring into the hole of the relief valve body. (The adhesion from
the lubricant holds the seat ring in place during the rest of the
assembly process.)
NOTICE
If applying new diaphragms from a rubber kit, ensure the
smooth rubber side of each diaphragm is facing outward
before assembly.
6. Check for external leaks and repair, if necessary. Slowly open
the outlet ball valve.
7. Test the assembly in accordance with locally approved methods.
