172-65191MA-03 (RT3A) 28 Apr 2009
8
Disassembly / Reassembly
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble. (Installation, inspection, maintenance, repairs, adjustment and
valve opening/closing should be carried out only by trained maintenance personnel.)
Dissassembly / Reassembly Procedure
Part
During Disassembly
During Reassembly
Union Nut
If removing the trap from the piping, first
remove the union nut with a wrench
—
Union Nipple
Remove from piping only if necessary
—
Union Gasket
—
Replace with a new gasket if warped or
damaged
Cover
Remove the cover from the body using a
wrench (do not disassemble the cover
itself)
Consult the table of tightening torques
and tighten to the proper torque
Cover Gasket
—
Replace with a new gasket if warped or
damaged
Thermo-element Remove from the body being careful not
to bend the push-pin
Replace with a new thermo-element if
damaged or leaking wax
Element Guide
(Valve)
Remove from the body being careful not
to scratch the valve seating surface
Insert into body being careful not to
scratch the valve surface
Return Spring
Remove from the body
Place inside body
Valve Seat
Remove from the body using a box
wrench being careful not to scratch seat
surface
Insert being careful not to scratch seat
surface; consult the table of tightening
torques and tighten to the proper torque
Valve Seat
Gasket
—
Replace with a new gasket if warped or
damaged
Torque Tightening Table
Connection Size
Torque
Distance Across Flats
Part
mm (in) N·m
(lbf·ft)
mm (in)
15 (
1
/
2
) — 32
(1
1
/
4
)
Union Nut
20 (
3
/
4
) — 38
(1
1
/
2
)
15 (
1
/
2
) — 19
(
3
/
4
)
Union Nipple
20 (
3
/
4
) — 24
(
15
/
16
)
Cover 15,
20
1
/
2
,
3
/
4
40 (29) 24 (
15
/
16
)
Valve Seat
15, 20
1
/
2
,
3
/
4
15 (11) 12 (
15
/
32
)
1 N
⋅
m
≈
10 kg
⋅
cm
Minimum Maintenance Space
Required for Disassembly
(3
1
/
8
”)