22
Reassembly
Assemble the unit using the same procedure as used for disassebling it; but in reverse
order. Observe the following precautions:
1. The PTFE gaskets may be re-used if free from fault, crushing or deformation.
2. Apply anti-seize to the threaded portion of screws and bolts and adjustment screw.
Apply a small amount of anti-seize to the threads of the main valve seat, pilot valve
seat and screen holder to ensure it does not come into contact with other parts.
3. Fasten the bolts one at a time in an alternating diagonal pattern to provide uniform
seating.
4. After the assembly, make sure that the piston and the pilot valve operate smoothly
without binding.
1) Fit the piston ring to the outside of the
tension ring.
2) The ring gaps should be opposite each
other.
5. Standard fastening torque and the distance across flats for the tools to be used
are as follows:
PN-COS-16
Connection Size
Distance
Across Flats
Tightening Torque
Part
(mm) (in) (mm) (in) (N·m)
(lbf·ft)
Bolts
(Spring Housing/
Pilot Body)
15 – 50
17
(
21
/
32
) 40 (29)
Pilot Valve Seat
15 – 50
19
(
3
/
4
) 70 (51)
Pilot Screen
Holder
15 – 50
24
(
15
/
16
) 40 (29)
15 – 40 (
1
/
2
– 1
1
/
2
)
17 (
21
/
32
) 60 (44)
Hex Bolts
(Pilot body/ Main
Body)
50 (2) 19 (
3
/
4
) 70 (51)
15 – 40 (
1
/
2
– 1
1
/
2
)
17 (
21
/
32
) 60 (44)
Hex Bolts
(Main Body/ Trap
Body and Trap body/
Trap Cover)
50 (2) 19 (
3
/
4
) 70 (51)
15, 20
(
1
/
2,
3
/
4
) 36 (1
7
/
16
) 100 (73)
25 (1) 41 (1
5
/
8
) 125 (92)
40 (1
1
/
2
) 60 (2
3
/
8
) 250 (185)
Main Valve Seat
50 (2) 70 (2
3
/
4
) 300 (220)
15, 20
(
1
/
2,
3
/
4
) 8 (
5
/
16
) 7 (5)
25, 40
(1, 1
1
/
2
) 10 (
3
/
8
) 10 (7)
Hex Bolt
(Float Cover)
50 (2) 13 (
1
/
2
) 20 (15)
15, 20
(
1
/
2,
3
/
4
) 11 (
7
/
16
) 10 (7)
25, 40
(1, 1
1
/
2
) 13 (
1
/
2
) 15 (11)
Trap Valve Seat
50 (2) 17
(
21
/
32
) 40 (29)
(1 N
m
10 kg
cm)
NOTE: -If a torque greater than that recommended is applied, the body or components may
be damaged.
-Coat all threaded portions with anti-seize.
-If drawings or other special documentation were supplied for the product, any torque
given there takes precedence over values shown here.
172-65588MA-02 (
PN-COS
Pneumatic Control Valve) 5 Sep 2014
