6
1. Remove the relief valve cover bolts. Note the 4000CIV is
designed so that when the bolts are backed off
1
/
2
" all the
relief valve spring load is retained by the bottom plug spring
module.
CAUTION:
Be sure to verify this before removing all
the bolts.
2. Remove the cover and diaphragm. The relief valve piston
assembly can be lifted straight up and out.
3. Replace the wiper seal and piston O-ring and apply grease
to the O-ring.
4. To replace the relief valve disc, hold the upper guide fin and
unscrew the diaphragm pressure plate. It may be necessary
to lightly tap the cast webs and the pressure plate to
loosen. Replace with a new disc holder assembly and O-
ring. Note: the disc rubber is molded into the disc holder
and is supplied as a disc holder assembly.
5. Removal of the bottom plug and spring assembly. During
normal field service there is no need to remove the bottom
plug spring assembly other than inspection. It can be
removed by simply unscrewing with a large pipe wrench.
CAUTION:
The spring as retained on the bottom plug is
highly loaded.
NO
attempt should be made in the field to remove the
spring. For replacement, a complete bottom plug assembly
must be obtained from the factory.
For further details contact your technical sales repre-
sentative, see back page.
Servicing the Relief Valve
Repair Kits
When ordering, specify Ordering Code, Kit Number and Valve Size.
Relief Module
B
Clearance Required for Servicing
A
B
in.
mm
in.
mm
in.
mm
2
1
/
2
– 3 65 – 80
10
254
11
279
4
100
15
381
14
356
6
150
15
381
16
406
8
200
23
584
21
533
10
250
25
635
21
533
Adapter O-ring
Diaphragm
Diaphragm
Relief
Valve Disc
Relief Valve
Piston Assembly
Piston "O" Ring
Seat
O-ring
Sizes 2
1
/
2
" –
3"
(65-80mm)
Relief Valve
Piston Assembly
Piston Seal
Seat
O-ring
Sizes
4", 6"
(100-250mm)
Plug &
Spring
Piston
Assembly
Adapter O-ring
Diaphragm
Relief Valve
Assembly
Seat
O-ring
Plug &
Spring
Assembly
Sizes
8", 10" (200-250mm)
ORDERING CODE
KIT NO.
SIZE
in.
mm
Relief Valve Rubber Parts
7016266
ARK 4000CIV RV
2
1
⁄
2
– 3
65-80
7016267
ARK 4000CIV RV
4 – 6
100-150
7016268
ARK 4000CIV RV
8 – 10
200-250
Kit includes: Sleeve O-ring, Seat O-ring, Piston O-ring, Stem O-ring, RV Disc
Assembly, Diaphragm, Piston Seal, Bottom Plug O-ring and Lubricant
Relief Valve Total
7016270
ARK 4000CIV VT
2
1
⁄
2
– 3
65-80
7016271
ARK 4000CIV VT
4 – 6
100-150
7016272
ARK 4000CIV VT
8 – 10
200-250
Kit includes: Adapter O-ring, Diaphragm, Disc & Piston Assembly Seat, Seat O-ring
and Lubricant
Cover Kits
7016274
ARK 4000CIV C
2
1
⁄
2
– 3
65-80
7016275
ARK 4000CIV C
4
100
7016276
ARK 4000CIV C
6
150
7016277
ARK 4000CIV C
8
200
7016278
ARK 4000CIV C
10
250
Kit includes: Cover, Cover O-ring and Lubricant
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