Emerson CSB400 Series, Instruction Manual, Page: 17 / 24

CSB400 Series
17
lower casing (key 9), being sure that the pusher post
(key 50) is hooked on the lever (key 10). Rotate the
diaphragm (key 55A) so that the diaphragm and
lower casing (key 9) holes are aligned. Tighten the
stem (key 44) or diaphragm retainer (key 45) for HP
and LP non-relief assemblies.
Disassembly to Replace Valve Disk,
Balanced Port assembly Diaphragm,
and Regulator Orifice
1. Remove the bolts (key 71, Figure 12) which hold
the lower spring casing (key 9) to the body (key 70).
Separate the lower spring casing (key 9) from the
body (key 70).
2. Check the body o-ring (key 21) for wear.
3. Remove the balanced port assembly (key 35,
Figures 12 and 14) from the body, make sure
to rotate the assembly toward the outlet of the
body as it’s being removed to clear the sense tube
from the body.
4. Examine the valve disk (key 35K) for nicks, cuts, and
other damage. If damage is present, it is
recommended to replace both the disk and also the
balanced port diaphragm (key (35F) and associated
diaphragm O-ring (key 35M), that comes into direct
contact with the inner flange of the balanced port
diaphragm. Start the process of replacing the disk by
disassembling the balanced port assembly. Remove
the four cap screws (key 35R) and then the cap
(key 35G).
5. Grasp the spring retainer (key 35C) and slide the
brazed housing (key 35A) away to expose the
diaphragm (key 35F) and disk (key 35K). Still
grasping the spring retainer (key 35C) insert a
5 mm (0.20-inch) Allen wrench into the disk screw
(key 35E) and unscrew.
6. Remove the disk (key 35K) and discard if damaged.
Slide the diaphragm O-ring (key 35M) off the stem
(key 35B) along with the diaphragm (key 35F). Slide
the new diaphragm over the stem in the same manner
that it was removed, make sure that it completely
contacts the surface of the inner retainer (key 35J).
7. Reassemble the Balanced Port assembly in reverse
order of the above.
8. Examine the seating edge of the orifice (key 25)
If it is nicked or rough, replace the orifice and
O-ring (key 27). If a slamshut or monitor is
installed on the backside of the body, refer to
the applicable Instruction Manual for inspection
and removal of the overpressure protection orifice
(key 26) and O-ring (key 27).
9. Reassemble the regulator in reverse order of the
above steps.
Regulator Reassembly
As indicated by the square callouts in Figures 12 to
18, it is recommended that a good quality pipe thread
sealant be applied to pressure connections and fittings
and a good quality lubricant be applied to O-rings.
Also apply an anti-seize compound to the adjusting
screw threads and other areas as needed.
Parts Ordering
The type number, orifice size, spring range, and
date of manufacture are stamped on the nameplate.
Always provide this information in any correspondence
with your local Sales Office regarding replacement
parts or technical assistance.
When ordering replacement parts, reference the key
number of each needed part as found in the following
parts list. Separate kit containing all recommended
spare parts is available.
Parts List
Key Description Part number
Spare Parts (Repair Parts Kit include keys 12, 19,
21, 24, 27, 55, 62, 75, and 77)
Type CSB400 RCSB400X0012
Type CSB403 RCSB403X0012
Type CSB404 RCSB404X0012
1 Spring Case, Aluminum GE24555X012
2 Vent Screen, 18-8 Stainless steel T1121338982
3 Retaining Ring, Steel T1120925072
4 Stabilizer Guide, 304 Stainless steel GE27061X012
5 Stabilizer, Lustran ® 648 GE27063X012
6 Stabilizer Spring GE35010X012
7 Retainer Ring, Stainless steel GE27024X012
8 Stabilizer Screw, Zinc-plated steel (3 required) GE29724X012
9 Lower Casing, Aluminum GE24289X012
10 Lever, Steel
Types CSB400, CSB403, CSB404,
CSB410, and CSB414 GE28772X012
Types CSB420, CSB423, CSB424,
CSB430, CSB434, CSB450, and CSB454 GE28773X012
11 Valve Stem, Aluminum GE27812X012
12* O-ring, Nitrile (NBR)
External Registration Only 1E472706992
13 Lever Pin, 18-8 Stainless steel
Types CSB400, CSB403, CSB404,
CSB410, and CSB414 T14397T0012
Types CSB420, CSB423, CSB424, CSB430,
CSB434, CSB450, and CSB454 (2 required) T14397T0012
14 Lever Screw, Steel
Types CSB400, CSB403, CSB404,
CSB410, and CSB414 (2 required) GE34243X012
Types CSB420, CSB423, CSB424, CSB430,
CSB434 CSB450, and CSB454 (4 required) GE34243X012
15 Cap Screw, ISO CL8 (8 required) GE32059X012
16 Nut, ISO CL8 (8 required) GE32060X012
17 Union Ring, Aluminum GE26590X012
18 Snap Ring, 302 Stainless steel T1120637022
*Recommended spare part.
Lustran ® is a marked owned by LANXESS Corporation