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CSB400 Series

6. Reassemble the spring case (key 1) unit in the

reverse order of the above steps. Before tightening

the cap screws (key 15) or stem (key 44) into the

pusher post (key 51), place the loosely-assembled

diaphragm assembly (key 55) into position in the

lower casing (key 9), being sure that the pusher post

(key 51) 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 Orice

1. Remove the bolts (key 71, Figure 11) 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 11 and 13) from the body, make sure to

rotate the assembly toward the outlet of the body

as it is 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 ange 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 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. Ensure Dow Corning

33 or

comparable extreme low temperature lubricant

completely coats the O-ring (key 35M), stem

(key 35B) and the center bore of the outer retainer

(key 35H).

8. Examine the seating edge of the orice (key 25). If

it is nicked or rough, replace the orice and O-ring

(key 27). If a slam shut or monitor is installed on

the backside of the body, refer to the applicable

Instruction Manual for inspection and removal of the

overpressure protection orice (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 11 to 17, it

is recommended that a good quality pipe thread sealant

be applied to pressure connections and ttings and a

good quality extreme low temperature lubricant, such

as Dow Corning

33, be applied to O-rings. Also apply

an anti-seize compound to the adjusting screw threads,

orice threads and other noted areas as needed.

Parts Ordering

The type number, orice size, spring range and date of

manufacture are stamped on the nameplate. Always

provide this information in any correspondence with

your local Sales Ofce 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.

Dow Corning

is a mark owned by Dow Corning Corporation.

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