Consolidated 2478 Series Pressure Relief Valve Manual
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XIII. Reassembly of 2478 Series Relief Valve
Figure 3: 2478 Soft Seat Assembly
1. Clean seats and all parts
2. Disc Assembly:
a. Clean disc and place it on a level metallic plate
as shown in Figure 3. Disc surface having the
spindle pocket will lie on the metal plate.
b. Pick-up proper soft seat; clean this with lint free
cloth. Inspect it for nicks, cuts, dents (defective
soft seat should be rejected). Place soft seat
onto the disc as shown in Figure 3.
c. Pick-up proper retaining ring and tool assembly
(see Table 1). Place retaining ring on the disc
post (see Figure 3). Subsequently put the
retaining ring tool assembly in a mechanical
press (not shown in Figure 3). By applying slight
force, position retaining ring over the disc post.
Inspect the ring to ensure its proper positioning.
Subsequently, press the ring hard enough to
move it down to provide tight retaining of the
soft seat. A properly assembled soft seat will be
somewhat compressed by the retaining ring.
3. Place spindle into disc pocket.
4. Insert disc, spindle, spring and spring washer
assembly into bonnet.
5. Holding bonnet upside down (so that disc will not
drop), install the base to the bonnet assembly.
Tighten bonnet on base using torque values:
D: 50 ft-lb (68 N-m), E: 60 ft-lb (81 N-m),
F: 65 ft-lb (88 N-m), G: 75 ft-lb (102 N-m),
H: 90 ft-lb (122 N-m), J: 100 ft-lb (136 N-m).
6. Assemble compression screw and provide
spring compression by two turns of compression
screw. The desired spring compression must be
established.
Table 1: 2478 Bronze Safety Valve
Soft Seat Assembly Tools
Valve Type
Retaining Ring
Assembly Tool
No.
2478D
2091155
7530163-1
2478E
2091156
7530163-3
2478F
2091157
7530163-5
2478G
2091158
7530163-7
2478H
2091160
7530163-9
2478J
2091162
7530163-11
Retainer Ring
Holding Tool
Disc
Post
Soft Seat
Retainer
Ring
Metal
Plate
