Inspection And Part Replacement; Guide; Base; Coverplate - Baker Hughes Consolidated 4900 Series Instruction Manual

XIV. Inspection and Part Replacement
Main Valve Parts Inspection

1. Guide:

Check I.D. for galling or scratch marks,
especially around the guide and seal surface
areas. Check O-Ring/energize seal contact area
for any corrosion or scratched surfaces that
might cause a leak.
Replace the guide if:
a. Visible galling is present on the inside guiding
surface.
b. Coverplate O-Ring seating areas are pitted
and cause the valve to leak between the
Coverplate and Base.

2. Base:

Inspect general condition for cracks or holes.
Look for any corrosion issues.

3. Coverplate:

Inspect general condition for cracks or holes.
Look for any corrosion issues.

4. O-Ring Retainer:

Inspect surface that sits on the disc for any
corrosion on defects that might cause the disc
not to sit flush with nozzle.
© 2020 Baker Hughes Company. All rights reserved.

5. Spring:

Check for any corrosion issues that might cause
the spring not to operate as designed.

6. Nozzle

Nozzle should be replaced if:
a. Dimension from seat to shoulder after
remachining and lapping is less than H min.
on Table 1.
b. Threads are damaged from pitting and/or
corrosion.
c. Bottom of flange and intersecting surface
are damaged from galling and/or tearing.
d. Seat Width is outside specification (Table 1).
7.

O-Ring Seated Disc:

The O-Ring Retainer cannot be machined. It can
be lapped for minor scratches. If lapping does
not fix damaged area, part must be discarded.

8. Disc Holder:

Should be replaced if the sliding surface is
galled, pitted, or scratched.
Refer to Table 10 for a list of recommended spare
parts and Table 11 for a list of O-Ring repair kits.
Consolidated 4900 MPV Series POSRV Manual
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