O-Ring Seat Seal Valves (Da) - Baker Hughes Consolidated 19000 Series Instruction Manual

XIII. Maintenance (Cont.)
A4. Machining the Disc Seat
1. When the disc seat cannot be repaired by lapping, it
can be machined as shown in Figure 12, using the
dimensions provided in Table 7.
2. Baker Hughes recommends that the following
procedure be adhered to when machining the disc seat:
a. Grip the disc in a collet.
b. True up the disc so that surfaces marked X and Y
run true within .001" (0.03 mm) on an indicator.
c. Take light cuts across the seating surface until the
damage is removed. Dimensions "R" and "Q", (and
15° angle when applicable) must be maintained.
Table 6: Disc Seat Lapping Width
(-2 Metal Seat Design)
Set Pressure
psig bar
-0.34 to
5 to 800 Flat Flat
-55.16
801 -55.23
Flat Flat
Above Above
1. Add .005" (0.125 mm) per 100 psig (6.896 bar), until disc seat
width has reached the maximum available width.
Figure 12a: Metal Seat Disc (-1 Design)
T
S
Y
Figure 12c: Soft Seat O-Ring Retainer (19096-19126)
S
Y
© 2020 Baker Hughes Company. All rights reserved.
Disc Width
19096 / 19226 /
19110 / 19357/ 19019
19126 19567
in. mm in. mm in.
0.02 -0.51 0.010
Note Note
0.010
1 1
Q
Q
Figure 12: Disc and O-Ring Retainer (Metal Seat & Soft Seat)
d. The disc is now ready for lapping (see Table 6 for
proper seat width).
e. When the minimum thickness dimension "S" is
reached, the disc should be replaced.
B. O-Ring Seat Seal Valves (DA)
1. Replacing the O-ring retainer (3)
If slight damage is present, the O-ring retainer can
be refurbished by either lapping or machining. O-ring
retainer should be replaced if severely damaged or if
dimension S (minimum) is exceeded (see Figure 12 and
Table 7).
The O-ring always should be replaced to ensure
seat tightness.
2. Polishing the base seat
Normally the base seating area on this type of valve is
mm.
not damaged, since the O-ring absorbs the impact when
foreign material is trapped between the O-ring and
-0.254
the base seating area. The O-ring will therefore hold
0.254
a bubble tight seal with slight indications on the base
seating surface. Nevertheless, slight indications on the
base seat surface may be removed by lapping the base.
Figure 12b: Metal Seat Disc (-2 Design)
X
S
R
45˚
Figure 12d: Soft Seat O-Ring Retainer (19226-19567)
S
Y
Consolidated 19000 Series Safety Relief Valve Instruction Manual
ATTENTION!!
Q
T
X
15˚
LAPPED
SURFACE
Q
R
R
45
0
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