Consolidated 1811 Series Safety Valve Instruction Manual
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© 2020 Baker Hughes Company. All rights reserved.
XIX. Recommended Spare Parts
Retrofit - Thermodisc
Retrofit Kits have been developed for converting
older 1811 Series Valves from solid disc to
Thermodisc design. The Kits include a new spindle
and disc. The Thermodisc design provides a
significant improvement in seating tightness. The
Retrofit can be installed during a routine overhaul at
very little additional cost.
A retrofit tag should be added beneath the original
nameplate to reflect this design change.
Note: Older 1811 Safety Valves have bottom
spring washers which may require changing
when retrofitting.
Table 11
Class
Part No.
1
Part Name
Ratio Parts/
Valves (Minimum)
Ratio Parts/
Valves
(Maximum)
Predicted
Availability
I
3
Disc
1/3
1/1
70%
5
Adj. Ring Pin (Lower)
1/3
1/1
7
Adj. Ring Pin (Upper)
1/3
1/1
II
4
Adj. Ring (Lower)
1/5
1/3
85%
6
Adj. Ring (Upper) 1811B
1/5
1/3
Adj. Ring (Upper) 1811D
1/5
1/3
11
Spindle
1/5
1/3
III
2
Seat Bushing
1/5
1/3
95%
12
Bottom Spring Washer
1 Set/5
1 Set/3
13
Spring
1/5
1/3
14
Top Spring Washer
1/5
1/3
15
Compression Screw
1/5
1/3
IV
16
Compression Screw
Locknut
1/5
1/3
99%
17
Cap (F, G, H & J)
1/5
1/3
Cap (K, L, N, P & Q)
1/5
1/3
18
Cap Set Screw
1/5
1/3
19
Lever
1/5
1/3
20
Release Nut
1/5
1/3
21
Lever Pin
1/5
1/3
22
Top Lever (4” & 6” Sizes)
1/5
1/3
23
Drop Lever (4” & 6” Sizes)
1/5
1/3
24
Release Locknut
1/5
1/3
1.
The 1811 Seat Bushing is welded into the body. It is not replaceable in the field. Return to Factory for replacement, or
order new Body-Bushing Assembly.
Design Code Key:
FSD - Flat Solid Design is designated by a “-20” or “-21” in the valve code on the nameplate
(example: 1 1/4” 1811 FA-0-3X1-20).
TD - Thermodisc Design is designated by a “-22” or “-23” in the valve code on the nameplate
(example: 1 1/4” 1811 FA-0-3X1
-22). Will be furnished in all 1811 Valves shipped after January 1984, unless
otherwise specified by customer.
