Type MR105
11
Table 6.
Type MR105 Product Assembly Torque
PART NAME AND KEY NUMBER
TORQUE
NPS
1 / dN 25
Body Size
NPS
2 / dN 50
Body Size
NPS
3 / dN 80
Body Size
NPS
4 / dN 100
Body Size
FT-LB
N•
m
FT-LB
N•
m
FT-LB
N•
m
FT-LB
N•
m
Body Flange Studs and Nuts (keys 3 and 29)
75 to 95
102 to 129
50 to 65
68 to 88
100 to 130 136 to 176 160 to 210 217 to 285
Lower Indicator Fitting (key 5)
90 to 130
122 to 176
90 to 130
122 to 176
90 to 130
122 to 176
90 to 130
122 to 176
Indicator Plug (key 27)
90 to 130
122 to 176
90 to 130
122 to 176
90 to 130
122 to 176
90 to 130
122 to 176
Indicator Fitting (key 35)
60 to 90
81 to 122
60 to 90
81 to 122
60 to 90
81 to 122
60 to 90
81 to 122
Actuator Stem Jam Nuts (key 48)
12 to 14
16 to 19
12 to 14
16 to 19
12 to 14
16 to 19
12 to 14
16 to 19
Low Pressure:
Actuator Flange Cap Screws and Nuts
(keys 57 and 58)
27 to 29
37 to 39
27 to 29
37 to 39
27 to 29
37 to 39
27 to 29
37 to 39
High Pressure:
Actuator Flange Studs and Nuts
(keys 57 and 58)
45 to 55
61 to 75
45 to 55
61 to 75
45 to 55
61 to 75
45 to 55
61 to 75
Bonnet and Spring Case Spacer Cap Screws (key 65)
10 to 12
14 to 16
10 to 12
14 to 16
10 to 12
14 to 16
10 to 12
14 to 16
Spring Case Cap Screws (key 67)
25 to 28
34 to 38
25 to 28
34 to 38
25 to 28
34 to 38
25 to 28
34 to 38
Note: All studs, screws and nuts shall be lubricated. All final torque values shall be verified with a calibrated torque wrench.
Apply the lubricants as the regulator is being
reassembled. All O-rings, gaskets and seals should
be lubricated with a good grade of general-purpose
lubricant and installed gently rather than forced into
position. Refer to Table 6 for torque specifications. Refer
to Figure 6 while servicing Type MR105 regulators.
Replacing Travel Indicator Assembly
If the trim parts are replaced, the travel indicator
should also be replaced. The Quick Change Travel
Indicator Kit includes a travel indicator assembly,
including all necessary elastomers for the travel
indicator. The elastomer repair kit does not
contain the elastomeric components for the travel
indicator assembly.
1.
Remove the travel indicator assembly by removing
the lower indicator fitting (key 5) from the body
flange (key 2).
2.
Coat the threads of the lower indicator fitting (key 5)
with a good grade of general-purpose lubricant.
3.
Install the travel indicator assembly; torque
the lower indicator fitting (key 5) to 90 to
130 ft-lbs / 122 to 176 N•m.
4.
Check indicator zeroing by unscrewing the
indicator protector (key 19) and seeing if the flange
of the flanged nut (key 22) lines up evenly with
the closed mark on the indicator scale (key 18). If
not, remove the indicator scale and separate the
flanged nut and hex nut (key 8). Hold the indicator
scale against the indicator fitting (key 35) with the
scale base resting against the smallest shoulder of
the fitting and turn the flanged nut until its flange
is aligned with the closed scale marking. Then
lock both nuts against each other and install the
indicator scale and protector.
Replacing Trim Parts
Perform this procedure when inspecting, cleaning or
replacing individual trim package parts.
CAUTION
All disassembly, trim change and
reassembly steps in this section may be
performed with the regulator in the main
line. The trim for NPS 3 and 4 / dN 80
and 100 is heavy (see Table 7) and may
be awkward to remove or reinstall in
some valve/pipeline orientations. Follow
your company policy for lifting and
handling heavy parts.
Note
Access to the valve spring (key 9) and travel
indicator parts in step 1 can be gained
without removing the body flange (key 2).
Body SIze
TRIM WEIgHT WITH
TRAVEL INDICATOR
TRIM WEIgHT WITHOUT
TRAVEL INDICATOR
NPS
DN
LB
kg
LB
kg
1
25
9
4.1
8
3.6
2
50
15
6.8
14
6.4
3
80
30
14
28
13
4
100
49
22
48
22
Table 7.
Type MR105 Trim Weight
