Type MR105
15
!
WARNINg
Personal injury, equipment damage or
leakage due to escaping fluid may result
if adjusting screw (key 73) and jam
nut (key 72) are not installed properly.
Also, main spring (key 68) may go solid
resulting in the regulator not locking up
if jam nut is not installed and adjusting
screw is adjusted completely down.
26.
Lubricate the adjusting screw (key 73) and thread
on the jam nut (key 72). If pressure-loaded actuator
is used, install the sealing washer (key 71).
Lubricate the adjusting screw and place it into the
spring case (key 70). Thread the adjusting screw
using a hand wrench (not an impact gun) until it
touches the upper spring seat (key 69). Set the
regulator to the desired outlet pressure according to
the procedure in Adjustment section.
For High-Pressure Actuator Diaphragm Replacement
5.
Remove the cap screws (key 57) and hex nuts
(key 58) connecting the diaphragm casings
(keys 62 and 63) and diaphragm (key 56). Lift off
the upper diaphragm casing (key 63).
6.
Unscrew the jam nuts (key 48, detail V) and
remove them from the actuator stem (key 40).
7.
Remove the Belleville spring washer (key 49) and
lower spring seat (key 54) from the actuator stem
(key 40).
8.
Lift off the diaphragm (key 56) from the actuator
stem (key 40) and inspect it for damage. Replace
if necessary. If no further maintenance or
inspection is required, proceed to step 15.
Note
Exercise care to ensure that the
actuator stem (key 40) enters and exits
the lower diaphragm head bore without
pinching, cutting or damaging in any way
the lower diaphragm head O-ring (key 51).
9.
Carefully remove the lower diaphragm head (key 53)
from the actuator stem (key 40). Replace the lower
diaphragm head O-ring (key 51) if necessary.
10.
If it is desired to replace the stem O-rings (key 47,
detail X and Z) and bearings (key 46), disconnect
the control line tubing. Remove the lower
diaphragm casing (key 62) by unthreading it from
the valve body (key 1). Remove stem (key 40)
from the lower casing by pulling on the end of the
stem without threads.
11.
Remove the wiper ring (key 45, detail Z) on the
threaded end of the lower diaphragm casing
(key 62) to reach the bearing (key 46) and stem
O-ring (key 47). Install the new stem O-ring and
bearing and put back the wiper.
12.
Turn the lower diaphragm casing (key 62) over and
install another stem O-ring (key 47) and bearing
(key 46) in the top side of the lower casing.
13. Lubricate the bore on both ends of the
lower diaphragm casing (key 62). Install the lower
casing over the actuator stem (key 40) and thread
into the valve body (key 1). Tighten the lower
casing into the body until the connecting pipe holes
in the casing are located 90° from the valve body
ends for correct tubing alignment. Do not loosen
the bonnet thread to align the pipe holes. Always
tighten the lower casing to make alignment for the
control line.
Note
Position the lower diaphragm casing
(key 62) such that the vent (key 26) is
facing valve body (key 1) inlet, the lube
fitting (key 44) is facing body outlet end
and the 1/2 NPT control line connection
(key 30) is located 90° from the valve
body ends.
Note
Exercise care to ensure that the actuator
stem (key 40) enters and exits the
casing bore without pinching, cutting
or damaging the actuator stem O-rings
(key 47).
14.
The serrated side of the lower diaphragm head
(key 53) should be facing up toward the threaded
end of the actuator stem (key 40). Carefully install
the lower diaphragm head over the actuator stem.
Note
Exercise care to ensure that the
actuator stem (key 40) enters and exits
the lower diaphragm head bore without
pinching, cutting or damaging in any way
the lower diaphragm head O-ring (key 51).
15.
Lubricate the convoluted side of the diaphragm
(key 56) and place over the actuator stem (key 40)
and on top of the lower diaphragm head (key 53).
The convolutions of the diaphragm should be
pointing up.
