Flowserve Limitorque Accutronix MX User manual

Limitorque Actuation Systems
FCD LMENIM2312-00
Limitorque®
Accutronix MX
Quick Mounting Instructions

3Accutronix MX Quick Mounting Instructions • LMENIM2312
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Limitorque Actuation Systems
The Limitorque Accutronix MX is the technological leader
among electric actuators and the simplest device to install
and commission. Follow this simple step-by-step installation
guide to install the MX on all valve types. Refer to the
following documents for more set-up information:
• LMAIM2310, Quick Start-Up Instructions
calibration of valve position limits
• LMAIM2306, Installation and Operation Manual
complete installation instructions
Contents
Preparing the Stem Nut 4
Type “B” Bases: Torque-only Applications 4
Standard B4/B4E Base 4
Optional B1 Base (not applicable for MX-85 or -140) 5
Type “A” Bases: Thrust-only Applications 6
Standard A1/A1E Base 6
Type “BL” Drive: Splined-drive Applications (not applicable for MX-85 or -140) 11
Mechanical Installation of MX Actuator onto Valve or Gearbox 11
Mounting (Type “B” Bases): Torque-only 12
Removal (Type “B” Bases): Torque-only 12
Mounting (Type “A” Bases): Thrust-only 12
Removal (Type “A” Bases): Thrust-only 13
Checking the Settings 13

4LMENIM2312 • Accutronix MX Quick Mounting Instructions
Flow Control
Limitorque Actuation Systems
Preparing the Stem Nut
The Accutronix MX has two (2) basic base designs:
• Torque-only base, designated by a “B” prefix
• Thrust-only base, designated by an “A” prefix
Type “B” Bases: Torque-only Applications
Standard B4/B4E Base
The standard MX actuator base is the B4 torque-only and includes a
mounting plate and steel torque nut, which may be machined to fit a
valve or gearbox.
A B4E torque nut can be provided and may be installed to allow for
extended stem acceptance.
B4 base B4E base
Exploded view of B4/B4E base
Torque nut
Retaining ring
Baseplate
Accutronix MX
base
Drive sleeve

5Accutronix MX Quick Mounting Instructions • LMENIM2312
Flow Control
Limitorque Actuation Systems
Disassembly
1. Remove the retaining ring (B4 base) or spiral-wound ring (B4E base)
that retains the torque nut in the drive sleeve.
2. Remove the torque nut. If the torque nut is difficult to remove, insert a
suitable device into the drive sleeve through bore and gently tap it
loose from the handwheel end.
3. Machine the torque nut to suit the valve stem or gearbox input shaft
(see LMASS2326, MX Performance and Dimensions for maximum
stem capacity). Ensure sufficient clearance for a smooth, sliding fit.
Reassembly
1. Clean the torque nut thoroughly and lightly grease.
2. Replace the torque nut in the drive sleeve. Ensure the torque nut
meshes with the drive lugs.
3. Refit the retaining ring (B4 base) or spiral-wound ring (B4E base).
Optional B1 Base (not applicable for MX-85 or -140)
An optional torque base assembly may be added to allow for a greater
stem acceptance. This base is supplied with a fixed bore and key as
defined by ISO 5210.
Disassembly
No disassembly is required since the torque nut has been machined to
an international standard. Clean the bore and lightly grease.
B1 base

6LMENIM2312 • Accutronix MX Quick Mounting Instructions
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Limitorque Actuation Systems
Exploded view of B1 base Type “A” Bases: Thrust-only Applications
Standard A1/A1E Base
The standard MX actuator thrust base is the A1 and may be bolted
directly to the actuator. The thrust base contains a bronze alloy thrust
nut that may be machined to suit the valve stem.
An A1E thrust nut can be provided and may be installed to reach
shorter stems.
A1 base
Housing,
torque/
thrust
Pipe plug
Washer (M4)
Socket head
cap screw (M4 x 8)
Socket head set screw
Retainer, bearing
Pilot, torque/thrust
Bearing
Torque nut,
(B1)
Socket head cap
screw (M8 x 20)
Pipe plug
MX-05 B1 MX-40 B1

7Accutronix MX Quick Mounting Instructions • LMENIM2312
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Limitorque Actuation Systems
Exploded view of A1/A1E base (MX-05/10/20/40 only) Disassembly – Units MX-05/10/20/40
Refer to the figure at left.
Disassembly of the main housing from the base may be
recommended to allow the base to remain on the valve if the actuator
must be removed for service.
Pilot removal
MX-05/10: Remove the screw and washer holding the valve pilot to the
thrust base and remove pilot.
MX-20/40: Turn counterclockwise (CCW) and remove.
Thrust bearing and nut removal
1. Remove the first set of thrust washers and bearing.
2. Remove stem nut.
NOTE: The thrust washers, bearing, and stem nut may be removed at the
same time. The second set of thrust washers and bearing do not have to
be removed.
3. Machine the stem nut to suit the valve stem. Ensure sufficient
clearance to avoid unnecessary wear and heating during operation.
Housing
Socket head cap
screw
Socket head cap screw
Washer
Quad ring
Thrust washers
Pipe plug
Thrust base
standard nut
Thrust nut
Thrust washers
O-ring
Thrust
pilot
Quad ring
Needle bearings

8LMENIM2312 • Accutronix MX Quick Mounting Instructions
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Limitorque Actuation Systems
Reassembly – Units MX-05/10/20/40
Refer to the figure on page 7.
1. Clean the stem nut, washers, and bearings thoroughly.
2. Slide the second set of thrust washers and bearing in place if removed.
NOTE: Order of assembly for thrust washers and bearing must be as
follows: washer, thrust bearing, washer.
Pilot installation
MX-05/10: Slide pilot into thrust base assembly and secure with washer
and screw. Tighten fully.
MX-20/40: Place pilot into thrust base and turn clockwise (CW) until
pilot is tight.
Disassembly – Unit MX-85
Refer to the figure on page 9.
Disassembly of the main housing from the base may be
recommended to allow the base to remain on the valve if the actuator
must be removed for service.
Thrust base mounting plate removal
Remove the six socket head cap screws holding the valve mounting
plate to the thrust base housing and remove mounting plate.
Thrust bearing and nut removal
1. Remove the first set of thrust washers and bearing.
2. Remove stem nut.
NOTE: The thrust washers, bearing, and stem nut may be removed at the
same time. The second set of thrust washers and bearing do not have to
be removed.
3. Machine the stem nut to suit the valve stem. Ensure sufficient
clearance to avoid unnecessary wear and heating during operation.

9Accutronix MX Quick Mounting Instructions • LMENIM2312
Flow Control
Limitorque Actuation Systems
Exploded view of thrust base (MX-85 only) Reassembly – Unit MX-85
Refer to the figure at left.
1. Clean the stem nut, washers, and bearing(s) thoroughly.
2. Slide the second set of thrust washers and bearing in place if removed.
3. Install stem nut.
4. Install first set of thrust washers and bearing.
NOTE: Order of assembly for thrust washers and bearing must be as
follows: washer, thrust bearing, washer.
Thrust baseplate installation
Mount baseplate to thrust base housing and install the six socket head cap
screws to the proper torque per the table below.
Mechanical Installation of MX
Screw Size Torque (ft-lb)
M8 or 5 /16 inch 12-14
M10 or 3 /8inch 25-30
M12 or 1 /2inch 40-50
M16 or 5 /8inch 90-100
M20 or 3 /4inch 180-200
Section A-A
View shown
with standard nut
Section A-A
View shown
with extended nut
A
A
10-17
10-2
10-13
10-12
10-14
10-3
10-14
10-12
10-10
10-1
10-13
10-11
10-15

10 LMENIM2312 • Accutronix MX Quick Mounting Instructions
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Limitorque Actuation Systems
Exploded view of thrust base (MX-140 only) NOTE: Screw mounting torque for both mounting thrust base to main
housing and thrust baseplate to thrust base housing.
Disassembly – Unit MX-140
Refer to the figure at left.
Disassembly of the main housing from the base may be
recommended to allow the base to remain on the valve if the actuator
must be removed for service.
Pilot removal
Remove the two screws and washers holding the valve pilot to the thrust
base and remove pilot.
Thrust bearing and nut removal
1. Remove the first set of thrust washers and bearing.
2. Remove stem nut.
NOTE: The thrust washers, bearing, and stem nut may be removed at the
same time. The second set of thrust washers and bearing do not have to
be removed.
10-10
10-1
10-13
10-12
10-14
10-3
10-14
10-13
10-12
10-15
10-6 10-7
10-2
10-11
10-8
Section A-A
View shown with
standard nut
Section B-B
View shown with
extended nut A
B
B
A