Limitorque Actuation Systems
FCD LMENIM2312-00
Limitorque
®
Accutronix MX
Quick Mounting Instructions
3Accutronix MX Quick Mounting Instructions • LMENIM2312
Flow Control
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
4 LMENIM2312 • 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
6 LMENIM2312 • Accutronix MX Quick Mounting Instructions
Flow Control
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
Flow Control
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
8 LMENIM2312 • Accutronix MX Quick Mounting Instructions
Flow Control
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 5/16inch 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
Flow Control
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
11Accutronix MX Quick Mounting Instructions • LMENIM2312
Flow Control
Limitorque Actuation Systems
3. Machine the stem nut to suit the valve stem. Ensure sufficient
clearance to avoid unnecessary wear and heating during operation.
Reassembly – Unit MX-140
Refer to the figure on page 10.
1. Clean the stem nut, washers, and bearing(s) thoroughly.
2. Slide 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.
Pilot installation
Slide pilot into thrust base assembly and secure with the two washers
and screws. Tighten fully.
Type “BL” Drive: Splined-drive Applications
(Not applicable for MX-85 or -140)
Steel alloy splined nuts are provided to a standard involute spline
category for rising and rotating stem valves per customer requirements.
Disassembly and reassembly is the same as the B4 base and the torque
nut. See Type “B” Bases: Torque-only Applications section.
Mechanical Installation of MX
Actuator onto Valve or Gearbox
NOTE: Refer to LMAIM2314, MX Maintenance and Spare Parts for
more detailed instructions.
Before installing the actuator onto a valve or gearbox, check the
following to ease installation:
• Verify mounting flange is suited dimensionally to mate with the
actuator base. Ensure that it is perpendicular to the valve stem or
gearbox input shaft.
• Ensure the stem nut mates with the valve stem or input shaft. For
screwed nuts, it is advisable to run the stem nut down the entire length
of the stem to check for tightness. Keyed or splined shafts should
exhibit a smooth, sliding fit with the key installed.
12 LMENIM2312 • Accutronix MX Quick Mounting Instructions
Flow Control
Limitorque Actuation Systems
• Ensure there is adequate engagement of the stem nut with the valve
stem or input shaft when mounted. Generally, the minimum length of
engagement is 1.5 times the diameter of the stem.
• Verify mounting studs or bolts are the correct length to suit the
thickness of the mounting plate.
• Verify hardware specifications for English style: socket head cap screw
per ASTM A 574 and ANSI 18.3. Hex head cap screw per SAE J429
Grade 5.
• Verify hardware specifications for metric style: hex and socket head
cap screws per Property Class 12.9.
• Clean and lubricate the valve stem or input shaft.
• Ensure adequate lifting facilities and slings are available at the
installation site.
NOTE: Do not use the handwheel to lift the actuator.
Mounting (Type “B” Bases): Torque-only
Refer to the figures on pages 4-6.
1. Ensure the torque nut is secured inside the actuator drive sleeve with
the retaining ring.
2. Lower the actuator onto the valve or gearbox stem. Align the stem nut
key and keyway with the valve or gearbox stem key seat.
3. Verify that the actuator and valve mounting adapter flanges mate
correctly.
4. Secure the actuator to the valve mounting adapter with mounting bolts.
Removal (Type “B” Bases): Torque-only
Refer to the figures on pages 4-6.
1. Remove the bolts that secure the actuator to the valve mounting
adapter. If type B1 base is used in addition to the standard type B4
baseplate, you may leave the B1 base attached to the actuator and
remove as a unit.
2. Lift the actuator from the actuator mounting adapter.
Mounting (Type “A” Bases): Thrust-only
Refer to the figures on pages 6-8.
1. The following are two options for mounting the type “A” base
actuator:
a. If the type “A” thrust base was removed from the valve mounting
adapter, replace the thrust base onto the valve mounting adapter.
13Accutronix MX Quick Mounting Instructions • LMENIM2312
Flow Control
Limitorque Actuation Systems
Ensure the thrust base stem nut has the lugs positioned upward to
engage with the drive sleeve slots when the actuator is reinstalled.
Rotate the bronze nut while holding the base steady.
or
b. If the thrust base is installed on the valve mounting adapter,
proceed to step two.
2. Lower the actuator along the threaded valve stem and onto the valve
mounting plate. Ensure the thrust base stem nut lugs properly engage
and align with the drive sleeve slots.
3. Install the bolts to secure the actuator to the thrust base assembly.
Removal (Type “A” Bases): Thrust-only
1. Remove the bolts that secure the actuator to the thrust base
assembly.
2. Remove the type “A” thrust base by removing the bolts that secure
the actuator to the valve mounting adapter.
or
Leave the type “A” thrust base mounted to the valve mounting adapter
until ready to remount the actuator. The thrust base will maintain valve
position provided that the valve stem threads are locking.
3. Lift the complete actuator from the thrust base.
Checking the Settings
When the assembly of the actuator to the valve is complete, the actuator
position limits may be set. Please refer to LMAIM2310, Quick Start-Up
Instructions, for calibration of valve/actuator position limits.
©2006 Flowserve Corporation, Irving, Texas, USA. Flowserve and Limitorque are registered trademarks of Flowserve Corporation. FCD LMENIM2312-00
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly
selected, this Flowserve product is designed to perform its intended function safely during its useful life. However, the purchaser
or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide
variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide
specific data and warnings for all possible applications. The purchaser/user must therefore assume the ultimate responsibility for
the proper sizing and selection, installation, operation, and maintenance of Flowserve products. The purchaser/user should read
and understand the Installation and Maintenance (I & M) instructions included with the product, and train its employees and
contractors in the safe use of Flowserve products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative
purposes only and should not be considered certified or as a guarantee of satisfactory results by reliance thereon. Nothing
contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this
product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and
information contained herein are subject to change without notice. Should any question arise concerning these provisions, the
purchaser/user should contact Flowserve Corporation at any one of its worldwide operations or offices.
FLOWSERVE CORPORATION
FLOW CONTROL DIVISION
Limitorque Actuation Systems
5114 Woodall Road
P.O. Box 11318
Lynchburg, VA 24506-1318
Phone: 434 528 4400
Facsimile: 434 845 9736
www.flowserve.com
For more information about Flowserve Corporation, visit www.flowserve.com or call USA 1 800 225 6989.
USA
Flowserve Limitorque
5114 Woodall Road
Lynchburg, VA 24506
Phone: 434-528-4400
Fax: 434-845-9736
China
Limitorque Asia - Beijing
Room B803
Han Wei Plaza
No. 7 Guang Hua Road,
Chao Yang District
Beijing 100004, P.R. China
Phone: 8610 6561 2701
FAX: 8610 6561 2702
Singapore
Limitorque Asia PTD
12, Tuas Avenue 20
Singapore 638824
Phone: 065 6862 3332
Fax: 065 6862 4940
Canada
Flowserve Flow Control
120 Vinyl Court
Woodbridge, Ontario
L4L 4A3
Canada
Phone: 905 856 8568
Fax: 905 856 7905
EMA
Limitorque EMA
Abex Road
Newbury, Berkshire
RG14 5EY
United Kingdom
Phone: 44 1635 46999
Fax: 44 1635 36034
Japan
Nippon Gear Co., Ltd
Asahi Seimei Building
9th Floor
1-11-11 Kita-Saiwai
Nishi-Ku
Yokohama-Shi,
Japan 220-0004
Phone: 81 45 326 2065
Fax: 81 45 320 5962
Flow Control
Limitorque Actuation Systems
Printed in USA.
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