Flowserve Limitorque Accutronix MX Bedienungsanleitung

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

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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

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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

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

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