Limitorque SMB Series Instruction Manual

Limitorque®
SMB Series/SB Series
Installation and Maintenance
Limitorque Actuation Systems
140-11000
July 2003

SMB/SB Installation and Maintenance Manual 140-11000 • July 2003II
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Limitorque Actuation Systems
SMB/SB Series Installation and Maintenance Manual
©2003 Copyright Limitorque. All rights reserved.
Printed in the United States of America.
Disclaimer
No part of this book shall be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or
otherwise without the written permission of Limitorque. While every precaution has been taken in the preparation of this book, the publisher assumes no
responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein.
This document is the proprietary information of Limitorque, furnished for customer use ONLY. No other uses are authorized without written permission
from Limitorque.
Limitorque reserves the right to make changes, without notice, to this document and the products it describes. Limitorque shall not be liable for technical or
editorial errors or omissions made herein; nor for incidental or consequential damages resulting from the furnishing, performance, or use of this document.
This manual contains information that is correct to the best of Limitorque’s knowledge. It is intended to be a guide and should not be considered as a sole
source of technical instruction, replacing good technical judgment, since all possible situations cannot be anticipated. If there is any doubt as to exact
installation, configuration, and/or use, call Limitorque at [phone].
The choice of system components is the responsibility of the buyer, and how they are used cannot be the liability of Limitorque. However, Limitorque’s
sales team and application engineers are always available to assist you in making your decision. The latest revisions to this document are available online at
http://www.limitorque.com.

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Table of Contents Page #
1 Introduction 1-1
1.1 Purpose 1-1
1.2 User Safety 1-1
2 Product Capabilities and Features 2-1
2.1 Initial Inspection and Storage Instructions 2-1
2.2 Product Identification 2-1
2.3 Inspection and Recording 2-2
2.4 Storage Procedure 2-2
3 Actuator Weights 3-1
4 Installation Instructions 4-1
4.1 Safety Precautions 4-1
4.2 Safety Practices 4-1
4.3 Prepare Initial Actuator 4-2
4.3.1 Mounting Base 4-2
4.3.2 Stem Acceptance 4-2
4.4 Setting Limit Switch 4-3
4.4.1 Two-Train Geared Limit Switch 4-3
4.4.2 Four-Train Geared Limit Switch 4-6
4.5 Setting Torque Switch 4-8
4.5.1 SMB-000 Double Torque Switch 4-8
4.5.2 SMB-00 Double Torque Switch 4-11
4.5.3 SMB-0 through SMB-5 Double Torque Switch 4-13
4.6 Position Indication 4-15
4.6.1 Local Position Indicator 4-15
4.6.2 Remote Position Indicator (50 ohm or 1000 ohm Potentiometer) 4-15
4.6.3 Remote Position Indicator (Resistance-to-Current Signal Converter) 4-15
4.7 Additional Electrical Components 4-17
4.7.1 Reversing Starter 4-17
4.7.2 Overload Relays 4-17
4.7.3 Control Station 4-18
5 Operation 5-1
5.1 Motor Operation 5-1
5.2 Manual Operation 5-2
6 Maintenance 6-1
6.1 Routine Maintenance 6-1
6.2 Major Maintenance 6-1
6.3 Lubrication 6-2
6.3.1 Lubrication Inspection 6-2
6.3.2 Standard Lubricants 6-2
6.3.3 Minimum Lubricant Qualities Required 6-3

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7 SMB Disassembly & Reassembly 7-1
7.1 SMB-000 7-1
7.1.1 SMB-000 Disassembly 7-1
7.1.2 SMB-000 Reassembly 7-2
7.1.3 To Replace Stem Nut Only 7-2
7.1.4 Gasket Instructions 7-3
7.2 SMB-00 7-9
7.2.1 SMB-00 Disassembly 7-9
7.2.2 SMB-00 Reassembly 7-10
7.2.3 To Replace Stem Nut Only 7-10
7.2.4 Gasket Instructions 7-11
7.3 SMB-0, 1, 2, 3, 4, 4T 7-19
7.3.1 SMB-0, 1, 2, 3, 4, 4T Disassembly 7-19
7.3.2 SMB-0, 1, 2, 3, 4, 4T Reassembly 7-20
7.3.3 To Replace Stem Nut Only 7-21
7.3.4 Gasket Instructions 7-21
7.4 SMB-5 (Thrust and Torque) and SMB-5T (Torque Only) 7-28
7.4.1 SMB-5 and SMB-5T Disassembly 7-28
7.4.2 SMB-5 and SMB-5T Reassembly 7-30
8 SB Disassembly and Reassembly 8-1
8.1 SB-00 8-1
8.1.1 SB-00 Disassembly/Stem Nut Removal 8-1
8.1.2 SB-00 Reassembly/Stem Nut Installation 8-2
8.2 SB-0 8-5
8.2.1 SB-0 Disassembly/Stem Nut Removal 8-5
8.2.2 SB-0 Reassembly/Stem Nut Installation 8-5
8.3 SB-1 8-8
8.3.1 SB-1 Disassembly/Stem Nut Removal 8-8
8.3.2 SB-1 Reassembly/Stem Nut Installation 8-8
8.4 SB-2 8-11
8.4.1 SB-2 Disassembly/Stem Nut Removal 8-11
8.4.2 SB-2 Reassembly/Stem Nut Installation 8-12
8.5 SB-3 8-15
8.5.1 SB-3 Disassembly/Stem Nut Removal 8-15
8.5.2 SB-3 Reassembly/Stem Nut Installation 8-15
8.6 SB-4 8-18
8.6.1 SB-4 Disassembly/Stem Nut Removal 8-18
8.6.2 SB-4 Reassembly/Stem Nut Installation 8-18
9 Troubleshooting 9-1
10 How to Order Parts 10-1
11 Regulatory Information 11-1
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Figures
Figure 2.1 – Typical SMB 2-2
Figure 4.1 – Two-Train Geared Limit Switch–Rotor-Type 4-4
Figure 4.2 – Four-Train Geared Limit Switch–Rotor-Type 4-6
Figure 4.3 – SMB-000 Double Torque Switch 4-9
Figure 4.4 – SMB-00 Double Torque Switch 4-11
Figure 4.5 – SMB-0 Through -5 Double Torque Switch 4-13
Figure 4.6 – Typical Connection for a 50-ohm Potentiometer 4-16
Figure 4.7 – Typical Connection for 1000-ohm Potentiometer 4-16
Figure 4.8 – Typical Connection for Older Version R/I Converter 4-17
Figure 4.9 – Typical Connection for PT20SD R/I Converter 4-17
Figure 4.10 – Typical Wiring Diagram—Built-in Reversing Starter and Control
Station for a Three-Phase Power Supply 4-18
Figure 7.1 – SMB-000 Parts Diagram- Side View 7-4
Figure 7.2 – SMB-000 Parts Diagram - Top View 7-5
Figure 7.3 – SMB-000 Exploded View 7-6
Figure 7.4 – SMB-00 Parts Diagram – Motor End View 7-12
Figure 7.5 – SMB-00 Parts Diagram – Top View 7-13
Figure 7.6 – SMB-00 Parts Diagram – Side View 7-14
Figure 7.7 – SMB-00 Parts Diagram – Side Mounted Handwheel Detail 7-15
Figure 7.8 – SMB-00 Exploded View 7-16
Figure 7.9 – SMB-0 through SMB-4 and 4T Parts Diagram – Top View 7-22
Figure 7.10 – SMB-0 through SMB-4 and 4T Parts Diagram – Worm Shaft Side View 7-23
Figure 7.11 – SMB-0 through SMB-4 and 4T Parts Diagram – Drive Sleeve Side View 7-24
Figure 7.12 – SMB-0 through SMB-4 and 4T Exploded View 7-25
Figure 7.13 – SMB-5 and 5T Parts Diagram 7-34
Figure 7.14 – SMB-5 and 5T - Top View 7-35
Figure 7.15 – SMB-5 and 5T Declutch Housing Detail 7-36
Figure 7.16 – SMB-5 and 5T Exploded View 7-37
Figure 8.1 – SB-00 Parts Diagram 8-3
Figure 8.2 – SB-0 Parts Diagram 8-6
Figure 8.3 – SB-1 Parts Diagram 8-9
Figure 8.4 – SB-2 Parts Diagram 8-13
Figure 8.5 – SB-3 Parts Diagram 8-16
Figure 8.6 – SB-4 Parts Diagram 8-19
Tables Table 3.1 – Actuator Weights 3-1
Table 4.1 – Mounting Base Dimensions 4-2
Table 4.2 – Maximum Stem Acceptance 4-2
Table 4.3 – Two-Train Geared Limit Switch–Parts List 4-5
Table 4.4 – Four-Train Geared Limit Switch–Parts List 4-7
Table 4.5 – SMB-000 Double Torque Switch Parts List 4-10
Table 4.6 – SMB-00 Torque Switch Parts List 4-12
Table 4.7 – SMB-0 through SMB-5 Double Torque Switch Parts List 4-14
Table 6.1 – Approximate Volumes and Weights of Lubricants 6-3
Table 7.1 – SMB-000 Parts List 7-7
Table 7.2 – SMB-00 Parts List 7-17
Table 7.3 – SMB-0 through SMB-4 and 4T Parts List 7-26
Table 7.4 – SMB-5 and 5T Parts List 7-38
Table 8.1 – SB-00 Parts List 8-4
Table 8.2 – SB-0 Parts List 8-7
Table 8.3 – SB-1 Parts List 8-10
Table 8.4 – SB-2 Parts List 8-14
Table 8.5 – SB-3 Parts List 8-17
Table 8.6 – SB-4 Parts List 8-20
Table 10.1 – Space Heater Size per Voltage Rating 10-1
Page #

SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
1Introduction
1.1 Purpose
This Installation and Maintenance Manual explains how to install and maintain SMB and SB actuators. Information on installation,
operation, disassembly, lubrication, and spare parts is provided.
1.2 User Safety
Safety notices in this manual detail precautions the user must take to reduce the risk of personal injury and damage to the equipment.
The user must read and be familiar with these instructions before attempting installation, operation, or maintenance. Failure to observe
these precautions could result in serious bodily injury, damage to the equipment, void of the warranty, or operational difficulty.
Safety notices are presented in this manual in three forms:
aaWARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning notices could result in
personal injury or death.
CAUTION: Directs the user’s attention to general precautions that, if not followed, could result in personal injury and/or
equipment damage.
NOTE: Highlights information critical to the user’s understanding of actuator installation and operation.
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SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
2Product Capabilities and Features
SMB and SB Series actuators easily operate all types of valves: gate, globe, plug, ball, and butterfly valves, and specialized valves and
mechanisms.
The actuators meet rigid safety requirements. The housing is durable cast-iron, acceptable for use in the nuclear power industry as
well as other industries.
The actuators are available with optional integral controls and other features.
The actuators have a removable stem nut that allows transferring of the actuator from one valve to another without major
disassembly.
2.1 Initial Inspection and Storage Instructions
aaWARNING: Read this Installation and Maintenance Manual carefully and completely before attempting to install, operate,
disassemble, or troubleshoot the actuator. Be aware of the electrical hazards.
2.2 Product Identification
The actuator unit nameplate is located on the back of the unit opposite the limit switch compartment. The nameplate contains the
following information:
• Point of Manufacture
• Unit Size
• Order Number
• Serial Number
• Customer Tagging
• CE Stamp
The motor nameplate is located on the motor. The nameplate contains the following information:
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• ID Number
• Run Torque
• RPM
• Full Load Amps
• Insulation Class
• Horsepower
• Service Factor
• Hertz
• Ambient Temperature
• Start Torque
• Enclosure Type
• Volts
• Locked Rotor Amps
• Duty
• Phase
• Motor Code
• Connection Diagram

SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
Figure 2.1 – Typical SMB (0 through 4)
2.3 Inspection and Recording
Upon receipt of the actuator:
1. Carefully remove the actuator from the shipping carton or skid. Thoroughly examine the equipment for any physical damage that
may have occurred during shipment. If damaged, immediately report the damage to the transport company.
2. A nameplate is attached to each actuator. Record this information for future reference, i.e. ordering parts or obtaining further
information.
2.4 Storage Procedure
NOTE: The following is our recommended storage procedure to retain maximum product integrity during storage. Failure to comply
with recommended procedures will void the warranty. For longer-term storage, contact Limitorque for procedures and
recommendations.
Storage (less than 1 year)
Actuators are not weatherproof until properly installed on the valve or prepared for storage.
Store actuators in a clean, dry, protected warehouse, away from excessive vibration and rapid temperature changes. If the actuators
must be stored outside, they must be stored off the ground, high enough to prevent them from being immersed in water or buried by
snow.
1. Position the actuator in storage with motor and switch compartment horizontal.
2. Connect the internal heaters (if supplied) or place desiccant in the switch compartment.
3. Replace all plastic caps or plugs with metal pipe plugs and ensure that all cover bolts are tight.
4. If the actuator is mounted on a valve and the stem protrudes from the actuator, a suitable stem cover must be provided.
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D
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SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
3Actuator Weights
The approximate weights of the SMB actuators and SB and SBD options are provided below:
Table 3.1 – Actuator Weights1
Actuator Weight1Adder for SB Adder for SBD
lb. kg lb. kg lb. kg
SMB-000 135 62 N/A N/A N/A N/A
SMB-00 200 90 65 30 100 46
SMB-0 350 159 180 83 210 97
SMB-1 460 209 200 92 325 150
SMB-2 580 263 220 101 345 159
SMB-3 1200 553 500 230 825 380
SMB-4&4T 2020 916 795 366 1285 591
SMB-5&5T 3375 1531 N/A N/A N/A N/A
SMB-5XT 5875 2665 N/A N/A N/A N/A
NOTE 1: With the largest motor, no integral controls, and standard compartment cover.
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SMB/SB Installation and Maintenance Manual 140-11000 • July 2003
4Installation Instructions
4.1 Safety Precautions
aWARNING: Read this Installation and Maintenance Manual carefully and completely before attempting to install,
operate, or troubleshoot the Limitorque actuator.
a WARNING: Be aware of electrical hazards. Turn off incoming power before working on the actuator and before
opening the switch compartment.
a WARNING: Potential HIGH PRESSURE vessel — be aware of high-pressure hazards associated with the attached
valve or other actuated device when installing or performing maintenance on the actuator. Do not remove the
actuator mounting bolts when the actuator is mounted on a rising stem valve unless the valve is in the fully open
position and there is no pressure in the line.
a WARNING: Do not attempt to remove the spring cartridge cap, housing cover, or stem nut locknut from the
actuator while the valve or actuated device is under load.
a WARNING: Do not manually operate the actuator with devices other than the installed handwheel and declutch
lever. Using force beyond the ratings of the actuator and/or using additive force devices such as cheater bars,
wheel wrenches, pipe wrenches, or other devices on the actuator handwheel or declutch lever may cause serious
personal injury and/or damage to the actuator valve.
a WARNING: Do not exceed any design limitations or make modifications to this equipment without first
consulting Limitorque.
a WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring must be
wired and checked for proper operation by a qualified tradesman.
a WARNING: For maintenance and/or disassembly of the actuator while installed on the valve, ensure that the
actuator is not under thrust or torque load. If the valve must be left in service, the valve stem must be locked in
such a way as to prevent any movement of the valve stem.
CAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the overload.
CAUTION: Do not operate the valve under motor operation without first setting or checking the limit switch setting
and motor direction.
CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to this position
automatically when the motor is energized.
CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
4.2 Safety Practices
The following check points should be performed to maintain safe operation of the SMB or SB actuator:
• Mount the actuator with the motor in a horizontal plane, if possible.
• Keep the switch compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up a periodic operating schedule for infrequently used valves.
• Verify all actuator wiring is in accordance with the applicable wiring diagram.
• Carefully check for correct motor rotation direction. If the valve closes when open button is pushed,
the motor leads may have to be reversed.
• Verify the stem nut is secured tightly by the locknut and that the top thread of the locknut is crimped
or staked in two places.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on
rising stem valves.
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SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 4-2
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4.3 Prepare Initial Actuator
Replace all molded plastic conduit and top protectors (installed for shipping purposes only) with metal pipe plugs when
installation wiring is complete.
4.3.1 Mounting Base
Table 4.1 – Mounting Base Dimensions
Mounting Holes Tap Dimensions
Actuator Quantity MSS ISO
SMB-000 4 5/16-18 UNC x .63” deep N/A
SMB-00 4 5/8-11 UNC x 1.13” deep M16-2 x 29 mm deep
SMB-0 4 3/4-10 UNC x 1.00” deep M20-2.5 x 26 mm deep
SMB-1 8 5/8-11 UNC x 1.00” deep M16-2 x 26 mm deep
SMB-2 8 3/4-10 UNC x 1.13” deep M20-2.5 x 29 mm deep
SMB-3 8 7/8-9 UNC x 1.75” deep M30-3.5 x 45 mm deep
SMB-4 8 1-1/4-7 UNC x 2.00” deep M36-4 x 64 mm deep
SMB-4T 8 3/4-10 UNC x 1.63” deep M20-2.5 x 42 mm deep
SMB-5 12 1-1/2-6 UNC x 3.00” deep N/A
SMB-5T 16 1-8 UNC x 2.00” deep N/A
SMB-5XT 16 1-1/16 dia thru holes N/A
4.3.2 Stem Acceptance
Table 4.2 – Maximum Stem Acceptance
Maximum Stem Acceptance
Two-piece nut design (drive sleeve & stem nut)
Max threaded Max bore & keyway
Actuator inch mm inch mm
SMB-000 1.375 35 1.125 w/ 1/4x3/32 26.0 w/ 8x3.5
SMB-00 1.75 44 1.500 w/ 3/8x1/837.0 w/ 10x4
SMB-0 2.375 60 1.875 w/ 1/2x3/16 48.0 w/ 14x4.5
SMB-1 2.875 73 2.438 w/ 5/8x7/32 62.0 w/ 18x5.5
SMB-2 3.5 89 2.875 w/ 3/4x1/473.0 w/ 20x6
SMB-3 5 127 4.250 w/ 1.0x3/8108.0 w/ 28x8
SMB-4 5 127 4.500 w/ 1.0x1/2114.0 w/ 32x9
SMB-4T N/A N/A 7.000 w/ 1-3/4x5/8146.0 w/ 36x10
SMB-5 6.25 159 5.250 w/ 1-1/4x7/16 133.0 w/ 36x10
SMB-5T N/A N/A 8.000 w/ 2x3/4152.0 w/ 40x11
SMB-5XT N/A N/A 10.000 w/ 1-1/4x5/8N/A
SB-00 1.25 32
SB-0 2.375 60
SB-1 2.625 66
SB-2 3.50 89
SB-3 4.00 102
SB-4 5.00 127

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4.4 Setting The Limit Switch
aWARNING: Disconnect all incoming power before opening or replacing the limit switch compartment cover.
CAUTION: When wiring control circuits, distinguish between “normally open” and “normally closed” terminals on the geared
limit switch.
CAUTION: Do NOT attempt to repair the limit switch gear box. Replace entire limit switch gear box.
CAUTION: Do NOT use abrasive cloth to clean the silver contacts on the limit switch. Contacts should be burnished.
CAUTION: Before motor operation, reset the geared limit switch if the actuator has been dismantled or removed from the valve.
NOTE: Clean the limit switch cover thoroughly and apply a thin coat of grease on machined flange surfaces before mounting on an
explosionproof actuator.
4.4.1 Two-Train Geared Limit Switch
The rotor-type, two-train geared limit switch employs two rotary drum switches. Each rotary drum switch contains four contacts.
When the rotor is properly set to trip at the desired position, two of these contacts open electric circuits and two of the contacts close
electric circuits. One rotor is normally set to trip at the full open position of the valve, and the other rotor is normally set to trip at the
full close position of the valve.
Each drum switch may be adjusted independently of the other:
• First Drum Switch—one circuit is used to open the “open” holding coil circuit of the motor controller, one circuit is used to
control the “open” indicating light.
• Second Drum Switch—one circuit is used to open the “close” holding coil circuit of the motor controller, one circuit is used to
control the “closed” indicating light.
For the geared limit switches to trip at any desired position, follow the setting procedure below.
Piece numbers refer to Figure 4.1 and Table 4.3.
1. Verify all power is OFF.
2. Using the handwheel, manually open the valve to the full open position. See Section 5.2 Manual Operation. Note the direction of
rotation of the Intermittent Gear Shaft (piece #42), located over the Rotor (piece #49) to be set.
3. Using a screwdriver, turn the Set Rod (piece #48) clockwise until it reaches a stop position.
4. If the Rotor (piece #49) you are setting has not turned 90˚ to open the contacts that should trip open at this position, insert
screwdriver on the Intermittent Gear Shaft (piece #42). Turn in the direction noted in Step No. 4 until the Rotor (piece #49) turns
and opens the contacts to be set.
5. If the Rotor (piece #49) has turned so that the contacts are already open, turn the Intermittent Gear Shaft (piece #42) in the
opposite direction as previously noted in Step No. 4 until the contacts close. Turn the Intermittent Gear Shaft (piece #42) slightly
in the direction noted in Step No. 4 until the contacts open. The Rotor (piece #49) is set at the correct position for contact
opening.
6. Back off the Set Rod (piece #48) until it stops. Place the screwdriver on the Intermittent Gear Shaft (piece #42) to ensure that the
shaft is tight and will not rotate. Do not force.
7. Close the valve completely. Repeat Step No. 1 through 6 to set the tripping position for the other Rotor (piece #49).

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Figure 4.1 – Two-Train Geared Limit Switch – Rotor-Type
911 6 8 7 55 4 58 45 48 53 54
61
49
50415147434644521
51032
68
69
64 66 67
65
63
62
56
63
42
01-472-0006-3

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Table 4.3 – Two-Train Geared Limit Switch – Parts List
Piece Quantity320-2 Description 42
11 Cartridge
21 Drive Sleeve and Shaft
31 Drive Pinion
41 Drive Pinion (Secondary)
51 Declutch Spring
62 Bushing
71 O-Ring
81 Pin
91 Groove Pin (1/8"x1" Long)
10 1 Washer
11 1 Oil Seal
41 1 Gear Frame
42 2 Intermittent Gear Shaft
43 2 Intermittent Pinion Shaft
44 2 Geared Limit Frame Cover
45 8 Intermittent Gear
46 6 Intermittent Pinion
47 2 Stem Spur Pinion
48 1 Set Rod
49 2 Rotor
50 2 Groove Pin (3/32"x3/4" Long)
51 2 Cover Gasket
52 8 #6-32 x 1/4" Long Fillet Head Machine Screw
53 1 O-Ring #1820-3
54 1 Setting Rod Bushing
55 1 Gear Frame Gasket
56 8 Insert (Rotor)
57 2 O-Ring (For Intermittent Gear Shaft piece #42) (Not shown)
58 2 Groove Pin (1/8"x1" Long)
61 1 Finger Base
62 8 Right Hand Finger Assembly
63 8 Left Hand Finger Assembly
64 16 #10-32 x 1" Long Hex Head Machine Screw
65 32 #10 Lockwasher
66 32 #10-32 Hex Nut
67 24 #10 Washer
68 2 #1/4-20 x 7/8" Long Fillet Head Cap Screw
69 2 1/4" Internal Tooth Lockwasher

01-472-0007-3
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4.4.2 Four-Train Geared Limit Switch
The rotor-type, four-train geared limit switch employs four rotary drum switches. Each rotary drum switch contains four contacts.
When the rotor is properly set to trip at the desired position, two of these contacts open electric circuits and two of the contacts close
electric circuits. One rotor is set to trip at the full open position of the valve, and one rotor is set to trip at the full close position of the
valve. The other two rotors are set at some intermediate position depending on the application.
For the geared limit switches to trip at any desired position, follow the steps in Section 4.4.1, Two-Train Geared Limit Switch, with
the exception that the piece numbers refer to Figure 4.2 and Table 4.4.
NOTE: The upper Set Rod (piece #48) allows adjustment of the two adjacent upper rotors, and the lower Set Rod (piece #48) allows
adjustment of the two adjacent lower rotors.
Figure 4.2 – Four-Train Geared Limit Switch – Rotor-Type
6148
54
41
53
43
46
51
2930
27
2834
35212625
22 23 26 24 31 32 55 52 44 58 45 42 57 47 50 4968
69
65
64
63
67 66
56
62
63

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Table 4.4 – Four-Train Geared Limit Switch–Parts List
Piece Quantity320-2 Description 42
21 1 Cartridge
22 2 Oilite Bushing
23 1 Drive Shaft
24 1 Drive Pinion (Internal)
25 1 Helical Pinion
26 2 Groove Pin (1/8” x 1" Long)
27 2 Drive Sleeve and Gear
28 2 Declutch Spring
29 2 Drive Pinion Spur
30 2 Pin (1/2” x11/16”Long)
31 1 Cartridge Gasket
32 1 Cartridge Mounting Plate
33 4 #1/4-20 x 5/8”Long Socket Head Cap Screw and Lockwasher
34 1 O-Ring #6227-11
35 1 O-Ring #6227-11
36 4 #5/8”-18 x 5/8" Fillet Head Cap Screw and Lockwasher
41 2 Gear Frame
42 4 Intermittent Gear Shaft
43 4 Intermittent Pinion Shaft
44 4 Geared Limit Frame Cover
45 16 Intermittent Gear
46 12 Intermittent Pinion
47 4 Stem Spur Pinion
48 2 Set Rod
49 4 Rotor
50 4 Groove Pin (3/32”x3/4" Long)
51 4 Cover Gasket
52 16 #6-32 x 1/4”Long Fillet Head Machine Screw
53 2 O-Ring #1820-3
54 2 Setting Rod Bushing
55 2 Gear Frame Gasket
56 16 Insert (Rotor)
57 2 O-Ring #1820-5
58 2 Groove Pin (1/8” x 1" Long)
61 2 Finger Base
62 16 Right Hand Finger Assembly
63 16 Left Hand Finger Assembly
64 32 #10-32 x 1" Long Hex Head Cap Screw
65 64 #10 Lockwasher
66 64 #10-32 Hex Nut
67 48 #10 Washer
68 4 #1/4-20 x 7/8”Long Fillet Head Cap Screw
69 4 1/4" Internal Tooth Lockwasher

SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 4-8
Flow Control Division
Limitorque Actuation Systems
4.5 Setting Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
aWARNING: Disconnect all incoming power before working on the torque switch.
aWARNING: Do not attempt to remove either the spring cartridge cap or the housing cover from the actuator
while the valve is torque-seated.
CAUTION: Do not use abrasive cloth to clean the contacts on the torque switch.
CAUTION: A maximum stop setting plate is furnished on all actuators. Do not exceed this maximum setting without consulting
Limitorque.
4.5.1 SMB-000 Double Torque Switch
NOTE: Torque settings must be made with the switch mounted in the actuator.
Piece numbers correspond to Figure 4.3 and Table 4.5.
To set the torque switch:
1. Verify all electric power is OFF.
2. Loosen Pan Head Screws (piece #30).
3. For open or close operation, set Striker (piece #25) to the required torque setting. Match the edge of the Striker with the desired
number. The higher the number, the higher the torque output of the actuator.
4. Tighten Pan Head Screws (piece #30).
5. For torque seated valves, operate the valve electrically to seat the valve. Ensure tight shut-off by tripping the torque switch
contacts.

SMB/SB Installation and Maintenance Manual 140-11000 • July 20034-9
Flow Control Division
Limitorque Actuation Systems
Figure 4.3 – SMB-000 Double Torque Switch
01-474-0056-4
1
2
3
4
5
1
2
3
4
5
ARM PC-33
SECTION A-A
30˚
29˚ REF.
C
L
B
B
A
A
27 24 25 26 25 23 22 21 43 20
28 29
30 32 31 25 22 20 17 1 16 18 33 34 35
27 25 23 21 3 2 19 37 36
44
P
P
3839
91211105648 1437
7
15
13
45
2
VIEW B-B
42
42

SMB/SB Installation and Maintenance Manual 140-11000 • July 2003 4-10
Flow Control Division
Limitorque Actuation Systems
Table 4.5 – SMB-000 Double Torque Switch Parts List
Piece Quantity320-2 Description 42
11Terminal Block
24Contact Block
34Contact Screw
44Finger Holder
54Finger
64Shunt
74Shunt Washer (1/4”O.D. x 3/32”I.D. x 1/32”Thick)
84Rivet
94Finger Spring Stud
10 4 Compression Spring
11 8 Spring Cup Washer
12 4 Cotter Pin (3/64”x1/4”)
13 4 Hex Head Machine Screw (#10-32 x 3/8”)
14 4 Ring Tongue Connector 18" (#16 AWG Type TU Pigtail)
15 4 Shakeproof Lockwasher, Internal Teeth
16 1 Torque Switch Mounting Bracket
17 1 O-Ring
18 1 O-Ring
19 2 Socket Head Cap Screw (1/4-20 x 1/2”Long)
20 1 Cam
21 1 Torsion Spring
22 1 Spring Mandrel
23 1 Dial
24 1 Shaft
25 2 Striker
26 1 Torque Limiting Plate
27 1 Striker Hub
28 1 Roll Pin (1/16”x 1/2”)
29 1 #4 Swage Nut
30 2 Pan Head Screw (#8-32 x 5/16”Long, Slotted)
31 2 Shakeproof Lockwasher, External Teeth
32 2 Flatwasher (11/64”I.D. x 5/16”O.D. x .032” Thick)
33 1 Arm
34 1 Roller
35 1 Roller Pin
36 1 Groove Pin (3/32”diameter x 3/32”)
37 1 Arc Barrier
38 1 Pan Head Screw #4-40 x 1/4”
39 1 Lockwasher, External Tooth
42 2 Spring Pin
43 1 Cam Insert
44 2 Bushing (For piece #16)
45 4 Washer

SMB/SB Installation and Maintenance Manual 140-11000 • July 20034-11
Flow Control Division
Limitorque Actuation Systems
4.5.2 SMB-00 Double Torque Switch
NOTE: Torque settings must be made with the switch mounted in the actuator.
Piece numbers correspond to Figure 4.4 and Table 4.6.
To set the torque switch:
1. Verify all electric power is OFF.
2. For the open or close direction torque switch, loosen Machine Screw (piece #35) and set Pointer (piece #7) at the desired torque
setting. The higher the number, the higher the torque output of the actuator.
3. Tighten Machine Screw (piece #35).
4. For torque seated valves, operate the valve electrically to seat the valve. Ensure tight shut-off by tripping the torque switch
contacts.
Figure 4.4 – SMB-00 Double Torque Switch
3
4
3
2
1
2
5
1
41 18
37
33
17
4
27
2
1314344
9
6
36
27
27
39 29 16 42 47
3
45
20
25
12
2122101528
7
39
35
11
46
5
25
23 814
13
30
34
25
01-473-0056-3