USER INSTRUCTIONS
Limitorque
For L120-10 through L120-40
FCD LMENIM1201-05-A4 – 03/18
®
Actuation Systems L120 Series
Installation
Operation
Maintenance
Experience In Motion
Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
Contents
1 Introduction 4
1.1 Purpose 4
1.2 User Safety 4
2 Product Inspection - Storage - Identification 5
2.1 Inspection and Recording 5
2.2 Short-Term Storage (less than 1 year) 5
2.3 Product Identification 7
3 Actuator Weights 8
4 Installation Instructions 9
4.1 Safety Precautions 9
4.2 Safety Practices 10
4.3 Initial Actuator Preparation 10
4.3.1 Mounting Base 10
4.3.2 Stem Acceptance 10
4.4 Torque Switch 11
4.4.1 Setting Torque Switch 11
4.4.2 Balancing Torque Switch 12
4.5 Geared Limit Switch 12
4.5.1 Setting Limit Switch 12
4.5.2 Setting Procedure (Refer to Figure 4.2) 13
4.5.3 Combination of Contacts (Refer to Figure 4.2) 14
4.6 Position Indication 14
4.6.1 Local position indication 14
4.6.2 Remote Position Indication 15
4.7 Optional Side-Mounted Handwheel 16
5 Operation 19
5.1 Electrical Start-up 19
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
5.2 Manual Operation 20
5.3 Motor Operation 25
5.4 Torque and Travel Limiting 25
6 Maintenance 26
6.1 Lubrication 26
6.1.1 Lubrication Inspection 26
6.1.2 Factory Lubricant 27
6.2 Minimum Lubricant Qualities Required 27
6.3 Disassembly and Reassembly 28
6.4 Disassembly of the L120-10, 20, and 40 28
6.5 Drive Sleeve and Housing Cover Disassembly 29
6.6 Torque Nut Disassembly (Drive 1 Option) 29
6.7 Thrust Base Disassembly (Drive 2 Option) 30
6.8 Stem Nut Replacement – Thrust Base Applications 30
6.9 Reassembly 31
6.9.1 Declutch Assembly (L120-10) 32
6.9.2 Declutch Assembly (L120-20/40) (Refer to Figure 6.3) 32
6.9.3 Install the Motor (Refer to Figure 5.2) 33
6.9.4 Lubrication Procedure 33
6.9.5 Install Geared Limit Switch, Torque Switch and Finish Assembly 33
7 How to Order Parts 34
8 EC Declaration of Conformity 35
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
Introduction
Flowserve Limitorque actuators are available with a wide range of standard and optional features. Be
aware of these features and their role in the setup and operation of the actuator.
1.1 Purpose
This Installation and Maintenance Manual explains how to install and maintain the L120-10, L120-20,
and L120-40 actuators. Information on installation, disassembly, reassembly, lubrication, and 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. Work to be performed on the actuator should be
carried out by a qualified tradesman familiar with the operation and maintenance of electric actuators.
Failure to observe these precautions could result in serious bodily injury or death, damage to the equipment, voiding of the warranty, or operational difficulty.
Safety notices are presented in this manual in three forms:
c WARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning
notices could result in personal injury or death.
a CAUTION: Directs the user’s attention to general precautions that, if not followed, could result in
personal injury and/or equipment damage.
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NOTE: Highlights information critical to the user’s understanding of the actuator’s installation and
operation.
Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
Product Inspection - Storage -
2
c WARNING: Read this Installation and Maintenance Manual carefully and completely before
attempting to install the actuator. Be aware of the electrical hazards.
Identification
2.1 Inspection and Recording
Upon receipt of the actuator, inspect the condition of the equipment and record nameplate
information:
1. Carefully remove actuator from 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. Record the actuator nameplate information for future reference; i.e. ordering parts,
obtaining further information.
2.2 Short Term Storage Procedures (less than 1 year)
NOTE: The following are our recommended storage procedures to retain maximum product integrity
during short-term storage. Failure to comply with recommended procedures will void the warranty. For
longer-term storage, contact Limitorque for procedures and recommendations.
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 pipe plugs and ensure that all covers are tight.
4. If the actuator is mounted on a valve and the stem protrudes from the unit, a suitable stem cover
must be provided.
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
Figure 2.1 – L120-10 through 40
Handwheel
Limit Switch/
Controls
Compartment
Motor
Housing
Actuator
Nameplate
(hidden)
Declutch
Lever
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
2.3 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:
• Limitorque name
• 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:
• ID Number
• Start Torque
• Run Torque
• Enclosure Type
• RPM
• Volts
• Full Load Amps
• Locked Rotor Amps
• Insulation Class
• Duty
• Horsepower
• Service Factor
• Phase
• Cycles
• Motor Code
• Ambient Temperature
• Connection Diagram
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
Actuator Weights
The approximate L120 actuator weights are provided below:
Table 3.1 – Actuator weights
Actuator
L120-10
L120-20
L120-40
Note: Approximate weights are based on standard explosion-proof construction, with the largest
three-phase motor available for the model size.
Control Types
Size
NCU 100 45 112 51 107 49 119 54
BIC 115 52 127 58 122 55 134 61
CLAMSHELL 140 64 152 69 147 67 159 72
NCU 140 64 158 72 153 69 171 78
BIC 155 70 173 78 168 76 186 84
CLAMSHELL 180 82 198 90 193 88 211 96
NCU 190 86 216 98 212 96 238 108
BIC 205 93 231 105 227 103 253 115
CLAMSHELL 230 105 256 116 252 114 278 126
Drive 1 Weight (lb./kg) Drive 2 Weight (lb./kg)
Top HW Side HW Top HW Side HW
lb. kg lb. kg lb. kg lb. kg
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
Installation Instructions
4.1 Safety Precautions
c WARNING: Read this Installation and Maintenance Manual carefully and completely before attempting to install,
operate, or troubleshoot the Limitorque actuator.
c WARNING: Be aware of electrical hazards. Turn off incoming power before working on the actuator and before
opening the switch compartment.
c 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.
For maintenance and/or disassembly of the actuator while installed on the valve, or removal of the actuator from
the valve or actuated device, ensure that the actuator is not under thrust or torque load. If the valve must be left
in service and under load, the valve stem must be locked in such a way as to prevent any movement of the valve
stem.
c WARNING: Do not attempt to remove the spring cartridge cap, housing cover, or thrust base from the actuator
while the valve or actuated device is under load.
c 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 and valve.
c WARNING: Do not exceed any design limitations or make modifications to this equipment without first
consulting Limitorque.
c WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring must be wired
and checked for proper operation by a qualified tradesman.
c WARNING: Use of the product must be suspended any time it fails to operate properly
a CAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the overload.
a CAUTION: Do not operate the valve under motor operation without first setting or checking the limit switch
setting and motor direction.
a CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to this position
automatically when the motor is energized.
a CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
a CAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as serious personal
injury and/or damage to the actuator and valve may result.
a CAUTION: Eye bolts may be used to lift the actuator for installation on the valve or actuated device. Do not lift
actuator/valve or actuator/gearbox combinations using eye bolts in the L120 actuator.
a CAUTION: Do not lift the actuator by the handwheel.
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Limitorque Actuation Systems L120 Series FCD LMENIM1201-05-A4 – 03/18
4.2 Safety Practices
The following checks should be performed to maintain safe operation of the L120 actuator.
• Mount motors on a horizontal plane, if possible.
• Keep the controls compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up periodic operating schedule for infrequently used valves.
• Carefully check for correct motor rotation direction. If the motor is driving the valve in the wrong
direction, interchange any two leads on three-phase motors or switch the armature leads on DC and
single-phase motors.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on rising
stem valves.
• Verify all actuator wiring is in accordance with the applicable wiring diagram, national and local codes,
and Table 4.1.
Table 4.1 – Required Rating for External Wiring
Up to: Use wire rated at least:
40°C 60°C
60°C 75°C
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4.3 Initial Actuator Preparation
Replace all molded plastic conduit and top protectors (installed for shipping purposes only) with pipe
plugs when installation wiring is complete.
4.3.1 Mounting Base
The mounting hole sizes and quantities are as detailed in Table 4.2.
Table 4.2 – Mounting Base Dimensions
Actuator Size
L120-10 4
L120-20 4
L120-40 4
4.3.2 Stem Acceptance
The maximum stem acceptance is provided in Table 4.3.
Table 4.3 – Maximum Stem Acceptance
Actuator size
L120-10 1.25 32 1.00 25 ¼x3/32 8x6
L120-20 2.25 57 1.875 47 ½x3/16 14x9
L120-40 2.625 66 2.125 52 ½x3/16 16x10
Mounting Holes Tap size
Quantity MSS ISO
3
⁄8-16x0.88 M10x1.5x22.4
5
⁄8-11x1.25 M16x2x32
5
⁄8-11x1.25 M16x2x32
Drive 2 Drive 1
Tapped Bore Key
inch mm inch mm inch mm
Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
Balancing
300 Volt Torque Switch
Microswitch-Style Torque Switch
4.4 Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
a CAUTION: Disconnect all incoming power before opening limit switch compartment or working on
the torque switch.
• Do not use abrasive cloth to clean the contacts on the torque switch.
• Do not torque seat 90° operation valves nor run them against the stops. This may cause damage
to the valve.
NOTE: If the actuator has “torqued out,” release torque buildup by operating the actuator manually.
4.4.1 Setting Torque Switch
The torque switch was set at the factory according to customer-supplied information regarding necessary torque or thrust output that was provided at the time of the order. However, if the setting needs to
be adjusted, perform the following procedure:
Item letters correspond to Figure 4.1.
1. Place the L120 actuator in manual mode.
2. Release the load on the wormshaft spring pack.
3. For open and close directions, loosen Screw (A) and move Pointer (B) to desired position. A higher
number indicates a high torque and/or thrust output.
4. Tighten Screw (A).
5. Operate the valve electrically to seat valve and to ensure tight shutoff.
6. Rebalance torque switch if required.
a CAUTION: A torque switch limiter plate is provided on most actuators.
• Removal or modification of the torque switch limiter plate will void the actuator warranty.
• Do not exceed the setting indicated by this plate without contacting the Limitorque service
department.
• Installing or adjusting the torque switch with the actuator in a loaded condition will result in a loss
of torque protection.
Figure 4.1 – Microswitch-Style Torque Switch and 300 Volt Torque Switch
B
Maximum Stop
Setting Plate
Index Marks
A
Maximum Stop
Setting Plate
OPEN
-10-20
-10-20
CLOSE
Mounting
B
Screw
A
Balancing
Screws
Index Marks
B
A
A
B
Mounting
Screw
Screws
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