Flowserve Limitorque L120-190

Questions and Answers

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Regina DiazAug 7, 2025
What to do if unable to operate Flowserve Controller actuator by motor?
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  Teresa DavisAug 7, 2025
  If you're unable to operate your Flowserve Controller actuator by motor, begin by verifying the motor power and control circuits for both supply and continuity. Then, check that the supply voltage matches the motor and controller's nameplate rating. If these are correct, measure the motor's amperage load. If the motor is stalled, immediately shut off the power and use the handwheel to manually move the valve.
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Anthony BowmanAug 16, 2025
Why is there excessive handwheel effort on my Flowserve Controller?
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  ileachAug 16, 2025
  If you're experiencing excessive handwheel effort with your Flowserve Controller, check the lubrication method and valve stem for any damage. Also, ensure the valve packing gland isn't too tight and that the valve is properly lubricated. See if the stem nut is too tight on the valve stem. Finally, inspect the valve and its parts for any faults or damage.
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shawnlewisAug 27, 2025
How to troubleshoot geared limit switch fails to stop valve travel on Flowserve Controller?
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  Sandra EllisAug 27, 2025
  If the geared limit switch fails to stop valve travel on your Flowserve Controller, examine the control wiring and motor reversing contactor. Check the geared limit switch setting and ensure the setting rod has been backed off after each side of the switch has been set. If problems persist, remove the limit switch and inspect it for damaged or broken gear teeth.

Summary

Introduction

Purpose

Explains the manual's objective for installing and maintaining actuators.

User Safety

Details precautions for reducing personal injury and equipment damage.

Initial Inspection and Storage Instructions

Product Identification

Information found on the actuator and motor nameplates.

Inspection and Recording

Procedures for checking equipment condition and recording data.

Short-Term Storage

Recommended procedures for storing actuators for less than one year.

Actuator Weights

Installation Instructions

Safety Precautions

Critical safety warnings before installing, operating, or troubleshooting.

Safety Practices

Checkpoints for maintaining safe operation of the L120 actuator.

Actuator Preparation

Steps for preparing the actuator before installation.

Mounting Base

Details mounting hole sizes and quantities for actuators.

Stem Acceptance

Specifies the maximum stem acceptance for actuators.

Double Torque Switch

Explains the function and adjustment of the double torque switch.

Setting Torque Switch

Procedure for setting the torque switch for desired output.

Balancing Torque Switch

Steps to balance the torque switch for equal backlash.

Torque Switch Terminal Connections

Wiring connections for torque switch using ring-tongue terminals.

Geared Limit Switch - Rotor Type

Describes the geared limit switch and its adjustment.

Setting Limit Switch

Procedure for setting the limit switch rotor segments.

Combination of Contacts

How to rearrange cams for contact combinations.

Position Indication

Information on local and remote valve position indicators.

Local Position Indication

How to set the local dial position indicator.

Remote Position Indication

Details about the digital position indicator.

Calibrating Position Transmitter PT20 SD

Steps to calibrate the PT20SD position transmitter.

Operation

Electrical Start-Up

Steps for the initial electrical start-up of the actuator.

Typical Wiring Diagram

Representations of typical wiring applications for actuators.

Manual Operation

How to operate the actuator using the handwheel.

Motor Operation

Information on operating the actuator via the motor.

Torque and Travel Limiting

Explains torque and travel limiting mechanisms.

Maintenance

Lubrication

Guidelines for lubricating the L120 series actuators.

Lubrication Inspection

Procedures for inspecting actuator lubrication.

Factory Lubricant

Details on the factory-specified lubricants for gear case and limit switch.

Disassembly and Reassembly

L120-190, -420, and -800

Disassembly and reassembly procedures for specific actuator sizes.

To Replace Stem Nut Only

Steps for replacing the stem nut on the actuator.

L120-190, 420, 800 Disassembly

Detailed steps for disassembling L120-190, -420, and -800.

Reassembling Actuator Sizes L120-190, -420 and -800

Steps for reassembling L120-190, -420, and -800.

Gaskets

Information on gasket thickness and determination for housing covers.

L120-2000

Disassembly and reassembly procedures for the L120-2000 actuator.

Drive 2 Disassembly (Thrust Housing Only)

Steps to disassemble the thrust housing of L120-2000.

Drive 1 Disassembly (Torque Housing)

Steps to disassemble the torque housing of L120-2000.

Drive 1 (Torque Housing) Reassembly

Steps to reassemble the torque housing of L120-2000.

Drive 2 (Thrust Housing Only) Reassembly

Steps to reassemble the thrust housing of L120-2000.

Standard Wiring Diagrams

Troubleshooting

How to Order Parts

EC Declaration of Conformity