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SCHIEBEL LK Series - User Manual

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Operation manual for linear units type LK
DS-ENGLISH-SCHUB-LK-V1.00-2020.03.23
SEC-DS-ENGLISH-SCHUB-LK-V1.00-2020.03.23
Operation manual for linear units type LK
1 General
Type LK linear units are offered in different variants, see Table 1. These are mounted together with electric
open/close or modulating actuators, of the series CM, on valves which require a linear positioning movement.
These linear units convert the torque output from the actuator into an axial force through a ball screw drive.
Not only is a higher control accuracy allowed, but also a longer lifetime is provided with the use of a ball screw
drive. The combination of actuator and linear unit, is based on the required thrust and the necessary stroke.
Type Actuator
Output
flange
Stroke
Output
thread
Pitch Factor (
Nm
kN
) Weight [kg]
LK50 CM03 G0/F10 50mm M20x1,5 5mm/rev 1,06 12,3
LK100 CM03 G0/F10 100mm M20x1,5 5mm/rev 1,06 15,0
LK120 CM06 G0/F10 120mm M20x1,5 5mm/rev 1,06 19,2
CM06 G
1
2
/F14 120mm M36x3,0 5mm/rev 1,06 23,6
Table 1: Technical data linear units
2 Structure
Figure 1 shows e.g. an CM03 actutator with mounted LK linear unit. The linear unit itself consists essentially of
a solid cast housing, a mounted spindle nut and a non-rotating spindle, see Figure 2. To prevent contamination
by dusty ambient air and to ensure the mechanical protection, the linear unit is completely sealed with O-rings
at the output.
Figure 1: CM03-Actuator with mounted LK100 linear unit
1

Table of Contents

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Summary

General Information

Linear Unit Structure

Packaging, Transport, and Storage

Assembly and Disassembly on Valves

Security and Assembly Instructions

Summarizes safety and qualification requirements for mounting and commissioning.

Assembly Procedure

Step-by-step instructions for mounting the linear unit and actuator onto a valve.

Disassembly Procedure

Step-by-step instructions for removing the linear unit from a valve.

Commissioning

Maintenance Schedule

Moving Interval

Specifies the required actuation frequency for the linear unit.

Greasing Interval

Defines the recommended schedule for re-greasing the linear unit.

Lubricant Recommendation

Summary

General Information

Linear Unit Structure

Packaging, Transport, and Storage

Assembly and Disassembly on Valves

Security and Assembly Instructions

Summarizes safety and qualification requirements for mounting and commissioning.

Assembly Procedure

Step-by-step instructions for mounting the linear unit and actuator onto a valve.

Disassembly Procedure

Step-by-step instructions for removing the linear unit from a valve.

Commissioning

Maintenance Schedule

Moving Interval

Specifies the required actuation frequency for the linear unit.

Greasing Interval

Defines the recommended schedule for re-greasing the linear unit.

Lubricant Recommendation

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

The LK series linear units are designed to convert the torque output from an electric open/close or modulating actuator (CM series) into an axial force, primarily for use with valves requiring linear positioning movement. This conversion is achieved through a ball screw drive mechanism, which offers enhanced control accuracy and extended operational lifespan compared to other drive types. The specific combination of actuator and linear unit is determined by the required thrust and stroke length for the application.

Function Description:

The core function of the LK linear unit is to translate rotational motion from an actuator into precise linear motion. This is crucial for controlling valves that operate by moving a stem linearly to open or close, or to modulate flow. The ball screw drive is a key component, ensuring efficient and accurate force transmission. The linear unit itself comprises a robust cast housing, a mounted spindle nut, and a non-rotating spindle. To maintain operational integrity and prevent contamination from dusty ambient air, the unit is fully sealed with O-rings at the output.

Important Technical Specifications:

The LK linear units are available in several variants, each with specific technical data:

  • LK50:

    • Actuator: CM03
    • Output flange: G0/F10
    • Stroke: 50mm
    • Output thread: M20x1.5
    • Pitch: 5mm/rev
    • Factor (Nm/kN): 1.06
    • Weight: 12.3 kg

  • LK100:

    • Actuator: CM03
    • Output flange: G0/F10
    • Stroke: 100mm
    • Output thread: M20x1.5
    • Pitch: 5mm/rev
    • Factor (Nm/kN): 1.06
    • Weight: 15.0 kg

  • LK120 (two variants):

    • Variant 1:
      • Actuator: CM06
      • Output flange: G0/F10
      • Stroke: 120mm
      • Output thread: M20x1.5
      • Pitch: 5mm/rev
      • Factor (Nm/kN): 1.06
      • Weight: 19.2 kg
    • Variant 2:
      • Actuator: CM06
      • Output flange: G/F14
      • Stroke: 120mm
      • Output thread: M36x3.0
      • Pitch: 5mm/rev
      • Factor (Nm/kN): 1.06
      • Weight: 23.6 kg

The internal components of the linear unit include an output flange, various O-rings for sealing, a groove nut, bearing plate, axial deep groove ball bearing, bearing ring, intermediate flange, housing tube, base flange, wiper, feather keys, ball screw spindle, coupling and output shaft, cup spring, spindle pin, and spindle pin ring nut.

Usage Features:

The assembly and disassembly of LK linear units on valves require adherence to specific safety and operational guidelines:

  • Qualified Personnel: Only qualified personnel familiar with the product's assembly, commissioning, and operation should mount and commission the device.
  • Depressurization: Before assembly or disassembly, the pipes where the valve is installed must be depressurized. Removing the actuator from the linear unit will cause the valve stem position to be unfixed due to the linear unit's non-self-locking property.
  • End Stops: The linear unit has mechanical end stops. It is critical not to move against these end stops during electrical operation to prevent damage. Actuator end limits must be set accordingly.
  • Valve Cone Position: The valve cone should never be brought into the CLOSED position with excessive force, as this can damage high-quality sealing edges.
  • Assembly Procedure:
    1. Verify matching flanges between the actuator, linear unit, and valve.
    2. Thoroughly clean all screw-on surfaces and bare parts.
    3. Lightly grease connections and the linear unit spindle.
    4. Move the valve cone to the CLOSED position.
    5. Turn the spindle nut to place the linear unit in a central position.
    6. Mount the linear unit on the valve, tightening screws crosswise. The coupling will be connected later.
    7. Mount the actuator on the linear unit, tightening screws crosswise.
    8. Extend the spindle using the handwheel until the coupling of the linear unit and the valve align.
    9. Connect the coupling.
    10. Use the handwheel to move the linear unit to a center position to prevent damage during startup.
  • Disassembly Procedure:
    1. If the valve is fully closed, move the valve cone to approximately ten percent OPEN.
    2. Loosen screws between the actuator output flange and the linear unit, then dismount the actuator.
    3. Open the spindle coupling between the linear unit and the valve.
    4. Loosen screws between the linear unit output flange and the valve.
    5. Dismount the linear unit from the valve.

Maintenance Features:

Regular maintenance is essential to ensure the longevity and optimal performance of the LK linear units:

  • Running Noises: Pay attention to increased running noises. If observed, grease the two lubrication nipples of the linear unit to lubricate the bearings and spindle guidance.
  • Fixing Screws: Regularly check the fixing screws between the actuator, linear unit, and valve for firm hold. Tighten them to the specified torques if necessary, as detailed in the "Installation instructions" chapter of the standard user manual.
  • Moving Interval: The linear unit should be actuated at least every 3 months to prevent seizing and ensure smooth operation.
  • Greasing Interval: Every 6 months, the linear unit should be re-greased via the greasing nipples.
  • Lubricant Recommendation:
    • Type: Lubricating grease DIN 51825-K(P) R -40. This is a water-repellent complex grease based on Al-soap, offering high resistance to acids and alkalis.
    • Ambient Temperature Range: -40 to +85 °C
    • Worked Penetration (0.1 mm): 310 - 340
    • Dripping Point: Approximately 260 °C
    • NLGI-Class: 1
    • Properties: Acid-free, not or only slightly reactive with water.

SCHIEBEL LK Series Specifications

General IconGeneral
BrandSCHIEBEL
ModelLK Series
CategoryIndustrial Equipment
LanguageEnglish