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How to keep valve positioners on target

Valves, the actuators that move them, and the electronic circuits that control them, take a lot of abuse every day. This can cause screws to reposition, springs to weaken, and mechanical linkage to loosen. Electronic components may also experience "calibration drift" causing valves to malfunction, resulting in improper regulation of the gas or liquid they are controlling.

Avoid these problems with a preventive maintenance program. Key areas to test include:

  • Valve closing to determine whether the positioner fully closes the valve at the 4.0mA current level
  • Valve opening to determine at what point the valve starts to open and to assure there is no force holding the valve closed
  • Span position to assess the stability of the valve in the fully open position
  • Linearity of valves with linear action
  • Overall operation to ensure that the valve performs smoothly without sluggishness or oscillation during the opening and closing process

These checks need to be conducted quickly to minimize down time. And when calibration drift is found, they should be followed by quick recalibration.

©2019 Fluke Corporation. Specifications subject to change without notice. 6004750

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©1995 - 2019 Fluke Corporation
    • Products
      • Accessories
        • See all
      • Building infrastructure
        • HVAC tools
        • Industrial Ethernet tools
        • Indoor air quality testing
        • Laser distance meters
        • Laser levels
        • Network cable testers
      • Calibration tools
        • Fluke Calibration
        • mA loop calibrators
        • Multifunction calibrators
        • Pressure calibrators
        • Temperature calibrators
      • Electrical tools
        • Basic electrical testers
        • Battery analyzers
        • Clamp meters
        • Digital multimeters
        • Earth ground
        • Installation testers
        • Insulation testers
        • Insulated tools
        • Portable appliance testers
        • Portable oscilloscopes
        • Power quality
      • Fluke software
        • Fluke Calibration software
        • Fluke SmartView
        • Fluke Networks software
      • Industrial imaging
        • See all
      • Intrinsically safe
        • See all
      • Mechanical maintenance
        • Laser alignment
        • Vibration analysis
      • Temperature measurement
        • Contact thermometers
        • IR thermometers
      • Thermal imaging
        • IR windows
        • Thermal cameras
        • Visual IR thermometers
      • Awards
      • New Fluke products
      • Test tools catalog
    • Learn
      • Best practices
        • Custody transfer
        • Electrical inspection
        • Energy efficiency
        • Equipment and production line testing
        • Fluid systems
        • Measurement basics
        • Motors and drives
        • Pressure calibration
        • Preventive maintenance
        • Safety
        • Temperature calibration
        • Test tools basics
      • Blog
      • Fluke education partnership program
      • Leak detector
      • Library
      • Online courses
      • Tools and calculators
        • Air leakage calculator
        • FOV calculator
      • Tradeshows and seminars
      • Webinars
    • Support
      • About us
        • Careers
        • Companies
        • Contact us
        • Corporate profile
        • Directions
        • Integrity
      • Calibration Services
      • Manuals
      • Press releases
      • Product registration
      • Repair
      • Return materials authorization
      • Safety notices
      • Service center locations
      • Software downloads
      • Warranties
    • Where to buy
      • Promotions and contests
    • Other Fluke companies
      • Fluke Calibration
      • Fluke Biomedical
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      • See more Fluke brands
        • Accelix
        • Amprobe
        • Beha-Amprobe
        • Comark
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        • Landauer
        • Pacific Laser Systems
        • Pomona
        • Pruftechnik
        • RaySafe
        • Schad