Valve Positioner

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  • Troubleshooting Reed Switches Used In Valve Position Indication
    A common method to provide remote position indication in solenoid operated valves (SOV) is to use non-contact reed switches in conjunction with a permanent magnet. This article describes some common issues experienced with non-contact reed switches when used in these systems, and how to diagnose
  • Default Position & Fail-Safe Valves, Explained
    Commonly known as "default position," actuated or automatic valves that revert to a pre-determined position after the actuating force is removed are often referred to as "fail-safe" valves.
  • Position Sensors in Solenoid Valves (.pdf)
    Implementation of state of the art automated laboratory research and computer or microcontroller controlled instrumentation technology has always been restricted by conventional valve technology.
  • Butterfly Valves
    MDC Butterfly valves require only one-quarter turn rotation of the handle to go from fully open to the fully closed position. In the 1–1/3" Mini Del-Seal™ CF flange series, a spring loaded ball bearing becomes seated in an indent providing a positive mechanical stop. All other size valves employ a
  • Thermal Shutoff Valves - Then and Now
    vents the pneumatic actuator, allowing it to move into its fail-safe position (open or closed). At the same time, it closes the supply airline, eliminating oxygen that would feed the fire. A second entire fusible link valve assembly dedicated to the thermal shutdown is no longer required.
  • Gate Valves Option Guide
    MDC circular C-Loc® gate valves can be fitted with optional high precision, modular mechanical position indicators (MPI). This new MPI system consists of two single pole double throw micro switches fitted with integral hinged lever and roller actuators. Each micro switch is wired in a normally open
  • Introduction to Check Valves
    The patented diaphragm in the Plast-O-Matic True Blue Check Valve is designed to re-seat with a bubble tight seal regardless of mounting position or reverse flow. Ball style check valves require two properties to seal properly: First, the ball check must be mounted with the flow direction pointed
  • Valve Actuators and Positioners Go Digital
    Fieldbus is the name of a family of industrial computer network protocols used for real-time distributed control, standardized as IEC 61158. Advanced digital fieldbus technology has been successfully used in oil and gas, petrochemical, pulp and paper, and other industries. This technology has also

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