Non-contact valve positioner

The range of Keystone Flow Control valve positioners has been extended with the introduction of the K-block magnetically-operated quarter-turn position indicator. Housed in a resin and polyurethane potting enclosure which resists corrosive materials such as aliphatic and aromatic hydrocarbons, the unit comprises a sealed sensor with two inductive proximity switches and an indicator. As the valve position changes, the sensor detects one or other of the screws providing valve open and valve closed output signals.