Abstract: A valve control and monitoring assembly is mounted substantially alongside the upwardly extending auxiliary shaft of a rotary valve actuator, rather than directly above the auxiliary shaft. This valve control and monitoring assembly includes a targeting device and LEDs that provide for immediate visual indication as to the position of the driven valve, and may also include a pneumatic valve for effectuating opening and closing of the driven valve.

Abstract: A magnetic proximity switch comprises an elongated, substantially cylindrical body which houses a switching circuit, said switching circuit closing when a magnetic target passes within a certain range of the switch. This switching circuit preferably comprises two leaf portions hermetically sealed in a glass enclosure within the switch body, a biasing magnet being positioned adjacent one leaf portion for generating a flux that is shared with the one leaf portion, extending the magnetic field toward the end of the switch body and effectively increasing the sensing range of the switch. The switch also is equipped with a plurality of visual indicators, preferably light-emitting diodes, which are illuminated when the switch is closed to provide immediate visual indication as to the position of the switch, regardless of the rotational orientation of the switch.