CONTROL AND SAFETY DEVICE FOR VALVE MEANS

摘要

A control and safety device (1) for valve means comprising a control circuit (2) of actuator means (3) for opening and closing valve means, a control unit (4) and means for monitoring the control circuit (2) and the control unit (4). The control circuit (2) is adapted to respond to a direct voltage signal (EN2), generated by the control unit (4). The monitoring means further comprise a monitoring circuit (5) comprising enabling/disabling means adapted to respond to an alternating voltage signal (EN1), generated by the control unit (4), in order to enable the operation of the control circuit (2) when the alternating voltage signal (EN1) has an amplitude comprised between a first lower end and a first upper end of a predetermined range of voltage values and a frequency comprised between a second lower end and a second upper end of a predetermined range of frequency values.