A control circuit for the motor of a motorized hydraulic valve, particularly for boilers and the like

摘要

The control circuit comprises a pair of terminals (A, B) connected to an alternating voltage supply, the motor (M) being connected between these terminals. A first and a second current path (C, D), essentially in parallel with each other and in series with the motor (M), are formed between these terminals. Each current path (C, D) comprises a corresponding switch (c, d) which can be controlled selectively by the motor (M) in such a way that each switch closes when the motor (M) sets the valve to a corresponding operating condition. The current paths (C, D) include electrically operated switches which can selectively connect one of said paths (C, D) to a supply terminal (B). These switches comprise a first and a second optical triac (OT1, OT2) which arc connected in series in the first and second current path (C, D) respectively, and which arc associated, respectively, with a first and a second controlling emitting diode (D1, D2).