| 主权项 |
1. A control and safety circuit (1) for gas delivery valves, comprising:
an actuator (50) for opening the gas delivery valve; a control unit (100) designed to emit a command signal (V2), and a clock signal (CK), the control unit (100) being capable of generating a further command signal (V1) to activate the actuator (50); a memory (5) placed between the control unit (100) and the actuator (50), the memory being capable of receiving the command signal (V2) and the clock signal (CK) as inputs, the memory emitting an output signal (V3) which is a function of the input command signal (V2) and the clock signal (CK), the output signal (V3) being sent to the actuator (50) to command the same to open the valve; and a first switch (3) connected to the actuator (50), the first switch—when in an on operating position—controlling the actuator (50) to open the valve and the first switch (3) being capable of moving into the on operating position on receipt of the output signal (V3) from the memory (5), a second switch (2) connected to the actuator (50), the further command signal (V1) being sent as an input to the second switch (2) which is capable of moving into the on operating position on receipt of the further command signal (V1), the further command signal (V1) is a step signal which is alternately equal to zero when no signal is present or a voltage signal which is substantially constant over time, wherein the first switch (3) and the second switch (2) are connected in series for controlling the actuator (50) to open the valve so that the actuator (50) is energized to open the valve only when both the switch (3) and the second switch (2) are in the on operating position. |
