ES1043088U - Electrical circuit for feeding a gas valve safety. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Electric circuit for the supply of a safety gas valve, where the magnetic group (gm) of the valve being in parallel with a thermocouple (tp) flame detector, is connected to an electric battery (2) through the circuit (1) by means of an external switch (s) to generate a current (I) of maintenance of the magnetic group (gm) in the armed condition, during a time interval (t2) adjustable after the switch (s) is opened outside, the circuit (1) comprising capacitive means (c1, r2) of discharge of a current (I), interruption means (q2, q4) of the maintenance current (I), means (r2, r5, q1 - r1), r8, q3), and means (r2, c1, r6) of timing of said adjustable interval (t2), characterized in that the interruption means (q2, q4) is a transistor (q2), controlled by a second transistor (q1) in whose base a control current (I) is injected by the discharge capacitor (c2, r2) discharge means (c2, r2), and timing means (r2, c1, r6) comprise a capacitor (c1) connected to the pole of the same sign of the discharge capacitor (c2), and a resistor (r6) in series with the transistor switch (q2), which defines between them an intermediate point (VI) whose variation of the voltage, determines the derivation of the control current (I) towards the timing capacitor (c1), to cut the current (I) to the magnetic group (gm). (Machine-translation by Google Translate, not legally binding)