Low-cost electromagnetic valve time-delay working circuit

The utility model relates to a low-cost electromagnetic valve time-delay working circuit. The circuit comprises a resistor R1, a capacitor C1, a capacitor C2, a capacitor C3, a rectifier bridge BD1, athree-terminal regulator U1 and a solenoid valve coil L1. The input end of the rectifier bridge BD1 is connected with an external AC voltage. Wherein the resistor R1 and the capacitor C1 are connected in parallel to form a resistance-capacitance voltage reduction circuit which is connected in series to one side input end of the rectifier bridge; the output end of the rectifier bridge BD1 is connected to two sides of the capacitor C2; one end of the capacitor C2 is connected to the input end of the three-terminal regulator U1; the other end of the capacitor C2 is connected to the grounding endof the three-terminal regulator U1, the grounding end of the three-terminal regulator U1 is grounded, one end of the capacitor C3 is connected to the output end of the three-terminal regulator U1, the other end of the capacit