Automatic switch valve core

The utility model discloses an automatic switch valve core. The water passing amount of the reverse water passing hole is large or small; the automatic switch valve core can be designed into five structural modes; forming automatic spool series, one kind with automatic switching function, namely, one kind with automatic switching function The utility model discloses a micro-leakage type automaticswitch valve core, which has four functions, namely an automatic switch function and a multi-path water supply function. A water passing groove type automatic switch valve element, a reducing step type automatic switch valve element, a horn opening type automatic switch valve element and a hollow type automatic switch valve element are arranged in the valve body. The automatic water switching device has an automatic water switching function, after the automatic water switching device is assembled on a valve or a control device related to the water heater, the valve or the control device has the automatic water switchi