Explosion -proof thrift lock of prevening disaster

The utility model provides an explosion -proof thrift lock of prevening disaster, valve gap including valve body and valve body top, at the inside delivery port that is equipped with of valve body, be equipped with the hob on the valve gap, go up the hob lower extreme and be equipped with the piston, the piston below is equipped with the lip seal circle, is equipped with the valve barrel at piston and lip seal circle outer lane, and the valve barrel lower part is equipped with the valve barrel aperture, and valve body inside still is equipped with the flow control subassembly and can realizes self -closing when discharge is too big. This thrift lock has a function of regular tap valve, simultaneously can also be when anhydrous burst back self -closing's function of self -closing and pipeline, low cost can replace the ordinary valve in the existing market.