One-way valve

The utility model relates to a one-way valve which comprises a base, a one-way valve embedded part is detachably fixed in the base, a screw cover is connected to the one-way valve embedded part in a threaded mode, and an elastic valve assembly is arranged in the one-way valve embedded part. The elastic valve assembly comprises a thrust part, a spring and a sealing gasket, the sealing gasket is detachably fixed to one end of the thrust part, a channel is formed in the one-way valve insert, a conical opening is formed in the edge of one end of the channel, a limiting step is formed in the conical opening, the sealing gasket abuts against the arc face of the conical opening, and the thrust part is arranged in the channel. The spring is installed on the outer side of the thrust piece, one end of the spring abuts against the limiting step, and the other end of the spring supports the head of the thrust piece. The screw cover is arranged on the valve nozzle, the situation of mistaken touch is avoided, meanwhile, th