The low price thread ball check valve includes a valve body with connecting flanges at both ends and a rolling ball inside. The valve body is provided with a ball chamber for accommodating the rolling ball. The shape of the ball chamber is a truncated cone. The outer end of the valve body is provided with a flange, and a cover plate is arranged on the flange; the inlet end of the valve body is provided with an arc portion whose radian is equal to the radian of the surface of the rolling ball. An inclined slideway is provided along the edge of the arc portion to the ball chamber. The utility model has a simple structure, and the rolling ball has a large moving space in the ball chamber. It rotates under the push of the medium and collides with the ball chamber wall and the cover plate to clean up the impurities deposited on the surface, that is, it has the function of self-cleaning and reduces the the frequency and cost of maintenance.

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