1. body, bonnet, disc, etc. directly contact with the media parts, all lined with fluorine plastic.

2. When the medium flows in the prescribed direction, the valve disc is opened by the medium force; when the medium is countercurrent, the valve disc closes because of the weight of the disc and the effect of the medium reverse force, so that the valve disc and the sealing surface of the valve seat are close together to prevent the medium countercurrent.

3. small volume, light weight, good processing technology.

4. the overall structure, simple and compact, beautiful appearance.

5. sensitive action, good sealing performance, long service life and high reliability.