1. The product has reasonable structure,reliable sealing,excellent performance.

2. Its sealing is realized by the sealing face around the sleeve,It has unique 360 degree metal edge for protection and fixing of the sleeve.

3. There is no cavity in the valve for accumulation of medium.

4. Metal edge provides the function of self-cleaning when the plug is rotated,applicable to the operation condition that is glutions and apto smudge.

5. Its characteristic double-dircction flow makes installaiton and use more convenient.

6. The materials of the parts and sizes of flanges can be reasonabnly configured according the actual operation aondition of the requirements of the customers,so as to meet the various needs of engineering.