The top entry supported design and unique seat retraction technique gives the convenience of in-line repair or replace valve internal components without dismantling it from pipe line. Its body adopts an integrated design, reducing leak points.

Its seat design is available for either soft or hard seal, easy for maintenance. It has a top entry and on line maintenance function.

Its most difference from common ball valve is that its maintenance can be made on pipe line and without dismounting from the pipe line.

The back space seat structure is adopted for the seat and the rear portion of seat retainer is oblique angle to prevent accumulation of impurity from affecting back space of seat.