4.As a sort of Special Economic Zone, Export Processing Zone (EPZ) is of great benefit to promote the foreign openinglevel, explore the new way of foreign opening, administrate export processing industry and develop local economics and so on.
5.Meanwhile, the ball only needs to be rotated 90° during opening or closing of the valve, close time is short and the operation is flexible, so the valve is characterized by large flow capacity, good adjustability, safety and reliability, and the quickopening or closing.