1.Manufacturing and acceptance technology conform to E101 and JB/T3595-2002.

2.Valve tests conform to JB/T3595-2002 and GB/T13927-92. And valve sealing tests as well as upper  sealing testing pressure conform to HB/T3595-2002.

3.Structure and length conform to GB/T15188.1-94 or as specified by customer.

4.Welding slope conforms to GB12224-89 or as specified by customer.