What is the manufacturing level of the valve indicated by A1 and A2 on the certificate

A1 (1) and A1 represent that the valve manufacturing level is A1.

It refers to the scope representing the product. The design temperature is greater than 425 ℃, the nominal pressure is greater than 10MPa, and the nominal diameter is greater than or equal to 300mm.

A2 (1), A2 is the manufacturing level of valve, which is A2.

1. It refers to the scope of representative products. The design pressure is greater than 6.4Mpa, and the nominal diameter is greater than or equal to 300mm.

2. The design temperature is lower than - 46 ℃, the nominal pressure is greater than 4MPa, and the nominal diameter is greater than or equal to 300mm.
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