This standard specifies requirements for valve inspection and pressure testing.
This standard is applicable to inspection and pressure testing for gate valve, stop valve, plug valve, ball valve, check valve and butterfly valve of the metal seal pair, elastic seal pair and non-metal seal pair (for example, ceramics).
This standard may also be applicable to other types of valves upon the consent of the Supplier and the Purchaser.
Elastic seal pair refers to:
(1) Seal pair composed of soft seal pair, solid and semi-solid grease (for example, oil seal plug valve);
(2) Seal pair composed of non-metal and metal materials;
(3) Other types of seal pair in accordance with elastic seal leakage rate specified in Table 3.
2 Normative References
The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties concerned are encouraged to discuss the possibility of applying the latest edition of the following standard.
JB/T 7927-1999 Valve Cast Steel - Visual Quality Requirements
