Valve Inspection Standards
time：2025-03-02
Scope
This standard specifies the inspection and pressure test requirements.
This standard applies to the inspection and pressure test of metal sealing pairs, elastic sealing pairs, and non-metallic sealing pairs (such as ceramics) for valves, including their and After the agreement of both parties, it can also be applied to other types of valves.
Elastic sealing pairs refer to:
1. Sealing pairs composed of soft seals, solid and semi-solid lubricants (such as oil seals)
2. Sealing pairs composed of non-metallic and metallic materials
Referenced Standards
The provisions contained in the following standards are incorporated into this standard through their reference in this standard. When this standard is published, the indicated versions are all effective. Since all standards will be revised, the parties using this standard should explore the possibility of using the latest version of the following standards.
JB/T 7927-1999 Quality Requirements for the Appearance of Valve Cast Steel Components
Terms
Unidirectional Seal: After the valve is closed, the medium must enter from one direction of the two ends for the sealing pair to maintain tightness
Bidirectional Seal: Regardless of the direction from which the medium enters from the two ends of the valve, after the valve is closed, the sealing pair can maintain tightness
Inspection Notice: When the buyer requires inspection, the manufacturer shall, according to the required test items
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