JB/T 53183-1999

Valve manufacturers use this standard to grade the quality of gray iron castings, determining whether products are qualified, first-class, or superior. Quality inspectors rely on the specified test methods and sampling plans to evaluate mechanical properties, dimensional tolerances, and surface roughness. This standard provides a unified quality assessment framework for the valve industry, enhancing product competitiveness and customer confidence.

阀门制造企业使用本标准对灰铸铁件进行质量分等，以确定产品属于合格品、一等品还是优等品。质检人员依据本标准规定的试验方法和抽样方案，对铸件的力学性能、尺寸公差和表面粗糙度进行检测和评定。该标准为阀门行业提供了统一的质量评价依据，有助于提升产品竞争力和用户信任度。

This standard provides technical specifications for quality grading of gray iron castings for valves, classifying castings into three grades: qualified, first-class, and superior. It specifies assessment criteria for mechanical properties, dimensional tolerances, and surface roughness, along with test methods (e.g., tensile strength per JB/T 7945) and sampling procedures (randomly selecting 3 units from finished castings). Annex A provides a dimensional tolerance table. Applicable to gray iron castings, flanges, and pipeline accessories for valves, the standard aims to unify quality evaluation and promote product improvement.

本标准为阀门用灰铸铁件的产品质量分等提供了技术规范，将铸件分为合格品、一等品和优等品三个等级。标准规定了力学性能、尺寸公差和表面粗糙度的考核指标，并明确了试验方法（如抗拉强度试验按JB/T 7945）和抽样方案（从成品中随机抽取3台）。附录A提供了铸件尺寸公差表。该标准适用于阀门用灰铸铁件、法兰及管路附件，旨在统一质量评价，促进产品质量提升。