JB/T 51114-1999
Internal combustion engines - Cooling water pumps - Product quality grading (Internal use)
内燃机 冷却水泵 产品质量分等（内部使用）
Catalogue
前言 → 1 范围 → 2 引用标准 → 3 质量指标 → 4 试验方法 → 5 检验规则 Foreword → 1 Scope → 2 Normative References → 3 Quality Indicators → 4 Test Methods → 5 Inspection Rules
Scope
This standard specifies the quality indicators, test methods, and inspection rules for three grades of internal combustion engine cooling water pumps: qualified product, first-grade product, and superior product. This standard is applicable to the quality inspection and grade evaluation of cooling water pumps for medium and small power internal combustion engines.
本标准规定了内燃机冷却水泵合格品、一等品和优等品三个等级的质量指标，试验方法，检验规则。本标准适用于中小功率内燃机冷却水泵产品质量的检测和等级评定。
Normative References
Keywords
Application Summary AI generated
Manufacturers and testing organizations of internal combustion engine cooling water pumps use this standard to evaluate product quality grades. They rely on it to test and classify pumps based on performance, sealing, rotation, installation accuracy, appearance, and durability. This standard provides a unified basis for quality control and grade certification, helping to improve product reliability and market competitiveness.
内燃机冷却水泵的制造商和检测机构使用本标准来评定产品质量等级。他们依据本标准对水泵的性能、密封性、转动性、安装精度、外观和耐久性进行检测和分级。本标准为水泵产品的质量控制和等级认证提供了统一的依据，有助于提升产品可靠性和市场竞争力。
AI Summary AI generated
JB/T 51114-1999 specifies three quality grades for internal combustion engine cooling water pumps: qualified, first-grade, and superior. It covers indicators such as performance (flow rate, head, efficiency), sealing, rotation, installation accuracy, appearance, and no-failure durability, along with corresponding test methods and sampling inspection rules. Applicable to quality inspection and grade evaluation of cooling water pumps for medium and small power engines, it provides a unified technical basis for product grading.
本标准JB/T 51114-1999规定了内燃机冷却水泵的合格品、一等品和优等品三个质量等级。标准涵盖性能（流量、扬程、效率）、密封性、转动性、安装精度、外观及无故障耐久等指标，并给出了相应的试验方法和抽样检验规则。适用于中小功率内燃机冷却水泵的质量检测和等级评定，为产品分级提供了统一的技术依据。
Key Sentences extracted from text
本标准规定了内燃机冷却水泵合格品、一等品和优等品三个等级的质量指标，试验方法，检验规则。
内燃机冷却水泵（以下简称水泵）按其不同质量指标定为合格品、一等品、优等品三个等级。
水泵内腔通入压缩空气，其压力为50 kPa，压力平衡时间为10 s，测试时间为5 s，泄漏量不大于10 mL/min。
无故障耐久考核按JB/T 50033 的规定。
产品质量一次检测如达不到合格品等级时，不允许进行加倍加严检查，但允许半年以后给予一次补查机会，如补查合格，仍可评为合格品，但不得评为一等品、优等品。
This standard specifies the quality indicators, test methods, and inspection rules for three grades of internal combustion engine cooling water pumps: qualified product, first-grade product, and superior product.
Internal combustion engine cooling water pumps (hereinafter referred to as pumps) are classified into three grades—qualified product, first-grade product, and superior product—according to their different quality indicators.
Compressed air is introduced into the pump cavity at a pressure of 50 kPa, with a pressure stabilization time of 10 s and a test time of 5 s; the leakage shall not exceed 10 mL/min.
The no-failure durability assessment shall be carried out in accordance with JB/T 50033.
If the product quality fails to reach the qualified product grade in a single inspection, double tightening inspection is not permitted, but one supplementary inspection opportunity is allowed after six months; if the supplementary inspection passes, it can still be rated as qualified product, but not as first-grade or superior product.
Standard Timeline
Changes from replaced version:
- 对原标准作了编辑性修改，主要技术内容没有变化
- Editorial modifications were made to the original standard, with no changes to the main technical content.