JB/T 51172-1999
Fuel Injection Nozzle Assembly for Diesel Engines - Product Quality Grading (Internal Use)
柴油机喷油器总成 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 closed-type fuel injection nozzle assemblies (hereinafter referred to as injectors) for medium and small power diesel engines. This standard applies to the product quality testing and grade evaluation of injectors for medium and small power diesel engines.
本标准规定了中、小功率柴油机用闭式喷油器总成（以下简称喷油器）的质量指标、试验方法、检验规则。本标准适用于中、小功率柴油机用喷油器的产品质量检测和等级评定。
Normative References
Keywords
Application Summary AI generated
Diesel engine manufacturers and testing laboratories use this standard to evaluate the quality grade of fuel injection nozzle assemblies. They rely on the quality indicators, test methods, and inspection rules defined here to test and classify products. This standard ensures the reliability and consistency of injectors, which is critical for diesel engine performance and emissions.
柴油机制造商和检测机构使用本标准来评定喷油器总成的质量等级。他们依据本标准中的质量指标、试验方法和检验规则，对产品进行检测和分级。本标准确保了喷油器产品的可靠性和一致性，对柴油机性能和排放有重要影响。
AI Summary AI generated
This standard JB/T 51172－1999 specifies the quality grading requirements for closed-type fuel injection nozzle assemblies for medium and small power diesel engines, including quality indicators, test methods, and inspection rules. It defines key parameters such as needle valve opening pressure, spray quality, cleanliness, flow deviation, reliability (MTBF), and B50 ultimate life, with graded limits for qualified, first-class, and premium products. It applies to product quality testing and grade evaluation, replacing the previous version.
本标准JB/T 51172－1999规定了中、小功率柴油机用闭式喷油器总成的质量分等要求，包括质量指标、试验方法和检验规则。标准明确了针阀开启压力、喷雾质量、清洁度、流量偏差、可靠性（MTBF）和B50极限寿命等关键指标，并给出了合格品、一等品和优等品的分级限值。适用于产品质量检测和等级评定，替代了旧版标准。
Key Sentences extracted from text
本标准规定了中、小功率柴油机用闭式喷油器总成（以下简称喷油器）的质量指标、试验方法、检验规则。
喷油器针阀开启压力按用户与制造厂协议规定，其极限偏差为1 0 + MPa。
喷油器的清洁度限值按表1 规定。
多缸柴油机上配套用的各个喷油器的流量值按用户与制造厂协议规定。
喷油器的可靠性和B50 极限寿命按表2 规定。
This standard specifies the quality indicators, test methods, and inspection rules for closed-type fuel injection nozzle assemblies (hereinafter referred to as injectors) for medium and small power diesel engines.
The injector needle valve opening pressure shall be as agreed between the user and the manufacturer, with a limit deviation of 1 0 + MPa.
The cleanliness limits of the injector are specified in Table 1.
The flow rate of each injector used in multi-cylinder diesel engines shall be as agreed between the user and the manufacturer.
The reliability and B50 ultimate life of the injector are specified in Table 2.
Standard Timeline
Changes from replaced version:
- 对喷油器中喷油嘴偶件的锥面密封性提出了更确切的要求
- 无故障可靠性时间，改为平均无故障间隔时间（MTBF）2000 h
- 喷油器清洁度限值及测定方法，按JB/T 7661—1995的规定
- More specific requirements for the cone sealing of the nozzle assembly in the injector
- Changed from trouble-free reliability time to mean time between failures (MTBF) of 2000 h
- Cleanliness limits and test methods for injectors according to JB/T 7661—1995