JB/T 51087-1999

Manufacturers and quality inspection agencies of tractors and internal combustion engines use this standard to grade and test spring tube pressure gauges. By defining two quality grades (qualified and first-class) and specifying detailed test methods and inspection rules, it ensures the reliability and consistency of pressure gauge products. This standard is crucial for the proper operation and safety of tractors and internal combustion engines.

拖拉机、内燃机制造商和质检机构使用该标准来对弹簧管式压力表进行质量分等和检测。该标准通过设定合格品和一等品两个等级，并规定详细的试验方法和检验规则，确保压力表产品的可靠性和一致性。它对于保障拖拉机、内燃机等设备的正常运行和安全至关重要。

This standard JB/T 51087-1999 specifies the product quality grading, test methods, and inspection rules for spring tube pressure gauges used in tractors and internal combustion engines. It classifies products into two grades: qualified and first-class. Detailed technical indicators are provided, including structural dimensions, appearance, basic error, hysteresis, light tap displacement, overload, temperature influence, vibration resistance, dustproofing, waterproofing, durability, damp heat cycling, and salt spray resistance. Test methods cover dimensional inspection, visual examination, and various performance tests. The inspection rules adopt the single normal sampling plan of GB/T 2828, with AQL values specified for different defect categories (A, B, C), along with specific sampling and judgment procedures. This standard applies to the quality inspection and grade evaluation of such pressure gauges.

本标准JB/T 51087-1999规定了拖拉机、内燃机用弹簧管式压力表的质量分等、试验方法和检验规则。标准将产品分为合格品和一等品两个等级，并详细列出了结构尺寸、外观、基本误差、来回差、轻敲位移、超负荷、温度影响、耐振动、防尘、防水、耐久性、交变湿热和耐盐雾等多项技术指标。试验方法包括结构尺寸检测、外观检查及各项性能试验。检验规则采用GB/T 2828的一次正常抽样方案，按不合格分类（A、B、C类）分别规定AQL值，并给出了具体的抽样和判定程序。该标准适用于此类压力表的质量检测和等级评定。