GB/T 25367-2024 in English

GB/T25367-2024 Standard Overview

GB/T25367-2024, the national standard of the People's Republic of China, was issued in 2024, replacing the old version of GB/T25367-2010. This standard is mainly applicable to the design, manufacture and inspection of the electronic common rail system injector assembly for diesel engines.

Technical Requirements Interpretation

General Requirements

Common rail injectors must be manufactured in accordance with the approved product drawings and technical documents to ensure that the connection dimensions with the engine meet the user and manufacturer agreement.

Appearance Requirements

Common rail injectors should have a complete appearance, clear trademarks, and no defects such as rust or scratches. Special requirements need to be agreed upon with the user.

Sealing requirements

All sealing parts should not leak.

Opening pressure requirements

The opening pressure of the common rail injector is agreed upon by the user and the manufacturer, with a limit deviation of ±2MPa.

Fuel injection quantity deviation requirement

Formula (1): δ₁=(Qᵣ-Qᵣₙ)/Qᵣₙ×100%

Same group< b The single injection amount deviation of the common rail injector is calculated according to formula (2): δ=(Qmax - Qmin)/Qm ×100%.

Test method analysis

Appearance inspection

Use visual method to inspect the appearance of the common rail injector to ensure that there are no obvious defects.

Sealing test

Adjust the high-pressure fuel supply pump to the set speed on the special test bench and measure whether there is leakage in each sealing part.

Opening pressure test

Record the rail pressure value when the single injection amount drops to 1-2mm³, which is the opening pressure of the common rail injector.

Inspection rules and implementation suggestions

Type inspection

Type inspection is required when new products are put into production, materials or processes are changed, etc. to ensure stable product quality.

Factory inspection

Each product must pass the appearance, sealing, opening pressure and other items of inspection, and can only be shipped with a certificate of conformity.

Reliability test suggestions

It is recommended to conduct long-term reliability tests in actual use to ensure the stable performance of the < b>common rail injector under various working conditions.

Standard Background and Technology Evolution Analysis

GB/T25367-2010 mainly targets the specific requirements of diesel engine electronic common rail injection system, and the new version of the standard has made important improvements in the following aspects:

• Added appearance inspection method and sealing test requirements
• Adjusted the injection quantity deviation and return oil quantity test methods
• Optimized the reliability test process and evaluation rules
• Introduced stricter cleanliness control standards

Comparison Table (Table 1)

Implementation suggestions

Manufacturers should:

• Establish a sound quality control system to ensure that each product meets the standard requirements.
• Strengthen employee training to ensure that technical personnel are familiar with the changes in the new standard.
• Maintain close communication with users and promptly resolve technical problems encountered during application.