JB/T 51128-1999
Product quality grading of construction machinery hydraulic valve
Product quality grading of construction machinery hydraulic valve
Catalogue
Scope, References, Performance, Sealing, Test
Scope
Construction hydraulic parts production, factory inspection
Applicable to construction machinery hydraulic valve
Normative References
Keywords
Engineering hydraulic valve
directional control
leakage
pressure
grading
Application Summary AI generated
1. Three grades with stricter high-pressure leakage
2. Controls response speed and pressure stability
3. Includes high/low temperature and vibration test
4. Unified sampling rules.
Standard Timeline
replaces
51128.3-94
replaces
JB/T 51128.1
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Content extracted by AI. Not officially verified.