The standards for the dump valve automotive general requirements, performance requirements, test conditions, test equipment, test methods, the type test and factory testing, inspection rules and signs, packaging, transportation, storage.
This standard applies only to the hydraulic oil as the working media of self-unloading truck manually lifting systems, pneumatic and hydraulic valve (hereinafter referred to as valve).
2 reference standards
Dump Truck QC/T460 - hydraulic cylinder technology
Automotive paint coating QC/T484
Hydraulic system GB/T3766 General technical requirements
Sample count batches GB/T2828 inspection procedures and a sample table
3 General requirements
3.1 The valve should be in accordance with the provisions of the standards and procedures in accordance with approved drawings and technical documents to create.
3.2 All parts shall be subject to quality inspection departments to carry out inspection in order to pass the assembly.
3.3 Nominal pressure valve choice to follow the QC/T460 "Dump Truck - hydraulic cylinder technical conditions" of the relevant provisions.
3.4 feed valve, a combination of oil and other parts of the mouth should be taken to rust, dust and other protective measures. The rest of the surface coating QC/T484 in Table 1 according to the provisions of painting TQ6.
3.5 all the seals, dust-proof case in the assembly should be coated with thin oil or grease, and should ensure that seals are not damaged.
3.6 casting surface should be smooth, no sticky sand, cracks, burrs and other harmful defects.
3.7 valve should be cleaned before the assembly.
3.8 Manual control valve GB/T3766 force should meet the relevant requirements.
4 performance requirements
4.1 test run
Nominal pressure valve at rated flow conditions should be changed to the flexible and may not sound unusual, the direction of pressure on the conversion of oil should be accurate.
4.2 Pressure Loss
At rated flow conditions, the valve of the pressure loss of the channel shall not be greater than 0.3MPa.
Leakage within 4.3
Carried out with the leak test, valve leakage per minute shall not exceed the rated flow of 0.6%.
Note: leakage within the provisions of the value of the location work for any measurement of the mouth at the time of the sum of leakage.
Voltage of 4.4
Pressure tests conducted, the valve may not have broken, the drop, such as there shall be no anomaly.
Durability 4.5
Durability testing, should meet the requirements of 4.2 and 4.3.
5 experimental conditions
5.1 Temperature
Test test valve to enter the oil temperature is 50 ℃, allowing changes in the scope of its steady-state should be in accordance with the provisions of Table 1.
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