The use of the dump truck reversing pneumatic valve requirements

, this international standard specifies the dump truck with the general requirements of the reversing pneumatic valve, performance requirements, test conditions, test equipment, test method, type testing and factory test, inspection rules and signs, packaging, transportation and storage. This standard applies only to the hydraulic oil as working medium of automobile self-discharging system with manual, pneumatic and hydraulic explorers to the pneumatic valve ( Hereinafter referred to as the pneumatic valve. , reference standard: - QC/T dump truck The hydraulic cylinder technology conditions; QC/T car paint coating; GB/T hydraulic system common technical conditions; GB/T batch-by-batch inspection counter sampling procedures and sampling table. And general requirements: the reversing pneumatic valve shall comply with the provisions of this standard, and according to the prescribed procedures approved drawings and manufacturing technical documentation. All parts subject to quality inspection department inspection qualified rear can assembly. The choice of the nominal pressure pneumatic valve should refer to QC/T 'dump truck - 'The relevant provisions of the hydraulic cylinder technology conditions. Pneumatic valve oil outlet and inlet of the combining site, rustproof, dustproof and other protection measures should be taken. The rest of the surface coating paint as stipulated in the QC/T TQ in the table. All seals, dust on assembly should be coated with oil or thin layer of grease, and shall ensure that no damage to seal. Casting surface should be smooth, can not have harmful defect such as adhering sand, crack, burr. The reversing pneumatic valve should be cleaned before assembly. Manual operating force of pneumatic valve shall meet the requirements of GB/T. , performance requirements, test run, the reversing pneumatic valve under the condition of nominal pressure, nominal flow rate should be flexible, reversing not abnormal noise, pressure oil conversion direction should be accurate. The pressure loss: under the condition of rated flow, pneumatic valve of each channel shall not be greater than the pressure loss. MPa。 Across the internal leakage, leakage test, pneumatic valve leakage shall not exceed the rated flow per minute. %。 Note: e. work for any leakage position within the mouth the sum total of leakage measurement. Pressure resistance: during pressure test, pneumatic valve can not appear rupture, each part shall not appear abnormal phenomenon such as drip. Durability: after the durability test should be satisfied. And. Requirements.