JB/T 7926-1995 Technical Specifications for Hydraulic Quick-Change Connectors (for Agricultural Tractors and Implements) JB/T7926-1995 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Technical Conditions for Hydraulic Quick-Change Couplings
Agricultural tractors and machineryHydraulic quick-change couplings for general purposes-SpecificationsThis standard applies to quick-change couplings that transmit hydraulic power from tractors to agricultural machinery. 1. Installation position requirements
UDC 621-643.415
GB 5862—86
JB/7926-95
The female connector of the quick-change coupling should be installed above the upper hinge point of the tractor's suspension device. And as close as possible to the longitudinal axis of the tractor and the vertical plane passing through the upper hinge point. 2 Technical requirements
2.1 Quick-change joints with nominal diameters of 12.5mm and 20mm for agricultural tractors and implements shall meet the following requirements in addition to complying with the relevant provisions of GB5860-86 "Dimensions and requirements of hydraulic quick-change joints". 2.1.1 At a flow rate of 45L/min, the pressure drop through a quick-change joint with a nominal diameter of 12.5mm shall not exceed 350kPa (3.5bar). At a flow rate of 70L/min, the pressure drop through a quick-change joint with a nominal diameter of 20mm shall not exceed 172kPa (1.72bar). 2.1.2 When the internal pressure of the male joints with nominal diameters of 12.5mm and 20mm is zero, the force required to fully open the joint shall not exceed 45N. 2.1.3 When the quick-change joint is properly connected and the internal pressure is 17500kPa (175bar), the axial tension applied to the male joint of the quick-change joint does not exceed 1.7kN to disconnect the joint. When disconnected, the leakage of hydraulic oil for the connector with a nominal diameter of 12.5mm should not exceed 2.5mL, and the leakage of hydraulic oil for the connector with a nominal diameter of 20mm should not exceed 6mL. 2.2 If the installation method of the quick-change connector female connector is articulated, the maximum deflection angle of a certain axis parallel to the longitudinal axis of the tractor is 60. 2.3 If there is no limit device in the valve of the quick-change connector female connector, the spring force of the valve should be sufficient to prevent the valve in the male connector from closing under high-speed and high-flow conditions.
2.4 The connection force of the quick-change connector with an internal pressure of 700kPa (7bar) for a nominal diameter of 12.5mm and an internal pressure of 315kPa (3.15bar) for a nominal diameter of 20mm shall not exceed 240N. 2.5 To prevent pollutants from entering the system, the male connector and the female connector should be equipped with dustproof devices after the quick-change connector is separated. Additional notes: bZxz.net
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Chinese Academy of Agricultural Mechanization Sciences, Luoyang Mining Machinery Factory and Luoyang Tractor Research Institute. The main drafter of this standard is Shang Dong.
Issued by the National Bureau of Standards on February 17, 1986
Implementation on November 1, 1986
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