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装载机在装配试机过程中，当转向盘转到极限位置时，有的机器会发出尖叫声。据现场判断，尖叫声来自装载机液压助力转向装置的恒流阀。更换恒流阀后尖叫声消失。 恒流阀的工作原理如图１所示，即当通过节流板２的油量变化而引起其两端压力变化时，通过恒流阀阀芯３的开闭来调节
Loader assembly machine test process, when the steering wheel to the limit position, some machines will issue a scream. Judging from the scene, the scream came from the constant flow valve of the hydraulic power steering of the loader. Replace the valve after the scream disappeared. The working principle of the constant flow valve shown in Figure 1, that is, when the pressure changes across the throttle plate caused by pressure changes at both ends, through the valve opening and closing to adjust the valve 3