一、速度控制系统出现故障的原因
1. The throttle of the throttle valve is blocked, resulting in a large flow or unstable flow;
2. The spring of the speed control valve is too soft, and the pressure difference between the front and rear of the throttle valve is too small, resulting in unstable flow of the speed control valve.
3. The pressure reducing valve in the speed regulating valve is stuck, causing the pressure difference before and after the throttle valve to change with the external load.
4. The pressure reducing valve in the speed control valve is stuck in the open position. When the load increases, the flow through the throttle valve decreases;
The advantage of hydraulic speed control valve is good flow stability, but the disadvantage is large pressure loss. It is often used in fixed pump throttle speed control system, with large load changes and high speed control accuracy, and sometimes used for variable pump oil supply volume adjustment speed hydraulic system. In the fixed pump oil supply throttle control hydraulic system, it can be combined with the pressure reducing valve to form a series of throttle valve and parallel throttle valve speed control circuit.
二、速度控制系统出现故障注意事项
1.液压调速阀不能反向使用，否则差压减压阀不能作为压力补偿器使用。
2.为了保证液压调速阀的正常运行，应注意调速阀的工作压差应大于阀的较小压差。 高压调速阀的较小压差通常为1MPa，中低压调速的较小压差通常为0.5MPa
3.调节流量后，应锁定手轮位置，以避免改变调节流量。
4.在较小稳定流量附近工作时，建议在系统中的速度控制阀入口侧安装一个管路过滤器，以避免阀门堵塞并影响流量的稳定性。
GEO-CANARY-86EA1707