What are the reasons for the failure of the speed control system of the 315-ton four-column hydraulic press?

1. The throttle of the throttle valve is blocked, resulting in small flow or unstable flow;

2. Speed control valve constant speed control valve spring is too soft, throttle valve before and after pressure difference is too small, resulting in speed control valve flow instability.

3. The pressure reducing valve in the speed regulating valve gets stuck, resulting in the pressure difference before and after the throttle valve changing with the external load.

4. The pressure reducing valve in the speed regulating 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 throttling speed control system of fixed pump, with large load change and high speed control precision, and sometimes used in volume adjustment speed control hydraulic system of variable pump oil supply. In the hydraulic system of fixed pump oil supply throttling control, it can be combined with pressure reducing valve to form a series of throttle valve and parallel throttle valve speed control loop.

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