1. The pressure difference between the inlet and outlet of the oil cavity is that the knuckles are fully opened. When the nominal flow rate is passed, the pressure difference between the valve and the oil cavity is generally about 1mpa. If the pressure difference is too low, the pressure reducing valve cannot compensate the pressure of the throttle valve, thus affecting the stability of the flow.
2. Flow adjustment range. Generally, the larger the flow adjustment range of the hydraulic press, the better, and when adjusting, the flow changes evenly and the adjustment performance is good.
3. Stable flow refers to the flow that the speed control valve can work normally, that is, the rate of change of the flow is not more than 10%, and there is no disconnection. QF type speed regulating valve and QDF type one-way throttle valve stable flow, generally about 10% of the nominal flow.
4. Internal leakage refers to the flow rate from the oil inlet cavity to the oil outlet cavity from the clearance between the valve core and the valve body when the throttle valve is fully closed and the oil inlet cavity pressure is adjusted to the nominal pressure. The internal leakage is required to be small. In addition, when the hydraulic press is working, the speed control valve is not easy to block. The flow through the valve is less affected by temperature.