precision flow control valve

The main performance requirements of precision flow control valve:
When the pressure difference of the precision flow control valve is changed, the flow of the valve is small.
When the oil temperature changes, the flow rate is small.
The flow adjustment range is large, it is not easy to plug in the small flow, can get very small steady flow.
When the valve is fully open, the pressure loss of the valve is small.
Valve leakage is small.