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Pressure Independent Control Valve Technical manual

How do pressure independent control valves work?
By changing the open space through which the water flows within the valve, the flow rate can be adjusted and set.
The pressure across the seat of the PICV is held constant by the differential pressure controller.
Whilst setting, the open area around the disk will change resulting in a change to the flow rate.
How do I choose a PICV?
There are four key application requirements which are important when choosing a PICV: pipe size, design flow, pressure drop and control type.
The FlowCon design concept means that the valve body size is selected independently of design flow because each PICV insert fits in more than one valve size.
DRV generates higher pressure drop only and it can affect the start- up pressure.
No, you cannot.
Each PICV is designed to maintain the flow rate constant.
Each PICV needs at least the start-up differential pressure to work properly.

How do pressure independent control valves work?