Proportional electromagnetic control, 3 way, normally closed flow control, rotary hydraulic cartridge valve, suitable for post-compensation applications with load sensing systems. In a post-compensation system, the load sensing (port 1) of each HSPEC16-30 valve is connected to a high load, which maintains flow sharing when flow demand exceeds flow supply. The pressure compensation value of the valve is defined as the difference in pressure between the inlet and the load sensing port, and is either appropriately set by the pump load sensing control or provided by the additional pressure compensation valve, which is used throughout the system in case the pump is not adjustable