Hello, I'm performing some simulations of apump with a hydraulic accumulator. I don't understand clearly the results. In a closed loop, i connected a pump with a Valve in order to create a pressure drop. The results are a linear increase of the pressure in the circuit and the pressure drop is only created by the valve. Is the pressure increase realistic ? The pump efficiency is 100% I don't know how the pressure could increase with only a valve in the loop. I added a hydraulic accumulator at the entry of the pump and i have now a constant pressure of 1 bar. The accumulator has changed the behavior of the circuit, but i don't clearly understand why. Someone have an idea ? Thank's a lot.