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Reduce rate of flow od pump to increase Pressure in system hydraulic?

• Sir, I need help. I use the combustion - engine to drive a Variable displacement Piston Axis Pump. I know that P(Kw)=p(bar).Q(l/min). If i reduce flow of pump by changing the angle of yoke ,the pressure in system would increase (supposed that the power of engine is limit).i affraid that, if i do this, i will loss the energy of engine SO , the pressure in system increase, IS IT POSSIBLE ? thank for your answer

• Answer:

  The pressure in the system would not increase if you change the discharge by changing the yoke angle. Its most likely that it would decrease. In hydraulics, the liquid pressure depends upon the resistance to flow. So unless it changes the pressure does not change. Pressure will increase if you keep the yoke settings constant but change the flow using some flow control valve. In that case the resistance to flow will increase but at the same time pump would be delivering same amount of water. And as water cannot go elsewhere pressure would increase. This can damage your pump. If there is no resistance to flow there would be no pressure in the system. This does not happen in practice due to friction and viscosity. If you change the flow by changing the yoke, it is possible that your engine would try to run at higher speeds, if it has a good governor it will adjust the speed again with less fuel consumption.